Effect of relative amount of complexing agents on the properties of Sb2S3 precipitated powders |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan;1. Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, PR China;2. Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen, 518055, PR China;1. Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas, Laboratorio de Materiales I, Av. Universidad, Cd. Universitaria, 66451, San Nicolás de los Garza, Nuevo León, Mexico;2. Centro de Investigación en Materiales Avanzados S. C. Unidad Monterrey, Alianza Norte # 202, Autopista Monterrey-Aeropuerto Km.10., C.P. 66628, Apodaca, Nuevo León, Mexico;1. Shenzhen Key Laboratory of Advanced Thin Films and Applications, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, Guangdong, PR China;2. National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, Department of Biomedical Engineering, School of Medicine, Shenzhen University, Shenzhen, 518060, China |
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| Abstract: | Powders of Sb2S3 are obtained by a bulk preparation technique using aqueous solutions of antimony trichloride and thioacetamide for two different complexing agents, namely, oxalic acid and tartaric acid. The concentration of solution is kept constant at 0.1 M and only the concentration of complexing agent is varied. The effect of concentration of the complexing agents on the properties of precipitated powder is studied. The powders precipitated using oxalic acid are grey, whereas the powders precipitated using tartaric acid are orange in colour. X-ray diffraction studies reveal that the powders are polycrystalline in nature. Crystallinity using the former acid is relatively higher than that with the latter. It has been observed that the crystallinity goes on decreasing as the concentration of complexing agents increases. Infrared spectroscopy studies indicate the presence of carbon and absorbed water in the powders complexed with oxalic acid. Optical absorption studies show that the direct bandgap energy of the precipitated powders prepared using oxalic acid varies from 1.59 to 1.98 eV and it is found to be higher (1.98 eV) for powder prepared using 0.25 M oxalic acid, while for powders prepared using tartaric acid, it varies from 1.92 to 2.02 eV and is found to be higher (2.02 eV) for the powder prepared using 0.75 M tartaric acid. Electrical resistivity study reveals that the room-temperature electrical resistivity of the powders prepared using oxalic acid is relatively lower (104–106 Ω cm) than that of tartaric-acid-complexed powders (105–107 Ω cm). |
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