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Role of the surface polarity in governing the luminescence properties of ZnO nanoparticles synthesized by Sol-gel route

DSpace at IIT Bombay

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Title Role of the surface polarity in governing the luminescence properties of ZnO nanoparticles synthesized by Sol-gel route
 
Creator SHARMA, A
DHAR, S
SINGH, BP
 
Subject ZnO
Photoluminescence
Hydroxyl groups
Surface charge
OPTICAL-PROPERTIES
NANOROD
GROWTH
DEVICE
SENSOR
CELLS
 
Description ZnO nanoparticle samples, which are synthesized by a sol-gel route and collected after various stages of a washing procedure, are systematically investigated using a variety of experimental techniques. The study shows that while the surface charge polarity is positive for the as-grown (unwashed) particles, the surface turns negatively charged when the particles are sufficiently washed. This dissimilar surface charge polarity has been found to result in markedly different luminescence characteristics for the two cases (washed and unwashed). Our study of the luminescence properties under different surrounding conditions furthermore reveals that the major source for the GL emission for these nanoparticles is the hydroxyl groups, which are physisorbed on the surface. (C) 2013 Elsevier B. V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-15T08:33:52Z
2014-10-15T08:33:52Z
2013
 
Type Article
 
Identifier APPLIED SURFACE SCIENCE, 273144-149
http://dx.doi.org/10.1016/j.apsusc.2013.01.215
http://dspace.library.iitb.ac.in/jspui/handle/100/14694
 
Language en