Surface-Modified Silicon Nanoparticles with Ultrabright Photoluminescence and Single-Exponential Decay for Nanoscale Fluorescence Lifetime Imaging of Temperature
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- 作者：Qi Li ; Yao He ; Jian Chang ; Lei Wang ; Hongzheng Chen ; Yan-Wen Tan ; Haiyu Wang ; Zhengzhong Shao
- 刊名：Journal of the American Chemical Society
- 出版年：2013
- 出版时间：October 9, 2013
- 年：2013
- 卷：135
- 期：40
- 页码：14924-14927
- 全文大小：278K
- 年卷期：v.135,no.40(October 9, 2013)
- ISSN：1520-5126
文摘
In this Communication, we report fabrication of ultrabright water-dispersible silicon nanoparticles (SiNPs) with quantum yields (QYs) up to 75% through a novelly designed chemical surface modification. A simple one-pot surface modification was developed that improves the photoluminescent QYs of SiNPs from 8% to 75% and meanwhile makes SiNPs water-dispersible. Time-correlated single photon counting and femtosecond time-resolved photoluminescence techniques demonstrate the emergence of a single and uncommonly highly emissive recombination channel across the entire NP ensemble induced by surface modification. The extended relatively long fluorescence lifetime (FLT), with a monoexponential decay, makes such surface-modified SiNPs suitable for applications involving lifetime measurements. Experimental results demonstrate that the surface-modified SiNPs can be utilized as an extraordinary nanothermometer through FLT imaging.