Study of photophysical properties of capped US nanocrystals

被引：43

作者：

Chowdhury, Paramita Saha ^{[1
]}

Ghosh, Pushpal ^{[1
]}

Patra, Amitava ^{[1
]}

机构：

[1] Cent Glass & Ceram Res Inst, Sol Gel Div, Kolkata 700032, W Bengal, India

来源：

JOURNAL OF LUMINESCENCE | 2007年 / 124卷 / 02期

关键词：

nanoparticles; photoluminescence; optical properties;

D O I：

10.1016/j.jlumin.2006.04.001

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：327 / 332

页数：6

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