Metal-enhanced fluorescence of CdTe nanocrystals in aqueous solution.
Metal-enhanced fluorescence of CdTe nanocrystals in aqueous solution.
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DOI：
10.1002/cphc.201000239
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
Rongqing Li;Shuhong Xu;Chunlei Wang;Haibao Shao;Qinying Xu;Yiping Cui
中科院分区：
文献类型：
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作者：
Rongqing Li;Shuhong Xu;Chunlei Wang;Haibao Shao;Qinying Xu;Yiping Cui
研究了半导体纳米晶体（NC）的金属增强荧光。水溶液中的金属增强荧光很少受到关注，但它在生物科学中具有巨大的潜在应用。在这项工作中，我们通过简单地混合 CdTe NC 和 Au 纳米颗粒（两者都带负电）来直接观察 CdTe NC 溶液的金属增强荧光。为了研究水溶液中的这种光致发光增强，我们提出了一种校准方法，该方法考虑了溶液中的光衰减。考虑到传输中的光减弱，最大PL增强约为没有Au NPs的PL增强的3倍。详细研究了与荧光强度增强相关的一些因素，例如CdTe NCs和Au NPs的浓度和摩尔进料比。此外，还得到了Au NPs引起的CdTe NCs寿命的缩短，这与光致发光的增强是一致的。
Metal-enhanced fluorescence of semiconductor nanocrystals (NCs) is investigated. There is very little attention paid to the metal-enhanced fluorescence in aqueous solution, which has great potential applications in bioscience. In this work, we directly observe metal-enhanced fluorescence of CdTe NC solution by simply mixing CdTe NCs and Au nanoparticles, both of which are negatively charged. In order to study this kind of photoluminescence enhancement in aqueous solutions, we propose a calibration method, which takes into account the light attenuation in solutions. After consideration of the light weakening in transmission, the maximal PL enhancement is about 3 times as large as the ones without Au NPs. Some factors related to the enhanced magnitude of fluorescence, for instance, the concentration and the molar feed ratio of CdTe NCs and Au NPs, are studied in detail. Furthermore, the decreased lifetimes of CdTe NCs induced by Au NPs are also obtained, which are in accord with the enhancement of the photoluminescence.