Preparation and Thermal Characterization of Annealed Gold Coated Porous Silicon

Behzad, Kasra; Yunus, Wan Mahmood Mat; Talib, Zainal Abidin; Zakaria, Azmi; Bahrami, Afarin

doi:10.3390/ma5010157

Cited by 21 publications

(5 citation statements)

References 30 publications

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“…2 (f), the percentage of porosity shows a progressive increment up to approximately 35% and resulted to the decreased of thermal diffusivity from 4.58 x 10 -6 m 2 s -1 to 2.59 x 10 -6 m 2 s -1 . This behavior is in line with previous study [7]. The decreased in the thermal diffusivity with increased porosity is a consequence of the decrease in the mean free path, due to the phonon confinement in the crystallite [8,9].…”

Section: Resultssupporting

confidence: 93%

THERMAL DIFFUSIVITY STUDIES OF ZnO-CuO AT HIGH TEMPERATURES

Akhir

Wahab

2015

Jurnal Teknologi

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An n-type semiconducting oxide such as Zinc Oxide (ZnO) has been exploited for their well-known gas sensing properties. Previous studies on these applications have mainly focused on electrical properties. Only limited reports were available on thermophysical properties of ZnO-based ceramics gas sensor. Therefore in this work, we report on the thermal diffusivity of Zinc Oxide-Copper Oxide (ZnO-CuO) ceramic composites by solid-state method using a laser flash technique. Thermal diffusivity of samples was measured at temperatures between 27 °C to 400 °C. The role of CuO was observed to enhance the thermal diffusivity of ZnO system with respect to the temperatures. ZnO-CuO samples played a significant role in improvement of thermal diffusivity value at temperature of 200 °C and above. Subsequently, sample of higher thermal diffusivity will exhibit lower initialization time for gas sensor to activate. Hence, the enhanced thermal diffusivity suggested that ZnO-CuO composite samples hold a promising possibility in gas sensor application.

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Section: Resultssupporting

confidence: 93%

THERMAL DIFFUSIVITY STUDIES OF ZnO-CuO AT HIGH TEMPERATURES

Akhir

Wahab

2015

Jurnal Teknologi

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“…9 However, there are few works focusing on the applications of PS in alkali solution resulting from the corrosion and dissolution of PS in alkali solution. [10][11][12][13][14] Up to the present, there are no relevant research on PS corrosion and dissolution in alkali solution. As a result, in order to extend the study on the PS corrosion in alkali solution, several PS samples were fabricated by electrochemical anodisation, and a detailed study into the effect of organic solvent, temperature and concentration on the corrosion rate for PS in KOH and NaOH aqueous solution was investigated by weight loss measurements.…”

Section: Introductionmentioning

confidence: 99%

Study on corrosion of porous silicon in KOH and NaOH solution

Lai

Xiang

et al. 2014

Corrosion Engineering, Science and Technology

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The corrosion of porous silicon in KOH and NaOH aqueous solution with or without organic solvents was studied by weight loss measurements. The results show that the corrosion rate goes up with increasing temperature and concentration of alkali solution. In the 1?0M NaOH aqueous solution, the corrosion rate can be improved with the additives of ethanol or methanol, and reduced by the additives of acetonitrile, isopropanol or N,N-dimethylformamide. The activation parameters of E a , A, DH a and DS a of porous silicon corrosion in KOH and NaOH aqueous solution with or without ethanol were calculated and discussed.

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“…When the frequency was increased, the sample became thermally thick, and the thermal waves penetrated into the sample; the detector then produced a PE signal, and this PE signal decreased exponentially with increasing frequency modulation. At high frequencies in the range of 50 to 200 Hz, the anomalous signal was very small and largely independent of the frequency [ 30 ]. The PE signals were therefore fitted only in the thermally thick area, and the curves were linear in the useful frequency range of 5 to 30 Hz, as shown in Figure 7 B.…”

Section: Resultsmentioning

confidence: 99%

Fabrication, characterization, and thermal property evaluation of silver nanofluids

et al. 2014

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Silver nanoparticles were successfully prepared in two different solvents using a microwave heating technique, with various irradiation times. The silver nanoparticles were dispersed in polar liquids (distilled water and ethylene glycol) without any other reducing agent, in the presence of the stabilizer polyvinylpyrrolidone (PVP). The optical properties, thermal properties, and morphology of the synthesized silver particles were characterized using ultraviolet-visible spectroscopy, photopyroelectric technique, and transmission electron microscopy. It was found that for the both solvents, the effect of microwave irradiation was mainly on the particles distribution, rather than the size, which enabled to make stable and homogeneous silver nanofluids. The individual spherical nanostructure of self-assembled nanoparticles has been formed during microwave irradiation. Ethylene glycol solution, due to its special properties, such as high dielectric loss, high molecular weight, and high boiling point, can serve as a good solvent for microwave heating and is found to be a more suitable medium than the distilled water. A photopyroelectric technique was carried out to measure thermal diffusivity of the samples. The precision and accuracy of this technique was established by comparing the measured thermal diffusivity of the distilled water and ethylene glycol with values reported in the literature. The thermal diffusivity ratio of the silver nanofluids increased up to 1.15 and 1.25 for distilled water and ethylene glycol, respectively.

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Preparation and Thermal Characterization of Annealed Gold Coated Porous Silicon

Cited by 21 publications

References 30 publications

THERMAL DIFFUSIVITY STUDIES OF ZnO-CuO AT HIGH TEMPERATURES

THERMAL DIFFUSIVITY STUDIES OF ZnO-CuO AT HIGH TEMPERATURES

Study on corrosion of porous silicon in KOH and NaOH solution

Fabrication, characterization, and thermal property evaluation of silver nanofluids

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