Growth kinetics of CdSe nanoparticles synthesized in reverse micelles using bis(trimethylsilyl) selenium precursor
Growth kinetics of CdSe nanoparticles synthesized in reverse micelles using bis(trimethylsilyl) selenium precursor
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DOI：
10.2478/s11532-007-0018-8
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发表时间：
2007-06
影响因子：
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通讯作者：
S. Emin;C. Dushkin;S. Nakabayashi;E. Adachi
中科院分区：
文献类型：
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作者：
S. Emin;C. Dushkin;S. Nakabayashi;E. Adachi
我们首先关注了CdSe半导体纳米晶体微乳合成中纳米颗粒生长的动力学。该过程由典型时间常数为103s的快速初始阶段和104s级时间常数的缓慢阶段组成。生长过程与CdSe的热基质合成类似，强调了两阶段生长机制的普遍性，无论基质类型和合成条件如何。然而，微乳液合成中各阶段的时间常数要比热基质合成大得多。同时，快时间常数和慢时间常数之间的比率明显更大。我们还证明，通过增加水与表面活性剂的比例获得更大尺寸的反胶束，通常会导致更大的CdSe纳米颗粒。双（三甲基硅基）硒是合成CdSe纳米粒子的关键前体。从理论上描述了限制二（三甲基硅基）硒生产的化学反应的中间阶段。
We first focus on the kinetics of nanoparticle growth in a microemulsion synthesis of CdSe semiconductor nanocrystals. The process consists of a fast initial stage of typical time constant of the order of 103 s followed by a slow stage of time constant of the order of 104s. Growth proceeds similarly to that described for the hot-matrix synthesis of CdSe, underlining the generality of the two-stage growth mechanism, irrespective of the matrix type and synthesis conditions. However, the time constant of each stage in the microemulsion synthesis is much larger than in the hot-matrix one. Also, the ratio between the fast and slow time constant is appreciably bigger. We also prove that larger size reverse micelles, obtained by increasing the water:surfactant ratio, generally lead to larger CdSe nanoparticles. Bis(trimethylsilyl) selenium is the crucial precursor for the CdSe nanoparticle synthesis. An intermediate stage of the chemical reaction limiting the bis(trimethylsilyl) selenium production is described theoretically.