Abstract
High temperature rocksalt phases of AgBiS2 and AgBiS2-xSex (x = 0.05–0.1) have been kinetically stabilized at room temperature in nanocrytals (∼11 nm) by simple solution-based synthesis. Experimental evidence for this derives from variable temperature powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and electron diffraction analysis. The band gap of the AgBiS2 nanocrystals (∼1.0 eV) is blue-shifted by quantum confinement relative to that of the cubic bulk phase of AgBiS2. Moreover, systematic lower energy shift of the band gap in AgBiS2-xSex nanocrystals compared to pristine nanocrystalline AgBiS2 was observed with increasing Se concentration. Existence of fascinating order–disorder type transition in these nanocrystals was evidenced by temperature dependent electrical conductivity, thermopower, and heat capacity measurements. Disordered cation sublattice and nanoscale grain boundaries coupled with strong Bi–S bond anharmonicity allow effectiv...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
