Phan Duc Minh - Academia.edu (original) (raw)

Papers by Phan Duc Minh

Research paper thumbnail of Simulation of Heat Dissipation for High Power Electronic Component using Carbon Nanotube Nanofluids

Carbon nanotubes(CNTs) aresomeof most valuable materials that have highest thermal conductivity.T... more Carbon nanotubes(CNTs) aresomeof most valuable materials that have highest thermal conductivity.The thermal conductivity of individual carbon nanotubes is 2000 Wm −1 K −1 compared with the thermal conductivity 419 Wm −1 K −1 of silver.Therefore, carbon nanotubes have opened a new way for heat dissipation for high power electronic components, such as micro-processor, high brightness LED, etc. In this paper, we present the simulation results on heat dissipation for a high power electronic component using carbon nanotube nanofluids.

Research paper thumbnail of Miniaturized, highly sensitive single-chip multichannel quartz-crystal microbalance

Applied Physics Letters, Dec 22, 2002

A miniaturized highly sensitive single-chip multichannel quartz-crystal microbalance prepared by ... more A miniaturized highly sensitive single-chip multichannel quartz-crystal microbalance prepared by deep reactive ion etching is presented. In the present work, quartz resonators in a single-chip with the diameters in the range 0.05-1.0 mm and thicknesses in the range 18-82 μm were fabricated. The conductance measurements carried out on the resonators showed that the Q factor is inversely proportional to resonator thickness. The Q-factor value as high as ˜30 000 has been observed in case of a 94 MHz resonator whose diameter is 1 mm and the thickness 17.8 μm. The Q factor of a resonator of very small diameter (0.1 mm) reached the value 5700.

Research paper thumbnail of Field electron emission from free-standing flexible PDMS-supported carbon-nanotube-array films

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2008

Fabrication of free-standing carbon-nanotube-(CNT) array films supported by PDMS (poly-dimethylsi... more Fabrication of free-standing carbon-nanotube-(CNT) array films supported by PDMS (poly-dimethylsiloxane) matrix, which opens up the possibility to transform deliberate CNT-array architecture into flexible electronic and photonic components, is reported. Low viscosity ...

Research paper thumbnail of Two new oleanane-type triterpene saponins from the leaves of Schefflera sessiliflora De P. V

Phytochemistry Letters, 2015

Research paper thumbnail of Carbon nanotube integrated on silicon tips for electron field emitter: tip apex patterning and emission characterization

TRANSDUCERS '03. 12th International Conference on Solid-State Sensors, Actuators and Microsystems. Digest of Technical Papers (Cat. No.03TH8664), 2003

Keywords: Carbon hanotuhe, Electron field emitte6 Tip apex patterning technique, Hot filament che... more Keywords: Carbon hanotuhe, Electron field emitte6 Tip apex patterning technique, Hot filament chemical vapor deposition. ... Electron field emission or cold emitter, where electron beam is emitted from a sharp tip under a strong electric field, have been paid much attention in ...

Research paper thumbnail of Carbon nanotube integrated on silicon tips for electron field emitter: tip apex patterning and emission characterization

TRANSDUCERS '03. 12th International Conference on Solid-State Sensors, Actuators and Microsystems. Digest of Technical Papers (Cat. No.03TH8664), 2003

Keywords: Carbon hanotuhe, Electron field emitte6 Tip apex patterning technique, Hot filament che... more Keywords: Carbon hanotuhe, Electron field emitte6 Tip apex patterning technique, Hot filament chemical vapor deposition. ... Electron field emission or cold emitter, where electron beam is emitted from a sharp tip under a strong electric field, have been paid much attention in ...

Research paper thumbnail of Flexible CNT-array cathodes: Effect of bending on field electron emission

2009 22nd International Vacuum Nanoelectronics Conference, 2009

In this work, we report results showing a correlation between the curvature of PDMS-supported CNT... more In this work, we report results showing a correlation between the curvature of PDMS-supported CNT-tip arrays and their emission properties. CNTs were produced by using a hot-filament chemical-vapor-deposition (HFCVD) setup. VA-CNTs were synthesized using 28-Torr mixtures of methane (20 SCCM) and hydrogen (30 SCCM) as feedstock. Temperatures of filaments and substrates were 2050 and 750 degC, respectively. In order to

Research paper thumbnail of Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes

Nature Communications, 2013

The optical properties of single-wall carbon nanotubes are very promising for developing novel op... more The optical properties of single-wall carbon nanotubes are very promising for developing novel opto-electronic components and sensors with applications in many fields. Despite numerous studies performed using photoluminescence or Raman and Rayleigh scattering, knowledge of their optical response is still partial. Here we determine using spatial modulation spectroscopy, over a broad optical spectral range, the spectrum and amplitude of the absorption cross-section of individual semiconducting single-wall carbon nanotubes. These quantitative measurements permit determination of the oscillator strength of the different excitonic resonances and their dependencies on the excitonic transition and type of semiconducting nanotube. A non-resonant background is also identified and its cross-section comparable to the ideal graphene optical absorbance. Furthermore, investigation of the same single-wall nanotube either free standing or lying on a substrate shows large broadening of the excitonic resonances with increase of oscillator strength, as well as stark weakening of polarization-dependent antenna effects, due to nanotube-substrate interaction.

Research paper thumbnail of Utilization of carbon nanotube and diamond for electron field emission devices

17th IEEE International Conference on Micro Electro Mechanical Systems. Maastricht MEMS 2004 Technical Digest, 2004

We are currently developing a monolithic electron field emission device and integrated electron o... more We are currently developing a monolithic electron field emission device and integrated electron optic components for multi-electron beam lithography microsystems basing on a SO1 (Silicon On Insulator) wafer. In the Transducer'03 conference, we have reported the concept, simulation, fabrication, emission and focusing characteristics of the device with Pt, MO emitters [I].

Research paper thumbnail of A modified model for thermal conductivity of carbon nanotube-nanofluids

Physics of Fluids, 2015

ABSTRACT Carbon nanotubes (CNTs) are one of the most valuable materials with high thermal conduct... more ABSTRACT Carbon nanotubes (CNTs) are one of the most valuable materials with high thermal conductivity (above 1750 W/m K compared to thermal conductivity of Ag 419 W/m K). Owing to their very high thermal conductivity, CNTs are one of the most suitable nanoadditives in fabricating the nanofluid with thermal conductivities that are significantly higher than those of the parent liquids even when the CNTs’ concentrations are negligible. This work presents a modified model for predicting the thermal conductivity of carbon nanotube-nanofluids (CNT-nanofluids), which take into consideration the effects of size, volume fraction, and thermal conductivity of CNTs as well as the properties of base liquid. The modified model is found to correctly predict the trends observed in experimental data for different combinations of CNT-nanofluids with varying concentrations.

Research paper thumbnail of New Technique for the Synthesis of Carbon Nanotubes

Journal of the Korean Physical Society, 2008

Research paper thumbnail of Flexible carbon nanotube-array cathodes: Fabrication and bending effect on field-electron emission

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2010

The authors report the fabrication of freestanding field-electron emitters based on arrays of ver... more The authors report the fabrication of freestanding field-electron emitters based on arrays of vertically aligned carbon nanotubes (VACNTs) and flexible polydimethylsiloxane (PDMS). Transplant of VACNT arrays from silicon substrates to flexible PDMS platforms through a press-and-...

Research paper thumbnail of Synthesis of Carbon Nanotubes on Steel Foils

Journal of the Korean Physical Society, 2008

ABSTRACT

Research paper thumbnail of Synthesis of individual ultra-long carbon nanotubes and transfer to other substrates

Journal of Experimental Nanoscience, 2011

In this article, we report the synthesis of ultra-long carbon nanotubes (CNTs) by thermal chemica... more In this article, we report the synthesis of ultra-long carbon nanotubes (CNTs) by thermal chemical vapour deposition method. Ultra-long, individual and aligned CNTs were directly grown on a flat silicon substrate. The orientation of the nanotubes was found parallel to the gas flow direction. The ultra-long CNTs were grown with different transition metallic salts, such as nickel chloride, iron (III)

Research paper thumbnail of Combined model for growing mechanism of carbon nanotubes using HFCVD: effect of temperature and molecule gas diffusion

Thin Solid Films, 2009

Growth of a dense forest of vertically-aligned carbon-nanotubes (VA-CNTs) by a hot filament chemi... more Growth of a dense forest of vertically-aligned carbon-nanotubes (VA-CNTs) by a hot filament chemical vapor deposition (HFCVD) method was investigated. The growth of very pure VA-CNTs via the bottom growth mechanism was extremely fast during the initial few minutes, but it slowed down and reached the terminal height of a couple of millimeters. The different temporal variations of the VA-CNT height and growth rates corresponding to different growth stages indicated that a temperature-mediated thermodynamic model, precursor diffusion, and catalyst deactivation were responsible for the VA-CNT growth in respective stages.

Research paper thumbnail of Comparison of field-electron emission from different carbon nanotube array structures

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2009

The effect of macroscopic cathode structures, which consisted of an array of the identical vertic... more The effect of macroscopic cathode structures, which consisted of an array of the identical vertically aligned carbon nanotube (VACNT) columns in a particular arrangement, on the field emission was investigated. The electric field simulation based on the FEMLAB code showed ...

Research paper thumbnail of Schottky emitters with carbon nanotubes as electron source

The 13th International Conference on Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05., 2005

2C1.3 SCHOTTKY EMITTERS WITH CARBON NANOTUBES AS ELECTRON SOURCE Phan Ngoc Minh ', Nguyen Tu... more 2C1.3 SCHOTTKY EMITTERS WITH CARBON NANOTUBES AS ELECTRON SOURCE Phan Ngoc Minh ', Nguyen Tuan Hong ', Ngo Quang Minh ', Phan Hong Khoi', Yuka Nomura2, Takahito Ono3 and Masayoshi Esashi3 (l) Institute of Materials Science, Vietnamese Academy of ...

Research paper thumbnail of 166-Amaury-Hong-PRB2012

Research paper thumbnail of Thermal dissipation media for high power electronic devices using a carbon nanotube-based composite

Advances in Natural Sciences: Nanoscience and Nanotechnology, 2011

Challenges in the thermal dissipation of an electronic package arise from the continuous increase... more Challenges in the thermal dissipation of an electronic package arise from the continuous increase in power density of higher-power devices. Carbon nanotubes (CNTs) are known as the highest thermal conductivity material (2000 W mK −1 ). This excellent thermal property suggests an approach in applying the CNTs in thermal dispersion materials to solve the aforementioned problems. In this work, we present an effect of thermal dissipation of the CNTs in the high-brightness light emitting diode (HB-LED) and micro-processor. For the thermal dissipation of the HB-LED, a vertically aligned carbon nanotube (VA-CNT) film on a Cu substrate was applied. Meanwhile, for the thermal dissipation of a micro-processor, the composite of commercial thermal paste/CNTs was used instead of the VA-CNTs. The experimental and simulation results have confirmed the advantages of the VA-CNT film and thermal paste/CNT composite as excellent thermal dissipation media for HB-LEDs, µ-processors and other high power electronic devices.

Research paper thumbnail of Carbon-nanotube-based liquids: a new class of nanomaterials and their applications

Advances in Natural Sciences: Nanoscience and Nanotechnology, 2014

Carbon-nanotube-based liquids-a new class of nanomaterials-have shown many interesting properties... more Carbon-nanotube-based liquids-a new class of nanomaterials-have shown many interesting properties and distinctive features offering unprecedented potential for many applications. This paper summarizes the recent progress on the study of the preparation, characterization and properties of carbon-nanotube-based liquids including so-called nanofluids, nanolubricants and different kinds of nanosolutions containing multi-walled carbon nanotubes/single-walled carbon nanotubes/graphene. A broad range of current and future applications of these nanomaterials in the fields of energy saving, power electronic and optoelectronic devices, biotechnology and agriculture are presented. The paper also identifies challenges and opportunities for future research.

Research paper thumbnail of Simulation of Heat Dissipation for High Power Electronic Component using Carbon Nanotube Nanofluids

Carbon nanotubes(CNTs) aresomeof most valuable materials that have highest thermal conductivity.T... more Carbon nanotubes(CNTs) aresomeof most valuable materials that have highest thermal conductivity.The thermal conductivity of individual carbon nanotubes is 2000 Wm −1 K −1 compared with the thermal conductivity 419 Wm −1 K −1 of silver.Therefore, carbon nanotubes have opened a new way for heat dissipation for high power electronic components, such as micro-processor, high brightness LED, etc. In this paper, we present the simulation results on heat dissipation for a high power electronic component using carbon nanotube nanofluids.

Research paper thumbnail of Miniaturized, highly sensitive single-chip multichannel quartz-crystal microbalance

Applied Physics Letters, Dec 22, 2002

A miniaturized highly sensitive single-chip multichannel quartz-crystal microbalance prepared by ... more A miniaturized highly sensitive single-chip multichannel quartz-crystal microbalance prepared by deep reactive ion etching is presented. In the present work, quartz resonators in a single-chip with the diameters in the range 0.05-1.0 mm and thicknesses in the range 18-82 μm were fabricated. The conductance measurements carried out on the resonators showed that the Q factor is inversely proportional to resonator thickness. The Q-factor value as high as ˜30 000 has been observed in case of a 94 MHz resonator whose diameter is 1 mm and the thickness 17.8 μm. The Q factor of a resonator of very small diameter (0.1 mm) reached the value 5700.

Research paper thumbnail of Field electron emission from free-standing flexible PDMS-supported carbon-nanotube-array films

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2008

Fabrication of free-standing carbon-nanotube-(CNT) array films supported by PDMS (poly-dimethylsi... more Fabrication of free-standing carbon-nanotube-(CNT) array films supported by PDMS (poly-dimethylsiloxane) matrix, which opens up the possibility to transform deliberate CNT-array architecture into flexible electronic and photonic components, is reported. Low viscosity ...

Research paper thumbnail of Two new oleanane-type triterpene saponins from the leaves of Schefflera sessiliflora De P. V

Phytochemistry Letters, 2015

Research paper thumbnail of Carbon nanotube integrated on silicon tips for electron field emitter: tip apex patterning and emission characterization

TRANSDUCERS '03. 12th International Conference on Solid-State Sensors, Actuators and Microsystems. Digest of Technical Papers (Cat. No.03TH8664), 2003

Keywords: Carbon hanotuhe, Electron field emitte6 Tip apex patterning technique, Hot filament che... more Keywords: Carbon hanotuhe, Electron field emitte6 Tip apex patterning technique, Hot filament chemical vapor deposition. ... Electron field emission or cold emitter, where electron beam is emitted from a sharp tip under a strong electric field, have been paid much attention in ...

Research paper thumbnail of Carbon nanotube integrated on silicon tips for electron field emitter: tip apex patterning and emission characterization

TRANSDUCERS '03. 12th International Conference on Solid-State Sensors, Actuators and Microsystems. Digest of Technical Papers (Cat. No.03TH8664), 2003

Keywords: Carbon hanotuhe, Electron field emitte6 Tip apex patterning technique, Hot filament che... more Keywords: Carbon hanotuhe, Electron field emitte6 Tip apex patterning technique, Hot filament chemical vapor deposition. ... Electron field emission or cold emitter, where electron beam is emitted from a sharp tip under a strong electric field, have been paid much attention in ...

Research paper thumbnail of Flexible CNT-array cathodes: Effect of bending on field electron emission

2009 22nd International Vacuum Nanoelectronics Conference, 2009

In this work, we report results showing a correlation between the curvature of PDMS-supported CNT... more In this work, we report results showing a correlation between the curvature of PDMS-supported CNT-tip arrays and their emission properties. CNTs were produced by using a hot-filament chemical-vapor-deposition (HFCVD) setup. VA-CNTs were synthesized using 28-Torr mixtures of methane (20 SCCM) and hydrogen (30 SCCM) as feedstock. Temperatures of filaments and substrates were 2050 and 750 degC, respectively. In order to

Research paper thumbnail of Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes

Nature Communications, 2013

The optical properties of single-wall carbon nanotubes are very promising for developing novel op... more The optical properties of single-wall carbon nanotubes are very promising for developing novel opto-electronic components and sensors with applications in many fields. Despite numerous studies performed using photoluminescence or Raman and Rayleigh scattering, knowledge of their optical response is still partial. Here we determine using spatial modulation spectroscopy, over a broad optical spectral range, the spectrum and amplitude of the absorption cross-section of individual semiconducting single-wall carbon nanotubes. These quantitative measurements permit determination of the oscillator strength of the different excitonic resonances and their dependencies on the excitonic transition and type of semiconducting nanotube. A non-resonant background is also identified and its cross-section comparable to the ideal graphene optical absorbance. Furthermore, investigation of the same single-wall nanotube either free standing or lying on a substrate shows large broadening of the excitonic resonances with increase of oscillator strength, as well as stark weakening of polarization-dependent antenna effects, due to nanotube-substrate interaction.

Research paper thumbnail of Utilization of carbon nanotube and diamond for electron field emission devices

17th IEEE International Conference on Micro Electro Mechanical Systems. Maastricht MEMS 2004 Technical Digest, 2004

We are currently developing a monolithic electron field emission device and integrated electron o... more We are currently developing a monolithic electron field emission device and integrated electron optic components for multi-electron beam lithography microsystems basing on a SO1 (Silicon On Insulator) wafer. In the Transducer'03 conference, we have reported the concept, simulation, fabrication, emission and focusing characteristics of the device with Pt, MO emitters [I].

Research paper thumbnail of A modified model for thermal conductivity of carbon nanotube-nanofluids

Physics of Fluids, 2015

ABSTRACT Carbon nanotubes (CNTs) are one of the most valuable materials with high thermal conduct... more ABSTRACT Carbon nanotubes (CNTs) are one of the most valuable materials with high thermal conductivity (above 1750 W/m K compared to thermal conductivity of Ag 419 W/m K). Owing to their very high thermal conductivity, CNTs are one of the most suitable nanoadditives in fabricating the nanofluid with thermal conductivities that are significantly higher than those of the parent liquids even when the CNTs’ concentrations are negligible. This work presents a modified model for predicting the thermal conductivity of carbon nanotube-nanofluids (CNT-nanofluids), which take into consideration the effects of size, volume fraction, and thermal conductivity of CNTs as well as the properties of base liquid. The modified model is found to correctly predict the trends observed in experimental data for different combinations of CNT-nanofluids with varying concentrations.

Research paper thumbnail of New Technique for the Synthesis of Carbon Nanotubes

Journal of the Korean Physical Society, 2008

Research paper thumbnail of Flexible carbon nanotube-array cathodes: Fabrication and bending effect on field-electron emission

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2010

The authors report the fabrication of freestanding field-electron emitters based on arrays of ver... more The authors report the fabrication of freestanding field-electron emitters based on arrays of vertically aligned carbon nanotubes (VACNTs) and flexible polydimethylsiloxane (PDMS). Transplant of VACNT arrays from silicon substrates to flexible PDMS platforms through a press-and-...

Research paper thumbnail of Synthesis of Carbon Nanotubes on Steel Foils

Journal of the Korean Physical Society, 2008

ABSTRACT

Research paper thumbnail of Synthesis of individual ultra-long carbon nanotubes and transfer to other substrates

Journal of Experimental Nanoscience, 2011

In this article, we report the synthesis of ultra-long carbon nanotubes (CNTs) by thermal chemica... more In this article, we report the synthesis of ultra-long carbon nanotubes (CNTs) by thermal chemical vapour deposition method. Ultra-long, individual and aligned CNTs were directly grown on a flat silicon substrate. The orientation of the nanotubes was found parallel to the gas flow direction. The ultra-long CNTs were grown with different transition metallic salts, such as nickel chloride, iron (III)

Research paper thumbnail of Combined model for growing mechanism of carbon nanotubes using HFCVD: effect of temperature and molecule gas diffusion

Thin Solid Films, 2009

Growth of a dense forest of vertically-aligned carbon-nanotubes (VA-CNTs) by a hot filament chemi... more Growth of a dense forest of vertically-aligned carbon-nanotubes (VA-CNTs) by a hot filament chemical vapor deposition (HFCVD) method was investigated. The growth of very pure VA-CNTs via the bottom growth mechanism was extremely fast during the initial few minutes, but it slowed down and reached the terminal height of a couple of millimeters. The different temporal variations of the VA-CNT height and growth rates corresponding to different growth stages indicated that a temperature-mediated thermodynamic model, precursor diffusion, and catalyst deactivation were responsible for the VA-CNT growth in respective stages.

Research paper thumbnail of Comparison of field-electron emission from different carbon nanotube array structures

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2009

The effect of macroscopic cathode structures, which consisted of an array of the identical vertic... more The effect of macroscopic cathode structures, which consisted of an array of the identical vertically aligned carbon nanotube (VACNT) columns in a particular arrangement, on the field emission was investigated. The electric field simulation based on the FEMLAB code showed ...

Research paper thumbnail of Schottky emitters with carbon nanotubes as electron source

The 13th International Conference on Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05., 2005

2C1.3 SCHOTTKY EMITTERS WITH CARBON NANOTUBES AS ELECTRON SOURCE Phan Ngoc Minh ', Nguyen Tu... more 2C1.3 SCHOTTKY EMITTERS WITH CARBON NANOTUBES AS ELECTRON SOURCE Phan Ngoc Minh ', Nguyen Tuan Hong ', Ngo Quang Minh ', Phan Hong Khoi', Yuka Nomura2, Takahito Ono3 and Masayoshi Esashi3 (l) Institute of Materials Science, Vietnamese Academy of ...

Research paper thumbnail of 166-Amaury-Hong-PRB2012

Research paper thumbnail of Thermal dissipation media for high power electronic devices using a carbon nanotube-based composite

Advances in Natural Sciences: Nanoscience and Nanotechnology, 2011

Challenges in the thermal dissipation of an electronic package arise from the continuous increase... more Challenges in the thermal dissipation of an electronic package arise from the continuous increase in power density of higher-power devices. Carbon nanotubes (CNTs) are known as the highest thermal conductivity material (2000 W mK −1 ). This excellent thermal property suggests an approach in applying the CNTs in thermal dispersion materials to solve the aforementioned problems. In this work, we present an effect of thermal dissipation of the CNTs in the high-brightness light emitting diode (HB-LED) and micro-processor. For the thermal dissipation of the HB-LED, a vertically aligned carbon nanotube (VA-CNT) film on a Cu substrate was applied. Meanwhile, for the thermal dissipation of a micro-processor, the composite of commercial thermal paste/CNTs was used instead of the VA-CNTs. The experimental and simulation results have confirmed the advantages of the VA-CNT film and thermal paste/CNT composite as excellent thermal dissipation media for HB-LEDs, µ-processors and other high power electronic devices.

Research paper thumbnail of Carbon-nanotube-based liquids: a new class of nanomaterials and their applications

Advances in Natural Sciences: Nanoscience and Nanotechnology, 2014

Carbon-nanotube-based liquids-a new class of nanomaterials-have shown many interesting properties... more Carbon-nanotube-based liquids-a new class of nanomaterials-have shown many interesting properties and distinctive features offering unprecedented potential for many applications. This paper summarizes the recent progress on the study of the preparation, characterization and properties of carbon-nanotube-based liquids including so-called nanofluids, nanolubricants and different kinds of nanosolutions containing multi-walled carbon nanotubes/single-walled carbon nanotubes/graphene. A broad range of current and future applications of these nanomaterials in the fields of energy saving, power electronic and optoelectronic devices, biotechnology and agriculture are presented. The paper also identifies challenges and opportunities for future research.