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

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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.

Item Type: Article
Subjects: Physical Properties
Depositing User: Namita Dutta
Date Deposited: 24 Jan 2012 10:11
Last Modified: 24 Jan 2012 10:11

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