標題: Study of fluorescence enhancement of colloidal CdSe/ZnS quantum dots bound to hexadecylamine by single-molecule measurements
作者: Yuan, Chi-Tsu
Chou, Wu-Ching
Chen, Yueh-Nan
Chou, Jui-Wen
Chuuji, Der-San
Lin, Cheng-An J.
Li, Jimmy K.
Chang, Walter H.
Shen, Ji-Lin
電子物理學系
Department of Electrophysics
公開日期: 25-Oct-2007
摘要: Fluorescence enhancement of colloidal CdSe/ZnS quantum dots (QDs) by the binding of hexadecylamine (HDA) ligands was investigated at the single-QD level. The blinking behavior of individual CdSe/ZnS QDs can be dramatically modified by additional HDA ligands. Both the ratio of the mean on/off time lengths and the total number of emitted photons within the on-time duration can be enhanced, by factors of up to 2.8 and 13, respectively. Consequently, the blinking rate can be suppressed down to 18%. The fluorescence decay curve is closer to a single-exponential decay profile and has a longer measured lifetime. These results suggest that HDA ligands can further improve surface passivation.
URI: http://dx.doi.org/10.1021/jp074561p
http://hdl.handle.net/11536/10221
ISSN: 1932-7447
DOI: 10.1021/jp074561p
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 111
Issue: 42
起始頁: 15166
結束頁: 15172
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