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首页> 外文会议>Conference on Sensors, and Command, Control, Communications, and Intelligence(C31) Technologies for Homeland Security and Homeland Defense III pt.1; 20040412-20040416; Orlando,FL; US >Quantum dots for detection of trace amount of non-volatile explosives: the effect of TNT in the fluorescence of CdSe quantum dots
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Quantum dots for detection of trace amount of non-volatile explosives: the effect of TNT in the fluorescence of CdSe quantum dots

机译：用于检测痕量非挥发性炸药的量子点：TNT对CdSe量子点荧光的影响

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摘要

We report on the effect of trinitrotoluene (TNT) in the fluorescence emission of CdSe quantum dots covered with a ZnS core shell. Pulses of 100 femtoseconds are employed to excite the fluorescence of the dots off resonance. We found evidence for a strong quenching by TNT on the fluorescence emission of the quantum dots. The fluorescence emission of the QD experiences a blue or red shift that depends on the CdSe particle size and amount of TNT. The results are explained in terms of a charge transfer mechanism or a modification of the traps involved in electron relaxation in QD. The results show that QD are a promising tool for TNT sensing.
机译：我们报告了三硝基甲苯（TNT）在覆盖有ZnS核壳的CdSe量子点的荧光发射中的作用。使用100飞秒的脉冲激发共振点的荧光。我们发现了通过TNT对量子点的荧光发射进行强淬灭的证据。 QD的荧光发射会发生蓝移或红移，具体取决于CdSe粒径和TNT量。用电荷转移机制或量子点中电子弛豫所涉及的陷阱的修饰来解释结果。结果表明，QD是用于TNT传感的有前途的工具。

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