Journal
INTERNATIONAL JOURNAL OF NANOTECHNOLOGY
Volume 14, Issue 1-6, Pages 22-30Publisher
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJNT.2017.082439
Keywords
biomolecule-assisted hydrothermal/solvothermal synthesis; Cu3BiS3 nanoparticles; X-ray diffraction; UV-visible absorption
Funding
- Thailand's Office of the Higher Education Commission through the National Research University (NRU) Project for Chiang Mai University
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Cu3BiS3 nanoparticles were successfully synthesised by hydrothermal and solvothermal methods using L-cysteine biomolecules as a sulphur source and complexing agent. Phase and purity of the samples were characterised by X-ray diffraction (XRD) and selected area electron diffraction (SAED). Scanning and transmission electron microscopy (SEM and TEM) revealed the increasing of particle size from 29.8 +/- 6.3 nm to 89.6 +/- 17.2 nm by changing the medium solvents from de-ionised (DI) water to ethylenediamine (EN), in accordance with the decrease in the BET surface area from 17.5560 +/- 0.1170 m(2)/g for the DI particles to 4.0297 +/- 0.0370 m(2)/g for the EN particles. The absorption spectrum of highly crystalline Cu3BiS3 nanoparticles synthesised in EN was used to determine the direct energy gap (E-g) which was found to be 1.6 eV. In this research, a formation mechanism is proposed and discussed according to the experimental results.
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