Ultrasonication of bismuth telluride nanocrystals fabricated by solvothermal method

Chu, Sang-Hyon; Choi, Sang H.; Kim, Jae-Woo; King, Glen C.; Elliott, James R.

doi:10.1117/12.658071

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…Among the solar cell materials, CuInS 2 has been synthesized by sonochemical route Amiri et al, 2014). The ultrasonic irradiation helps in refining the shape of the desired particle, changes the surface morphology and also helps in degassing of the medium (Chu et al, 2006). The most dominant effects of ultrasonic waves are cavitation and acoustic streaming.…”

Section: Introductionmentioning

confidence: 99%

Simple one-pot sonochemical synthesis of copper sulphide nanoparticles for solar cell applications

Singh

Manivannan

Victoria

2019

Arabian Journal of Chemistry

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Copper sulphide nanoparticles for solar cell applications were synthesized by a single step sonochemical method using copper acetate and thiourea as precursors. The effects of sonication time, ultrasonic bath temperature and annealing temperature on particle properties were studied. Synthesized particles were characterized using scanning electron microscope, transmission electron microscope, X-ray diffraction spectrophotometer and UV-visible spectrophotometer. The particles were found to be a mixture of chalcocite, covellite and djurleite. The optical band gap of the particles was found to be in the range of 1.6-2.1 eV. Heat treatment of the particles was found to give rise to needle shaped particles while a bath temperature of 55°C yielded few nanoplates. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Introductionmentioning

confidence: 99%

Simple one-pot sonochemical synthesis of copper sulphide nanoparticles for solar cell applications

Singh

Manivannan

Victoria

2019

Arabian Journal of Chemistry

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“…To maximize its TE performance, bismuth telluride was first synthesized into a form of lowdimensional nanocrystal. 6,7 Since phonon scattering depends on the size and shape of the nanoparticles, good control over these parameters is essential. Basically, nanometer-sized particles tend to aggregate due to a large surface-to-volume ratio and high surface energy.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Performance Enhancement by Surrounding Crystalline Semiconductors with Metallic Nanoparticles

Kim

King

Park

et al. 2011

9th Annual International Energy Conversion Engineering Conference

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Direct conversion of thermal energy to electricity by thermoelectric (TE) devices may play a key role in future energy production and utilization. However, relatively poor performance of current TE materials has slowed development of new energy conversion applications. Recent reports have shown that the dimensionless Figure of Merit, ZT, for TE devices can be increased beyond the state-of-the-art level by nanoscale structuring of materials to reduce their thermal conductivity. New morphologically designed TE materials have been fabricated at the NASA Langley Research Center, and their characterization is underway. These newly designed materials are based on semiconductor crystal grains whose surfaces are surrounded by metallic nanoparticles. The nanoscale particles are used to tailor the thermal and electrical conduction properties for TE applications by altering the phonon and electron transport pathways. A sample of bismuth telluride decorated with metallic nanoparticles showed less thermal conductivity and twice the electrical conductivity at room temperature as compared to pure Bi 2 Te 3 . Apparently, electrons cross easily between semiconductor crystal grains via the intervening metallic nanoparticle bridges, but phonons are scattered at the interfacing gaps. Hence, if the interfacing gap is larger than the mean free path of the phonon, thermal energy transmission from one grain to others is reduced. Here we describe the design and analysis of these new materials that offer substantial improvements in thermoelectric performance.

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Parametric study on the stabilization of metal oxide nanoparticles in organic solvents: A case study with indium tin oxide (ITO) and heptane

Almansoori

Khorshidi

Sadri

et al. 2018

Ultrasonics Sonochemistry

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The tendency of nanoparticles (NPs) to form large aggregates has been a major limitation to their widespread applications where utilizing monodisperse and stable suspension of NPs is essential. The aggregation of NPs becomes more challenging when there is less affinity between the dispersed phase (NPs) and the continuous phase (solvent), such as, dispersion of hydrophilic metal oxide NPs into a nonpolar (organic) solvent. The objective of this study is to systematically investigate the synergistic effects of eight dispersion parameters on the size and stability of indium tin oxide (ITO) NPs in heptane. The matrix of experimentation was designed using an L Taguchi method. The analysis of variance (ANOVA) of the experimental results revealed that the most significant factors on the size and stability of NPs were the mass of ITO NPs and the volume of the dispersing agent. Taguchi signal-to-noise (SN) ratio analysis was used to determine the optimal factor levels for the preparation of well-dispersed and stable NP suspensions. Confirmation tests were carried out at the suggested levels of the ANOVA predictive model, and highly stable ITO NPs in heptane with the size distribution of 43.0-68.3nm were obtained. The results of the present parametric study can be used for a broad range of applications where effective stabilization of metal oxide NPs in organic solvents is desired.

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Ultrasonication of bismuth telluride nanocrystals fabricated by solvothermal method

Cited by 4 publications

References 33 publications

Simple one-pot sonochemical synthesis of copper sulphide nanoparticles for solar cell applications

Simple one-pot sonochemical synthesis of copper sulphide nanoparticles for solar cell applications

Thermoelectric Performance Enhancement by Surrounding Crystalline Semiconductors with Metallic Nanoparticles

Parametric study on the stabilization of metal oxide nanoparticles in organic solvents: A case study with indium tin oxide (ITO) and heptane

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