Nano-phase cubic Mercury Sulphide: A transition from semimetal to semiconductor | Health & Environmental Research Online (HERO)

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Citation
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HERO ID

4190746

Reference Type

Journal Article

Title

Nano-phase cubic Mercury Sulphide: A transition from semimetal to semiconductor

Author(s)

Patel, BK; Sahu, SC; Sarangi, SN; Nayak, J; Rath, S; Sahu, SN

Year

2001

Page Numbers

233-239

Web of Science Id

WOS:000177182600020

Abstract

Nano-phase Mercury Sulphide is being prepared by an electrodeposition technique. The glancing angle X-ray diffraction (GXRD) and Transmission electron Microscopic (TEM) studies reveal that the deposited nano-phase material is Cubic Mercury Sulphide (beta-HgS) crystallized in Zincblende structure. The impurity, thickness and stoichiometry have been analyzed using Proton induced X-ray emission (PIXE) and Rutherford back scattering spectroscopic (RBS) studies. Optical absorption of nano-crystalline HgS samples shows a blue shift in their absorption threshold with decreasing crystalline size/decreasing electrolysis current density. Blue shift of the optical band gap at the zone center (Gamma-point) in the range of 1.0-2.0 eV from its bulk value (Eg = E(Gamma(1c)) - E(Gamma(15v)) = 0.5 eV) has been detected from the optical absorption studies. The transition from the bulk semimetal to semiconducting behavior is the interesting report of the present work.