Study of photophysical properties of capped CdS nanocrystals

Chowdhury, Paramita Saha ; Ghosh, Pushpal ; Patra, Amitava (2007) Study of photophysical properties of capped CdS 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 CdS 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 〈τ〉are 6.24, 4.54 and 2.84 ns for uncapped, capped with SiO2 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
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Nanoparticles; Photoluminescence; Optical properties
ID Code:104831
Deposited On:01 Dec 2017 11:16
Last Modified:01 Dec 2017 11:16

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