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Enhanced Trapping Efficiency in Acid-Treated Silica Nanostructures

DSpace at IIT Bombay

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Field Value
 
Title Enhanced Trapping Efficiency in Acid-Treated Silica Nanostructures
 
Creator BANERJEE, S
MAITY, S
DATTA, A
 
Subject SOL-GEL METHOD
VISIBLE PHOTOLUMINESCENCE
SIO2 NANOPARTICLES
STATE
NANOCRYSTALS
LUMINESCENCE
NANOWIRES
NANOTUBES
TEMPLATE
EMISSION
 
Description The color of the photoluminescence (PL) of silica nanostructures changes remarkably from blue to bluish green, with the addition of mineral acids. This remarkable observation is rationalized in light of an excited-state protonation of some of the trap states, as well as electrostatic assistance provided by the H(3)O(+) ions adsorbed at the surface. A combination of these two leads to more efficient trapping. The enhanced trapping is manifested in the time-resolved PL parameters and spectra. A fast decay of PL is observed in the higher-energy region of the spectrum, while a rise, with an almost equal time constant, is observed at the lower-energy end. Time-resolved area-normalized emission spectra are dominated by a structured spectrum in the high-energy region at shorter times and a broad, red shifted spectrum at longer times.
 
Publisher AMER CHEMICAL SOC
 
Date 2012-06-26T09:06:47Z
2012-06-26T09:06:47Z
2011
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY C,115(46)22804-22809
1932-7447
http://dx.doi.org/10.1021/jp2068039
http://dspace.library.iitb.ac.in/jspui/handle/100/14258
 
Language English