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Study of photophysical properties of capped US nanocrystals

IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata

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Title Study of photophysical properties of capped US nanocrystals
Creator Saha Chowdhury, Paramita
Ghosh, Pushpal
Patra, Amitava
Subject Physical Properties
Description Here, we have examined the role of capping agent on the optical properties of US nanoparticles by steady-state and time-resolved photoluminescence (PL) spectroscopy. The estimated particles sizes are 3.45, 2.5 and 2.39 nm for uncapped, capped with silica (SiO2) and thiosalicylic acid (TSA), respectively. The absorption and emission spectra show a clear blue shift to shorter wavelengths in presence of TSA- and SiO2-capped nanoparticles. It is found that the average decay time <tau > are 6.24, 4.54 and 2.84 ns for uncapped, capped with SiO, and TSA nanoparticles, respectively. Our analysis suggests that the hole or the electron is trapped on thiol molecule of TSA or hydroxyl group of SiO2, then radiative recombination of the electron and hole is delayed, resulting in strong quenching of PL efficiency.
Publisher ELSEVIER
Date 2007-06
Type Article
Format application/pdf
Identifier http://cgcri.csircentral.net/377/1/J_Lumines_124_(2007)_327%E2%80%93332.pdf
Saha Chowdhury, Paramita and Ghosh, Pushpal and Patra, Amitava (2007) Study of photophysical properties of capped US nanocrystals. JOURNAL OF LUMINESCENCE , 124 (2). pp. 327-332. ISSN 0022-2313
Relation http://cgcri.csircentral.net/377/