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Papers by Md. Mosharraf Bhuiyan

Research paper thumbnail of Radionuclide Adsorption Performance in Cement and Soil Medium for Safety Issue of Radioactive Waste Disposal Facility

American Journal of Environmental Engineering, 2018

Radionuclide migration from a disposal facility is one of the most crucial factors for protecting... more Radionuclide migration from a disposal facility is one of the most crucial factors for protecting man and environment. To ensure safety of a disposal facility, radionuclide migration or adsorption behavior is a key issue in operational and post operational phase. In this perspective, laboratory based column experiments was carried out to investigate theadsorption behavior of radionuclide on the cement and soil mediums. Present experiments simulate the migration behavior of radionuclide through the cement and soil barrier into the environment if the waste packs inside a disposal site encounter rain infiltration. In this study, some simulant cement chunk was produced with a water-cement ratio of 0.50 each, and soil samples were prepared with various grain sizes from 90 µm to 2 mm. In this study adsorption and hence migration behavior of solid spent resin was verified experimentally. In addition, adsorption of two radionuclides, namely 60Co and 137Cs was investigated as liquid waste by...

Research paper thumbnail of Gas Sensing Properties of Metal Doped WO3Thin Film Sensors Prepared by Pulsed Laser Deposition and DC Sputtering Process

Japanese Journal of Applied Physics, 2006

Tungsten trioxide (WO 3) thin films gas sensors were prepared by the KrF excimer pulsed laser dep... more Tungsten trioxide (WO 3) thin films gas sensors were prepared by the KrF excimer pulsed laser deposition (PLD) method. The films were prepared on the quartz glass, silicon and also on the Al 2 O 3 sensor substrates with platinum interdigitated electrodes. The effect of doping of the platinum (Pt), palladium (Pd) or gold (Au) on the WO 3 thin film was also investigated. These metals were doped to the WO 3 thin film by the DC sputtering process during the PLD. The substrate temperature and the oxygen pressure were 400 C and 100 mTorr, respectively, during the deposition. The films were characterized by atomic force microscopy (AFM) and X-ray diffraction (XRD). The sensitivity of the prepared sensors to 60 ppm NO gas was examined using the two terminal resistance method in a chamber at atmospheric pressure and operating temperatures of 25-350 C. The sensitivity of the WO 3 thin films doped with Pt, Pd, or Au was found to be higher than that of the undoped WO 3 thin film.

Research paper thumbnail of Refining of red spinach extract for the enhanced photovoltaic performance of natural dye-based DSSC and degradation study

Research paper thumbnail of Effect of Combination of Natural Dyes and the Blocking Layer on the Performance of DSSC

Solar Cells - Theory, Materials and Recent Advances, 2021

Over the years, researchers have been working on replacing sensitized dye for dye sensitized sola... more Over the years, researchers have been working on replacing sensitized dye for dye sensitized solar cells (DSSC), because of its low production cost, biodegradability, and non-toxicity. However, the overall performance of natural dye-based DSSCs is low compared to the DSSCs sensitized with Ruthenium based dyes. The combination of natural dyes with an optimized choice of the extracting solvents and the proper volume ratio of mixture of the dyes, enhances inherent properties, such as absorption and adsorption of the dyes. It also allows the device to utilize photon energy more efficiently over the entire visible wavelength. As a result, DSSC sensitized with the dye mixture shows higher absorbance, and cumulative absorption properties over the whole visible region than the DSSC fabricated with individual dyes and showed higher photocurrent. Another effective way to improve cell efficiency is by using a blocking layer. The blocking layer increases the photocurrent, is mainly due to the i...

Research paper thumbnail of Improvement of efficiency of dye-sensitized solar cells by reduction of internal resistance

Applied Physics Letters, 2005

ABSTRACT

Research paper thumbnail of Effect of combination of natural dyes and post-TiCl4 treatment in improving the photovoltaic performance of dye-sensitized solar cells

Comptes Rendus Chimie

Abstract Herein, dye-sensitized solar cells (DSSCs) have been sensitized with natural red dye (ex... more Abstract Herein, dye-sensitized solar cells (DSSCs) have been sensitized with natural red dye (extracted from red spinach) and yellow dye (extracted from turmeric) and five different combinations of red and yellow dyes (at different volume ratios) to determine the optimum combination of red and yellow dyes for the maximum cell efficiency. In addition, the effect of post-TiCl4 treatment in improving cell efficiency has been studied. From UV-vis absorption spectrum, higher absorbance and cumulative absorption properties over the entire visible region show that the combination of red and yellow dyes absorbs light better than the individual red or yellow dyes. DSSCs sensitized with red and yellow dyes have a photoconversion efficiency of 0.416% and 0.921%, respectively. DSSCs sensitized with the combination of red and yellow dyes showed higher cell parameters than the DSSCs sensitized with the individual yellow or red dye. The photoelectrical parameters of DSSCs cosensitized with the optimum combination of dyes (40% red + 60% yellow) were as follows: short-circuit current (Isc) = 5.343 mA, open-circuit voltage (Voc) = 0.493 V, fill factor (FF) = 0.481, and overall photoconversion efficiency = 1.267%. However, after the treatment of FTO (fluorine doped tin oxide) / TiO2 with TiCl4, a significant amount of improvement in the Isc, Voc, and FF was observed. DSSCs fabricated with TiCl4-treated FTO/TiO2 and sensitized with the optimum combination of red and yellow dyes showed the following cell parameters: Isc= 5.829 mA, Voc= 0.498 V, and F·F = 0.541. Hence, the efficiency obtained was 1.572%, which is almost 1.24 times higher than that of the DSSCs fabricated without TiCl4 treatment. Finally, the possible effect of water content in the combination of dyes has been observed with a fixed amount of red dye in the combination.

Research paper thumbnail of NO Sensing Property of Carbon Nanotube Based Thin Film Gas Sensors Prepared by Chemical Vapor Deposition Techniques

Japanese Journal of Applied Physics, 2006

To prepare a gas sensor that can operate at room temperature, carbon nanotubes (CNTs) were grown ... more To prepare a gas sensor that can operate at room temperature, carbon nanotubes (CNTs) were grown on Al2O3 substrates with interdigital Pt electrodes (Al2O3 substrate) by both pulsed laser deposition (PLD) and chemical vapor deposition (CVD). In this combined method, Fe catalytic thin film was prepared by PLD and then CNTs were grown on the Fe thin film by thermal

Research paper thumbnail of Radionuclide Adsorption Performance in Cement and Soil Medium for Safety Issue of Radioactive Waste Disposal Facility

American Journal of Environmental Engineering, 2018

Radionuclide migration from a disposal facility is one of the most crucial factors for protecting... more Radionuclide migration from a disposal facility is one of the most crucial factors for protecting man and environment. To ensure safety of a disposal facility, radionuclide migration or adsorption behavior is a key issue in operational and post operational phase. In this perspective, laboratory based column experiments was carried out to investigate theadsorption behavior of radionuclide on the cement and soil mediums. Present experiments simulate the migration behavior of radionuclide through the cement and soil barrier into the environment if the waste packs inside a disposal site encounter rain infiltration. In this study, some simulant cement chunk was produced with a water-cement ratio of 0.50 each, and soil samples were prepared with various grain sizes from 90 µm to 2 mm. In this study adsorption and hence migration behavior of solid spent resin was verified experimentally. In addition, adsorption of two radionuclides, namely 60Co and 137Cs was investigated as liquid waste by...

Research paper thumbnail of Gas Sensing Properties of Metal Doped WO3Thin Film Sensors Prepared by Pulsed Laser Deposition and DC Sputtering Process

Japanese Journal of Applied Physics, 2006

Tungsten trioxide (WO 3) thin films gas sensors were prepared by the KrF excimer pulsed laser dep... more Tungsten trioxide (WO 3) thin films gas sensors were prepared by the KrF excimer pulsed laser deposition (PLD) method. The films were prepared on the quartz glass, silicon and also on the Al 2 O 3 sensor substrates with platinum interdigitated electrodes. The effect of doping of the platinum (Pt), palladium (Pd) or gold (Au) on the WO 3 thin film was also investigated. These metals were doped to the WO 3 thin film by the DC sputtering process during the PLD. The substrate temperature and the oxygen pressure were 400 C and 100 mTorr, respectively, during the deposition. The films were characterized by atomic force microscopy (AFM) and X-ray diffraction (XRD). The sensitivity of the prepared sensors to 60 ppm NO gas was examined using the two terminal resistance method in a chamber at atmospheric pressure and operating temperatures of 25-350 C. The sensitivity of the WO 3 thin films doped with Pt, Pd, or Au was found to be higher than that of the undoped WO 3 thin film.

Research paper thumbnail of Refining of red spinach extract for the enhanced photovoltaic performance of natural dye-based DSSC and degradation study

Research paper thumbnail of Effect of Combination of Natural Dyes and the Blocking Layer on the Performance of DSSC

Solar Cells - Theory, Materials and Recent Advances, 2021

Over the years, researchers have been working on replacing sensitized dye for dye sensitized sola... more Over the years, researchers have been working on replacing sensitized dye for dye sensitized solar cells (DSSC), because of its low production cost, biodegradability, and non-toxicity. However, the overall performance of natural dye-based DSSCs is low compared to the DSSCs sensitized with Ruthenium based dyes. The combination of natural dyes with an optimized choice of the extracting solvents and the proper volume ratio of mixture of the dyes, enhances inherent properties, such as absorption and adsorption of the dyes. It also allows the device to utilize photon energy more efficiently over the entire visible wavelength. As a result, DSSC sensitized with the dye mixture shows higher absorbance, and cumulative absorption properties over the whole visible region than the DSSC fabricated with individual dyes and showed higher photocurrent. Another effective way to improve cell efficiency is by using a blocking layer. The blocking layer increases the photocurrent, is mainly due to the i...

Research paper thumbnail of Improvement of efficiency of dye-sensitized solar cells by reduction of internal resistance

Applied Physics Letters, 2005

ABSTRACT

Research paper thumbnail of Effect of combination of natural dyes and post-TiCl4 treatment in improving the photovoltaic performance of dye-sensitized solar cells

Comptes Rendus Chimie

Abstract Herein, dye-sensitized solar cells (DSSCs) have been sensitized with natural red dye (ex... more Abstract Herein, dye-sensitized solar cells (DSSCs) have been sensitized with natural red dye (extracted from red spinach) and yellow dye (extracted from turmeric) and five different combinations of red and yellow dyes (at different volume ratios) to determine the optimum combination of red and yellow dyes for the maximum cell efficiency. In addition, the effect of post-TiCl4 treatment in improving cell efficiency has been studied. From UV-vis absorption spectrum, higher absorbance and cumulative absorption properties over the entire visible region show that the combination of red and yellow dyes absorbs light better than the individual red or yellow dyes. DSSCs sensitized with red and yellow dyes have a photoconversion efficiency of 0.416% and 0.921%, respectively. DSSCs sensitized with the combination of red and yellow dyes showed higher cell parameters than the DSSCs sensitized with the individual yellow or red dye. The photoelectrical parameters of DSSCs cosensitized with the optimum combination of dyes (40% red + 60% yellow) were as follows: short-circuit current (Isc) = 5.343 mA, open-circuit voltage (Voc) = 0.493 V, fill factor (FF) = 0.481, and overall photoconversion efficiency = 1.267%. However, after the treatment of FTO (fluorine doped tin oxide) / TiO2 with TiCl4, a significant amount of improvement in the Isc, Voc, and FF was observed. DSSCs fabricated with TiCl4-treated FTO/TiO2 and sensitized with the optimum combination of red and yellow dyes showed the following cell parameters: Isc= 5.829 mA, Voc= 0.498 V, and F·F = 0.541. Hence, the efficiency obtained was 1.572%, which is almost 1.24 times higher than that of the DSSCs fabricated without TiCl4 treatment. Finally, the possible effect of water content in the combination of dyes has been observed with a fixed amount of red dye in the combination.

Research paper thumbnail of NO Sensing Property of Carbon Nanotube Based Thin Film Gas Sensors Prepared by Chemical Vapor Deposition Techniques

Japanese Journal of Applied Physics, 2006

To prepare a gas sensor that can operate at room temperature, carbon nanotubes (CNTs) were grown ... more To prepare a gas sensor that can operate at room temperature, carbon nanotubes (CNTs) were grown on Al2O3 substrates with interdigital Pt electrodes (Al2O3 substrate) by both pulsed laser deposition (PLD) and chemical vapor deposition (CVD). In this combined method, Fe catalytic thin film was prepared by PLD and then CNTs were grown on the Fe thin film by thermal