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Effect of surface groups on the luminescence property of ZnO nanoparticles synthesized by sol-gel route

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Title Effect of surface groups on the luminescence property of ZnO nanoparticles synthesized by sol-gel route
 
Creator SHARMA, A
SINGH, BP
DHAR, S
GONDORF, A
SPASOVA, M
 
Subject ZnO
Sol-gel
Photoluminescence
Surface groups
Physisorption
GREEN LUMINESCENCE
ZINC-OXIDE
PHOTOLUMINESCENCE
EMISSION
DEFECTS
GROWTH
 
Description Structural and optical properties of ZnO nanoparticles of diameter similar to 5 nm synthesized by a sol-gel route, have been studied using a variety of experimental techniques. The photoluminescence (PL) study carried out on these particles in the atmospheric and vacuum conditions shows a suppression of the defect related green luminescence (GL) band and a simultaneous enhancement of the near-band-edge ultra violet luminescence (UVL) when the surroundings of the nanoparticles are evacuated. This observation clearly suggests that GL is originating from certain groups that are physisorbed on the surface of the nanoparticles. Fourier transform infrared spectroscopy (FTIR) that has also been conducted at the vacuum and atmospheric conditions reveals the presence of the hydroxyl and the acetate groups in these nanoparticle samples. These groups are also found to be removed upon evacuation, suggesting that there is physical adsorption on the surface of the nanoparticles. When the PL spectrum is recorded again at the atmospheric condition, the GL intensity recovers almost up to its original value. Since there are substantial amount of water molecules present in air, which can source the hydroxyl groups, while the acetate groups are not expected to be abundant in air, this finding further suggests that the hydroxyl groups rather than the acetate groups are the likely cause for the GL emission observed in this system. (C) 2011 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-15T08:31:51Z
2014-10-15T08:31:51Z
2012
 
Type Article
 
Identifier SURFACE SCIENCE, 606(3-4)L13-L17
http://dx.doi.org/10.1016/j.susc.2011.09.006
http://dspace.library.iitb.ac.in/jspui/handle/100/14690
 
Language en