Cyclic microwave radiation synthesis, photoconductivity, and optical properties of CuInS<inf>2</inf>hollow sub-microspheres

© 2018 Elsevier B.V. CuInS 2 powder was synthesized by a cyclic microwave irradiation method using L-cysteine as a sulfur source. The effect of microwave power (180–600 W) on the purity, morphology, and particle size of the synthesized powders was investigated. X-ray diffraction (XRD) analysis showe...

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Main Authors: Nawapong Chumha, Titipun Thongtem, Somchai Thongtem, Sila Kittiwachana, Sulawan Kaowphong
Format: Journal
Published: 2018
Online Access:https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85044749159&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/48367
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-483672018-04-25T10:11:31Z Cyclic microwave radiation synthesis, photoconductivity, and optical properties of CuInS<inf>2</inf>hollow sub-microspheres Nawapong Chumha Titipun Thongtem Somchai Thongtem Sila Kittiwachana Sulawan Kaowphong © 2018 Elsevier B.V. CuInS 2 powder was synthesized by a cyclic microwave irradiation method using L-cysteine as a sulfur source. The effect of microwave power (180–600 W) on the purity, morphology, and particle size of the synthesized powders was investigated. X-ray diffraction (XRD) analysis showed that the synthesized powders were pure CuInS 2 with a tetragonal structure. Transmission electron microscopy (TEM) analysis revealed that the CuInS 2 powder synthesized at 180 W composed of solid microspheres with a diameter of about 250 nm. Increasing the microwave power to 300 W and 450 W transformed some of the sub-microspheres into hollow sub-microspheres. At 600 W, all of the CuInS 2 sub-microspheres were hollow. Based on time-dependent experiment, formation mechanisms of the CuInS 2 solid and hollow sub-microspheres were discussed. The photoconductivity of the CuInS 2 hollow sub-microspheres was greater than that of the CuInS 2 solid sub-microspheres, suggesting that the CuInS 2 hollow sub-microspheres were favorable to increase current carrier concentration and to improve electron transport. UV–vis diffuse reflectance spectrum (UV–vis DRS) of the CuInS 2 hollow sub-microspheres showed strong absorption intensity with a direct band gap energy of 1.48 eV, which is potentially useful in solar-light driven applications. 2018-04-25T10:11:31Z 2018-04-25T10:11:31Z 2018-07-31 Journal 01694332 2-s2.0-85044749159 10.1016/j.apsusc.2018.03.210 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85044749159&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/48367
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
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description © 2018 Elsevier B.V. CuInS 2 powder was synthesized by a cyclic microwave irradiation method using L-cysteine as a sulfur source. The effect of microwave power (180–600 W) on the purity, morphology, and particle size of the synthesized powders was investigated. X-ray diffraction (XRD) analysis showed that the synthesized powders were pure CuInS 2 with a tetragonal structure. Transmission electron microscopy (TEM) analysis revealed that the CuInS 2 powder synthesized at 180 W composed of solid microspheres with a diameter of about 250 nm. Increasing the microwave power to 300 W and 450 W transformed some of the sub-microspheres into hollow sub-microspheres. At 600 W, all of the CuInS 2 sub-microspheres were hollow. Based on time-dependent experiment, formation mechanisms of the CuInS 2 solid and hollow sub-microspheres were discussed. The photoconductivity of the CuInS 2 hollow sub-microspheres was greater than that of the CuInS 2 solid sub-microspheres, suggesting that the CuInS 2 hollow sub-microspheres were favorable to increase current carrier concentration and to improve electron transport. UV–vis diffuse reflectance spectrum (UV–vis DRS) of the CuInS 2 hollow sub-microspheres showed strong absorption intensity with a direct band gap energy of 1.48 eV, which is potentially useful in solar-light driven applications.
format Journal
author Nawapong Chumha
Titipun Thongtem
Somchai Thongtem
Sila Kittiwachana
Sulawan Kaowphong
spellingShingle Nawapong Chumha
Titipun Thongtem
Somchai Thongtem
Sila Kittiwachana
Sulawan Kaowphong
Cyclic microwave radiation synthesis, photoconductivity, and optical properties of CuInS<inf>2</inf>hollow sub-microspheres
author_facet Nawapong Chumha
Titipun Thongtem
Somchai Thongtem
Sila Kittiwachana
Sulawan Kaowphong
author_sort Nawapong Chumha
title Cyclic microwave radiation synthesis, photoconductivity, and optical properties of CuInS<inf>2</inf>hollow sub-microspheres
title_short Cyclic microwave radiation synthesis, photoconductivity, and optical properties of CuInS<inf>2</inf>hollow sub-microspheres
title_full Cyclic microwave radiation synthesis, photoconductivity, and optical properties of CuInS<inf>2</inf>hollow sub-microspheres
title_fullStr Cyclic microwave radiation synthesis, photoconductivity, and optical properties of CuInS<inf>2</inf>hollow sub-microspheres
title_full_unstemmed Cyclic microwave radiation synthesis, photoconductivity, and optical properties of CuInS<inf>2</inf>hollow sub-microspheres
title_sort cyclic microwave radiation synthesis, photoconductivity, and optical properties of cuins<inf>2</inf>hollow sub-microspheres
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85044749159&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/48367
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