Study of electric conduction mechanisms, dielectric relaxation behaviour and density of states in zinc sulphide nanoparticles

Autor: Raja Yasir Mehmood, M. F. Afsar, A. Jamil, S. Fareed, F. Siddique, M. H. Bhatti, M. Ali, M. A. Rafiq
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Journal of Taibah University for Science, Vol 15, Iss 1, Pp 1144-1155 (2021)
Druh dokumentu: article
ISSN: 1658-3655
16583655
DOI: 10.1080/16583655.2021.2011595
Popis: Zinc Sulfide (ZnS) nanoparticles were synthesized by solid-state reaction method at 190°C. Dielectric, electrical properties, and conduction mechanism of ZnS nanoparticles were investigated. Average crystallite size and interplanar spacing of ZnS nanoparticles were approximately 4.47 nm and 1.92 Å respectively. The nanoparticles were spherical with size range of 10–20 nm. Complex impedance spectroscopy (CIS) of ZnS nanoparticles was performed at 20 Hz to 2 MHz and 236–320 K. The ZnS nanoparticles have negative temperature coefficient of resistance (NTCR). The AC measurements of ZnS nanoparticles from 236 K to 320 K revealed that the conduction in ZnS nanoparticles is due to correlated barrier hopping (CBH). The density of states (DOS) of ZnS nanoparticles have been calculated by CBH model as a function of temperature using photon frequency (fo) 1013 Hz and localized wave function (α) 1010 m−1 which ratified hopping as dominant conduction mechanism in ZnS nanoparticles.
Databáze: Directory of Open Access Journals
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