Muhammad sani idris | NASARAWA STATE UNIVERSITY, KEFFI, NASARAWA STATE-NIGERIA (original) (raw)

Papers by Muhammad sani idris

Energies

In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial te... more In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial technology for the future of automotive power systems. The EV has become a top priority of major global car manufacturers and is expected to disrupt the road transportation sector. In Malaysia and Indonesia, EVs just started as an important force. However, in Malaysia, the lack of EV infrastructure, along with its strong dependency on fossil fuels, poses an enormous challenge. The situation is very similar in Indonesia. Indonesia has huge potential as Southeast Asia’s largest vehicle market and a major nickel producer, an important EV battery ingredient. Therefore, this article addresses several critical issues in implementing EVs in Malaysia and Indonesia. In preparing this review, we have thoroughly selected very important EV keywords that are frequently asked. We have also interviewed some prominent figures in the field of EV to address the most critical aspects worth including in the p...

Energies

In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial te... more In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial technology for the future of automotive power systems. The EV has become a top priority of major global car manufacturers and is expected to disrupt the road transportation sector. In Malaysia and Indonesia, EVs just started as an important force. However, in Malaysia, the lack of EV infrastructure, along with its strong dependency on fossil fuels, poses an enormous challenge. The situation is very similar in Indonesia. Indonesia has huge potential as Southeast Asia’s largest vehicle market and a major nickel producer, an important EV battery ingredient. Therefore, this article addresses several critical issues in implementing EVs in Malaysia and Indonesia. In preparing this review, we have thoroughly selected very important EV keywords that are frequently asked. We have also interviewed some prominent figures in the field of EV to address the most critical aspects worth including in the p...

Jurnal al-Hikmah, Feb 17, 2021

Jurnal al-Hikmah, Feb 17, 2021

Materials Chemistry and Physics, 2021

Materials Chemistry and Physics, 2021

Applied Physics A, 2020

MgO thin films were spin coated on aluminum (Al) substrate and used between LED package and heat ... more MgO thin films were spin coated on aluminum (Al) substrate and used between LED package and heat sink as thin-film heat spreader. Crystallographic studies showed the presence of (111), (200) and (220) orientations related to MgO phases. From the XRD analysis, 10-layers of MgO showed a favorable film thickness (424 nm), crystal size (11.6 nm), microstrain (0.4860 nm) and dislocation density (0.0078 lines/m2). Similarly, low surface roughness (14.6 nm) and depth of peak–valley (71.6 nm) were recorded from 10-layers MgO thin film using Atomic Force Microscopy (AFM) analysis. Relative thermal conductivity of 22.93 W/mK was recorded from the 10-layers MgO film. High value of the difference in total thermal resistance (ΔRth-tot = 3.01 K/W) and rise in junction temperature (ΔTJ = 18.92 °C) were recorded along with good thermal impedance (35 °C) from the 10-layers MgO thin film measured at 700 mA using thermal transient analysis. Overall, MgO thin film coated Al substrates showed an improved performance for the tested LED and, therefore, can be considered as an alternative thermal substrate for LED thermal management.

Applied Physics A, 2020

MgO thin films were spin coated on aluminum (Al) substrate and used between LED package and heat ... more MgO thin films were spin coated on aluminum (Al) substrate and used between LED package and heat sink as thin-film heat spreader. Crystallographic studies showed the presence of (111), (200) and (220) orientations related to MgO phases. From the XRD analysis, 10-layers of MgO showed a favorable film thickness (424 nm), crystal size (11.6 nm), microstrain (0.4860 nm) and dislocation density (0.0078 lines/m2). Similarly, low surface roughness (14.6 nm) and depth of peak–valley (71.6 nm) were recorded from 10-layers MgO thin film using Atomic Force Microscopy (AFM) analysis. Relative thermal conductivity of 22.93 W/mK was recorded from the 10-layers MgO film. High value of the difference in total thermal resistance (ΔRth-tot = 3.01 K/W) and rise in junction temperature (ΔTJ = 18.92 °C) were recorded along with good thermal impedance (35 °C) from the 10-layers MgO thin film measured at 700 mA using thermal transient analysis. Overall, MgO thin film coated Al substrates showed an improved performance for the tested LED and, therefore, can be considered as an alternative thermal substrate for LED thermal management.

The study aims to study and analyze the impact of job satisfaction, motivation of work and organi... more The study aims to study and analyze the impact of job satisfaction, motivation of work and organizational commitment to employee performance. Population and sample are all 32 employees. Data collection through questionnaire distribution. Analysis of the data in this study using SPSS version 16. The sampling technique using the census method and the data testing technique used in this research includes validity testing, reliability testing, classical hypothesis testing, multiple linear regression analysis, and hypothesis testing research.The results of the analysis show that the outline of job satifaction affects the significance of employee performance on motivattion of work that significantly influence employee performance as well as on organizational commitment has a significant effect. Together, it shows that job satisfaction , motivattion of work and organizational commitment significantly influence employee performance. Keywords: Job satisfaction, Motivattion of Work and Organ...

The study aims to study and analyze the impact of job satisfaction, motivation of work and organi... more The study aims to study and analyze the impact of job satisfaction, motivation of work and organizational commitment to employee performance. Population and sample are all 32 employees. Data collection through questionnaire distribution. Analysis of the data in this study using SPSS version 16. The sampling technique using the census method and the data testing technique used in this research includes validity testing, reliability testing, classical hypothesis testing, multiple linear regression analysis, and hypothesis testing research.The results of the analysis show that the outline of job satifaction affects the significance of employee performance on motivattion of work that significantly influence employee performance as well as on organizational commitment has a significant effect. Together, it shows that job satisfaction , motivattion of work and organizational commitment significantly influence employee performance. Keywords: Job satisfaction, Motivattion of Work and Organ...

Journal of Materials Science: Materials in Electronics, 2021

Monolithic MgO and multilayer MgO/ZnO thin film was spin coated on Cu substrates. XRD analysis wa... more Monolithic MgO and multilayer MgO/ZnO thin film was spin coated on Cu substrates. XRD analysis was used to study the structural properties of the coated films. AFM and FESEM tilt image analysis was used to explore the importance of low surface roughness in heat dissipation. Results from the analysis showed low surface roughness (2.6 nm) and least peak–valley distance (1.2 nm) were recorded for 6:4 L/MgO/ZnO sample. Similarly, a significance high thermal resistance difference (Δ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta$$\end{document} Rth-tot = 3.18 K/W) at 700 mA was also recorded with 6:4 L/MgO/ZnO boundary condition. Further improved heat distribution, optimal optical performance, and lowest LED surface temperature during operation were noticed for the LED mounted on 6:4 L/MgO/ZnO solid thin film TIM cum heat spreader, and this happened to be good compared to those recorded for bare Cu substrate boundary (air interface). Overall, the performance of the MgO/ZnO solid thin film proves it suitability as an alternative interface material in electronic and lighting packaging applications.

Journal of Materials Science: Materials in Electronics, 2021

Monolithic MgO and multilayer MgO/ZnO thin film was spin coated on Cu substrates. XRD analysis wa... more Monolithic MgO and multilayer MgO/ZnO thin film was spin coated on Cu substrates. XRD analysis was used to study the structural properties of the coated films. AFM and FESEM tilt image analysis was used to explore the importance of low surface roughness in heat dissipation. Results from the analysis showed low surface roughness (2.6 nm) and least peak–valley distance (1.2 nm) were recorded for 6:4 L/MgO/ZnO sample. Similarly, a significance high thermal resistance difference (Δ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta$$\end{document} Rth-tot = 3.18 K/W) at 700 mA was also recorded with 6:4 L/MgO/ZnO boundary condition. Further improved heat distribution, optimal optical performance, and lowest LED surface temperature during operation were noticed for the LED mounted on 6:4 L/MgO/ZnO solid thin film TIM cum heat spreader, and this happened to be good compared to those recorded for bare Cu substrate boundary (air interface). Overall, the performance of the MgO/ZnO solid thin film proves it suitability as an alternative interface material in electronic and lighting packaging applications.

Journal of Materials Science: Materials in Electronics, 2020

Towards improving structural, surface, and thermal properties of MgO heat spreader, ZnO thin film... more Towards improving structural, surface, and thermal properties of MgO heat spreader, ZnO thin film was interstacked into MgO. This would improve heat dissipation and keeping the temperature as well as the junction temperature of LEDs in safe operating conditions and make the MgO/ZnO multilayer thin film as a reliable heat spreader material in thermal management application. XRD measurements, FESEM, and AFM analysis were employed in examining the structure, morphology, particle size, and topography of the spin-coated monolithic MgO and multilayer MgO/ZnO thin films, respectively. Improvement in crystal size, reduction in residual stress, lattice strain, and dislocation density were recorded for MgO/ZnO multilayer films. Similarly, introduction of ZnO into MgO resulted an improvement in surface morphology with large particle size (76 nm) and decrease in surface roughness from 19.1 to 9.6 nm. From thermal transient analysis, a noticeable difference in junction temperature raise ( ΔT J = 27.07 °C) and high difference in total thermal resistance ( ΔR th-tot = 5.3 K/W) were recorded for LED fixed on 6:4 L MgO:ZnO thin film-coated aluminum substrate. Introduction of ZnO into MgO improves the structure and surface qualities as well as thermal performance of MgO thin film and LEDs mounted on them. The optimized multilayer MgO/ZnO ceramic-ceramic composite thin film could be employed for efficient, reliable, and longer life LEDs thermal management as heat spreader.

Journal of Materials Science: Materials in Electronics, 2020

Towards improving structural, surface, and thermal properties of MgO heat spreader, ZnO thin film... more Towards improving structural, surface, and thermal properties of MgO heat spreader, ZnO thin film was interstacked into MgO. This would improve heat dissipation and keeping the temperature as well as the junction temperature of LEDs in safe operating conditions and make the MgO/ZnO multilayer thin film as a reliable heat spreader material in thermal management application. XRD measurements, FESEM, and AFM analysis were employed in examining the structure, morphology, particle size, and topography of the spin-coated monolithic MgO and multilayer MgO/ZnO thin films, respectively. Improvement in crystal size, reduction in residual stress, lattice strain, and dislocation density were recorded for MgO/ZnO multilayer films. Similarly, introduction of ZnO into MgO resulted an improvement in surface morphology with large particle size (76 nm) and decrease in surface roughness from 19.1 to 9.6 nm. From thermal transient analysis, a noticeable difference in junction temperature raise ( ΔT J = 27.07 °C) and high difference in total thermal resistance ( ΔR th-tot = 5.3 K/W) were recorded for LED fixed on 6:4 L MgO:ZnO thin film-coated aluminum substrate. Introduction of ZnO into MgO improves the structure and surface qualities as well as thermal performance of MgO thin film and LEDs mounted on them. The optimized multilayer MgO/ZnO ceramic-ceramic composite thin film could be employed for efficient, reliable, and longer life LEDs thermal management as heat spreader.

4′,5,7-Trihydroxy-3′-prenylflavanone was synthesized and tested for antibacterial effects aga... more 4′,5,7-Trihydroxy-3′-prenylflavanone was synthesized and tested for antibacterial effects against Bacillus subtilis, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The synthesized compounds were characterized using UV, IR, MS and 1H and 13C NMR data. The antibacterial screening of the synthesized compounds were performed in vitro by the filter paper disc diffusion method.

4′,5,7-Trihydroxy-3′-prenylflavanone was synthesized and tested for antibacterial effects aga... more 4′,5,7-Trihydroxy-3′-prenylflavanone was synthesized and tested for antibacterial effects against Bacillus subtilis, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The synthesized compounds were characterized using UV, IR, MS and 1H and 13C NMR data. The antibacterial screening of the synthesized compounds were performed in vitro by the filter paper disc diffusion method.

Buku Kimia Organik: Kumpulan Berfungsi ditulis khusus untuk semua yang memerlukan pengetahuan asa... more Buku Kimia Organik: Kumpulan Berfungsi ditulis khusus untuk semua yang memerlukan pengetahuan asas kimia organik sebagai tahap permulaan dalam bidang sains khususnya kimia, biokimia, dan biologi, kejuruteraan kimia, dan farmasi. Buku ini mengandungi sepuluh bab, memperkenalkan pengelasan sebatian organik mengikut kumpulan berfungsi, iaitu bahagian yang mencirikan sebatian organik yang terlibat dalam semua tindak balas. Setiap bab dilengkapi dengan pengenalan, sifat penamaan, penyediaan, tindak balas berserta mekanisme tindak balas, contoh soalan serta penyelesaian, ringkasan dan soalan latihan. Buku ini menekankan pemahaman kaitan antara satu kumpulan berfungsi dengan kumpulan berfungsi yang lain. Hidrokarbon merupakan rangka asas kepada semua sebatian organik. Pengikatan kumpulan berfungsi, hidroksil, karbonil, halogen dan amino kepada rangka hidrokarbon memberikan sebatian organik dengan kelas tertentu, iaitu alkohol, fenol, aldehid, keton, amina, asid karboksilik dan terbitan asid karboksilik. Di samping itu, pengubahsuaian satu kumpulan berfungsi kepada kumpulan berfungsi lain menggunakan reagen tertentu dibantu dengan mekanisme tindak balas untuk memahamkan konsep tindak balas kimia organik.

Buku Kimia Organik: Kumpulan Berfungsi ditulis khusus untuk semua yang memerlukan pengetahuan asa... more Buku Kimia Organik: Kumpulan Berfungsi ditulis khusus untuk semua yang memerlukan pengetahuan asas kimia organik sebagai tahap permulaan dalam bidang sains khususnya kimia, biokimia, dan biologi, kejuruteraan kimia, dan farmasi. Buku ini mengandungi sepuluh bab, memperkenalkan pengelasan sebatian organik mengikut kumpulan berfungsi, iaitu bahagian yang mencirikan sebatian organik yang terlibat dalam semua tindak balas. Setiap bab dilengkapi dengan pengenalan, sifat penamaan, penyediaan, tindak balas berserta mekanisme tindak balas, contoh soalan serta penyelesaian, ringkasan dan soalan latihan. Buku ini menekankan pemahaman kaitan antara satu kumpulan berfungsi dengan kumpulan berfungsi yang lain. Hidrokarbon merupakan rangka asas kepada semua sebatian organik. Pengikatan kumpulan berfungsi, hidroksil, karbonil, halogen dan amino kepada rangka hidrokarbon memberikan sebatian organik dengan kelas tertentu, iaitu alkohol, fenol, aldehid, keton, amina, asid karboksilik dan terbitan asid karboksilik. Di samping itu, pengubahsuaian satu kumpulan berfungsi kepada kumpulan berfungsi lain menggunakan reagen tertentu dibantu dengan mekanisme tindak balas untuk memahamkan konsep tindak balas kimia organik.

Energies

In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial te... more In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial technology for the future of automotive power systems. The EV has become a top priority of major global car manufacturers and is expected to disrupt the road transportation sector. In Malaysia and Indonesia, EVs just started as an important force. However, in Malaysia, the lack of EV infrastructure, along with its strong dependency on fossil fuels, poses an enormous challenge. The situation is very similar in Indonesia. Indonesia has huge potential as Southeast Asia’s largest vehicle market and a major nickel producer, an important EV battery ingredient. Therefore, this article addresses several critical issues in implementing EVs in Malaysia and Indonesia. In preparing this review, we have thoroughly selected very important EV keywords that are frequently asked. We have also interviewed some prominent figures in the field of EV to address the most critical aspects worth including in the p...

Energies

In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial te... more In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial technology for the future of automotive power systems. The EV has become a top priority of major global car manufacturers and is expected to disrupt the road transportation sector. In Malaysia and Indonesia, EVs just started as an important force. However, in Malaysia, the lack of EV infrastructure, along with its strong dependency on fossil fuels, poses an enormous challenge. The situation is very similar in Indonesia. Indonesia has huge potential as Southeast Asia’s largest vehicle market and a major nickel producer, an important EV battery ingredient. Therefore, this article addresses several critical issues in implementing EVs in Malaysia and Indonesia. In preparing this review, we have thoroughly selected very important EV keywords that are frequently asked. We have also interviewed some prominent figures in the field of EV to address the most critical aspects worth including in the p...

Jurnal al-Hikmah, Feb 17, 2021

Jurnal al-Hikmah, Feb 17, 2021

Materials Chemistry and Physics, 2021

Materials Chemistry and Physics, 2021

Applied Physics A, 2020

MgO thin films were spin coated on aluminum (Al) substrate and used between LED package and heat ... more MgO thin films were spin coated on aluminum (Al) substrate and used between LED package and heat sink as thin-film heat spreader. Crystallographic studies showed the presence of (111), (200) and (220) orientations related to MgO phases. From the XRD analysis, 10-layers of MgO showed a favorable film thickness (424 nm), crystal size (11.6 nm), microstrain (0.4860 nm) and dislocation density (0.0078 lines/m2). Similarly, low surface roughness (14.6 nm) and depth of peak–valley (71.6 nm) were recorded from 10-layers MgO thin film using Atomic Force Microscopy (AFM) analysis. Relative thermal conductivity of 22.93 W/mK was recorded from the 10-layers MgO film. High value of the difference in total thermal resistance (ΔRth-tot = 3.01 K/W) and rise in junction temperature (ΔTJ = 18.92 °C) were recorded along with good thermal impedance (35 °C) from the 10-layers MgO thin film measured at 700 mA using thermal transient analysis. Overall, MgO thin film coated Al substrates showed an improved performance for the tested LED and, therefore, can be considered as an alternative thermal substrate for LED thermal management.

Applied Physics A, 2020

MgO thin films were spin coated on aluminum (Al) substrate and used between LED package and heat ... more MgO thin films were spin coated on aluminum (Al) substrate and used between LED package and heat sink as thin-film heat spreader. Crystallographic studies showed the presence of (111), (200) and (220) orientations related to MgO phases. From the XRD analysis, 10-layers of MgO showed a favorable film thickness (424 nm), crystal size (11.6 nm), microstrain (0.4860 nm) and dislocation density (0.0078 lines/m2). Similarly, low surface roughness (14.6 nm) and depth of peak–valley (71.6 nm) were recorded from 10-layers MgO thin film using Atomic Force Microscopy (AFM) analysis. Relative thermal conductivity of 22.93 W/mK was recorded from the 10-layers MgO film. High value of the difference in total thermal resistance (ΔRth-tot = 3.01 K/W) and rise in junction temperature (ΔTJ = 18.92 °C) were recorded along with good thermal impedance (35 °C) from the 10-layers MgO thin film measured at 700 mA using thermal transient analysis. Overall, MgO thin film coated Al substrates showed an improved performance for the tested LED and, therefore, can be considered as an alternative thermal substrate for LED thermal management.

The study aims to study and analyze the impact of job satisfaction, motivation of work and organi... more The study aims to study and analyze the impact of job satisfaction, motivation of work and organizational commitment to employee performance. Population and sample are all 32 employees. Data collection through questionnaire distribution. Analysis of the data in this study using SPSS version 16. The sampling technique using the census method and the data testing technique used in this research includes validity testing, reliability testing, classical hypothesis testing, multiple linear regression analysis, and hypothesis testing research.The results of the analysis show that the outline of job satifaction affects the significance of employee performance on motivattion of work that significantly influence employee performance as well as on organizational commitment has a significant effect. Together, it shows that job satisfaction , motivattion of work and organizational commitment significantly influence employee performance. Keywords: Job satisfaction, Motivattion of Work and Organ...

The study aims to study and analyze the impact of job satisfaction, motivation of work and organi... more The study aims to study and analyze the impact of job satisfaction, motivation of work and organizational commitment to employee performance. Population and sample are all 32 employees. Data collection through questionnaire distribution. Analysis of the data in this study using SPSS version 16. The sampling technique using the census method and the data testing technique used in this research includes validity testing, reliability testing, classical hypothesis testing, multiple linear regression analysis, and hypothesis testing research.The results of the analysis show that the outline of job satifaction affects the significance of employee performance on motivattion of work that significantly influence employee performance as well as on organizational commitment has a significant effect. Together, it shows that job satisfaction , motivattion of work and organizational commitment significantly influence employee performance. Keywords: Job satisfaction, Motivattion of Work and Organ...

Journal of Materials Science: Materials in Electronics, 2021

Monolithic MgO and multilayer MgO/ZnO thin film was spin coated on Cu substrates. XRD analysis wa... more Monolithic MgO and multilayer MgO/ZnO thin film was spin coated on Cu substrates. XRD analysis was used to study the structural properties of the coated films. AFM and FESEM tilt image analysis was used to explore the importance of low surface roughness in heat dissipation. Results from the analysis showed low surface roughness (2.6 nm) and least peak–valley distance (1.2 nm) were recorded for 6:4 L/MgO/ZnO sample. Similarly, a significance high thermal resistance difference (Δ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta$$\end{document} Rth-tot = 3.18 K/W) at 700 mA was also recorded with 6:4 L/MgO/ZnO boundary condition. Further improved heat distribution, optimal optical performance, and lowest LED surface temperature during operation were noticed for the LED mounted on 6:4 L/MgO/ZnO solid thin film TIM cum heat spreader, and this happened to be good compared to those recorded for bare Cu substrate boundary (air interface). Overall, the performance of the MgO/ZnO solid thin film proves it suitability as an alternative interface material in electronic and lighting packaging applications.

Journal of Materials Science: Materials in Electronics, 2021

Monolithic MgO and multilayer MgO/ZnO thin film was spin coated on Cu substrates. XRD analysis wa... more Monolithic MgO and multilayer MgO/ZnO thin film was spin coated on Cu substrates. XRD analysis was used to study the structural properties of the coated films. AFM and FESEM tilt image analysis was used to explore the importance of low surface roughness in heat dissipation. Results from the analysis showed low surface roughness (2.6 nm) and least peak–valley distance (1.2 nm) were recorded for 6:4 L/MgO/ZnO sample. Similarly, a significance high thermal resistance difference (Δ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta$$\end{document} Rth-tot = 3.18 K/W) at 700 mA was also recorded with 6:4 L/MgO/ZnO boundary condition. Further improved heat distribution, optimal optical performance, and lowest LED surface temperature during operation were noticed for the LED mounted on 6:4 L/MgO/ZnO solid thin film TIM cum heat spreader, and this happened to be good compared to those recorded for bare Cu substrate boundary (air interface). Overall, the performance of the MgO/ZnO solid thin film proves it suitability as an alternative interface material in electronic and lighting packaging applications.

Journal of Materials Science: Materials in Electronics, 2020

Towards improving structural, surface, and thermal properties of MgO heat spreader, ZnO thin film... more Towards improving structural, surface, and thermal properties of MgO heat spreader, ZnO thin film was interstacked into MgO. This would improve heat dissipation and keeping the temperature as well as the junction temperature of LEDs in safe operating conditions and make the MgO/ZnO multilayer thin film as a reliable heat spreader material in thermal management application. XRD measurements, FESEM, and AFM analysis were employed in examining the structure, morphology, particle size, and topography of the spin-coated monolithic MgO and multilayer MgO/ZnO thin films, respectively. Improvement in crystal size, reduction in residual stress, lattice strain, and dislocation density were recorded for MgO/ZnO multilayer films. Similarly, introduction of ZnO into MgO resulted an improvement in surface morphology with large particle size (76 nm) and decrease in surface roughness from 19.1 to 9.6 nm. From thermal transient analysis, a noticeable difference in junction temperature raise ( ΔT J = 27.07 °C) and high difference in total thermal resistance ( ΔR th-tot = 5.3 K/W) were recorded for LED fixed on 6:4 L MgO:ZnO thin film-coated aluminum substrate. Introduction of ZnO into MgO improves the structure and surface qualities as well as thermal performance of MgO thin film and LEDs mounted on them. The optimized multilayer MgO/ZnO ceramic-ceramic composite thin film could be employed for efficient, reliable, and longer life LEDs thermal management as heat spreader.

Journal of Materials Science: Materials in Electronics, 2020

Towards improving structural, surface, and thermal properties of MgO heat spreader, ZnO thin film... more Towards improving structural, surface, and thermal properties of MgO heat spreader, ZnO thin film was interstacked into MgO. This would improve heat dissipation and keeping the temperature as well as the junction temperature of LEDs in safe operating conditions and make the MgO/ZnO multilayer thin film as a reliable heat spreader material in thermal management application. XRD measurements, FESEM, and AFM analysis were employed in examining the structure, morphology, particle size, and topography of the spin-coated monolithic MgO and multilayer MgO/ZnO thin films, respectively. Improvement in crystal size, reduction in residual stress, lattice strain, and dislocation density were recorded for MgO/ZnO multilayer films. Similarly, introduction of ZnO into MgO resulted an improvement in surface morphology with large particle size (76 nm) and decrease in surface roughness from 19.1 to 9.6 nm. From thermal transient analysis, a noticeable difference in junction temperature raise ( ΔT J = 27.07 °C) and high difference in total thermal resistance ( ΔR th-tot = 5.3 K/W) were recorded for LED fixed on 6:4 L MgO:ZnO thin film-coated aluminum substrate. Introduction of ZnO into MgO improves the structure and surface qualities as well as thermal performance of MgO thin film and LEDs mounted on them. The optimized multilayer MgO/ZnO ceramic-ceramic composite thin film could be employed for efficient, reliable, and longer life LEDs thermal management as heat spreader.

4′,5,7-Trihydroxy-3′-prenylflavanone was synthesized and tested for antibacterial effects aga... more 4′,5,7-Trihydroxy-3′-prenylflavanone was synthesized and tested for antibacterial effects against Bacillus subtilis, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The synthesized compounds were characterized using UV, IR, MS and 1H and 13C NMR data. The antibacterial screening of the synthesized compounds were performed in vitro by the filter paper disc diffusion method.

4′,5,7-Trihydroxy-3′-prenylflavanone was synthesized and tested for antibacterial effects aga... more 4′,5,7-Trihydroxy-3′-prenylflavanone was synthesized and tested for antibacterial effects against Bacillus subtilis, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The synthesized compounds were characterized using UV, IR, MS and 1H and 13C NMR data. The antibacterial screening of the synthesized compounds were performed in vitro by the filter paper disc diffusion method.

Buku Kimia Organik: Kumpulan Berfungsi ditulis khusus untuk semua yang memerlukan pengetahuan asa... more Buku Kimia Organik: Kumpulan Berfungsi ditulis khusus untuk semua yang memerlukan pengetahuan asas kimia organik sebagai tahap permulaan dalam bidang sains khususnya kimia, biokimia, dan biologi, kejuruteraan kimia, dan farmasi. Buku ini mengandungi sepuluh bab, memperkenalkan pengelasan sebatian organik mengikut kumpulan berfungsi, iaitu bahagian yang mencirikan sebatian organik yang terlibat dalam semua tindak balas. Setiap bab dilengkapi dengan pengenalan, sifat penamaan, penyediaan, tindak balas berserta mekanisme tindak balas, contoh soalan serta penyelesaian, ringkasan dan soalan latihan. Buku ini menekankan pemahaman kaitan antara satu kumpulan berfungsi dengan kumpulan berfungsi yang lain. Hidrokarbon merupakan rangka asas kepada semua sebatian organik. Pengikatan kumpulan berfungsi, hidroksil, karbonil, halogen dan amino kepada rangka hidrokarbon memberikan sebatian organik dengan kelas tertentu, iaitu alkohol, fenol, aldehid, keton, amina, asid karboksilik dan terbitan asid karboksilik. Di samping itu, pengubahsuaian satu kumpulan berfungsi kepada kumpulan berfungsi lain menggunakan reagen tertentu dibantu dengan mekanisme tindak balas untuk memahamkan konsep tindak balas kimia organik.

Buku Kimia Organik: Kumpulan Berfungsi ditulis khusus untuk semua yang memerlukan pengetahuan asa... more Buku Kimia Organik: Kumpulan Berfungsi ditulis khusus untuk semua yang memerlukan pengetahuan asas kimia organik sebagai tahap permulaan dalam bidang sains khususnya kimia, biokimia, dan biologi, kejuruteraan kimia, dan farmasi. Buku ini mengandungi sepuluh bab, memperkenalkan pengelasan sebatian organik mengikut kumpulan berfungsi, iaitu bahagian yang mencirikan sebatian organik yang terlibat dalam semua tindak balas. Setiap bab dilengkapi dengan pengenalan, sifat penamaan, penyediaan, tindak balas berserta mekanisme tindak balas, contoh soalan serta penyelesaian, ringkasan dan soalan latihan. Buku ini menekankan pemahaman kaitan antara satu kumpulan berfungsi dengan kumpulan berfungsi yang lain. Hidrokarbon merupakan rangka asas kepada semua sebatian organik. Pengikatan kumpulan berfungsi, hidroksil, karbonil, halogen dan amino kepada rangka hidrokarbon memberikan sebatian organik dengan kelas tertentu, iaitu alkohol, fenol, aldehid, keton, amina, asid karboksilik dan terbitan asid karboksilik. Di samping itu, pengubahsuaian satu kumpulan berfungsi kepada kumpulan berfungsi lain menggunakan reagen tertentu dibantu dengan mekanisme tindak balas untuk memahamkan konsep tindak balas kimia organik.