The effect of alkyl chain length on the level of capping of silicon nanoparticles produced by a one-pot synthesis route based on the chemical reduction of micelle
The effect of alkyl chain length on the level of capping of silicon nanoparticles produced by a one-pot synthesis route based on the chemical reduction of micelle
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DOI：
10.1007/s11051-013-1425-8
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发表时间：
2013-02-01
影响因子：
2.5
通讯作者：
Chao, Yimin
中科院分区：
文献类型：
--
作者：
Ashby, Shane P.;Thomas, Jason A.;Chao, Yimin
硅纳米颗粒（SiNP）可以通过多种方法合成。在许多情况下，这些例程不可扩展，产品收率低，或者使用有毒试剂。克服这些缺点的一种方法是使用基于胶束化学还原的一锅合成。在以下研究中，使用不同链长的三氯烷基硅烷作为表面活性剂，并研究了封端水平、表面键合和形成的纳米粒子的尺寸。 FTIR 结果表明，具有不同封端层的 SiNP 的烷基封端程度是恒定的，尽管由于该方法中使用的乙醇与颗粒上未封端位点的反应，与较短链结合的 SiNP 显示出更高水平的 Si-O。具有较长链长封端的 SiNP 在 FTIR 上显示出尖锐的 Si-H 峰，将它们与相应的 1-烯烃一起回流加热以完全封端这些颗粒，导致该峰减少/消失，而 Si-O 峰强度变化最小。用于分析表面键合和组成的其他技术、XPS、H-1-NMR 和 TEM/EDX 表明，使用该方法生产了烷基封端的 SiNP。不同封端 SiNP 之间的光学特性没有显示出显着变化。
Silicon nanoparticles (SiNPs) can be synthesized by a variety of methods. In many cases these routines are non-scalable with low product yields or employ toxic reagents. One way to overcome these drawbacks is to use one-pot synthesis based on the chemical reduction of micelles. In the following study trichloroalkylsilanes of differing chain lengths were used as a surfactant, and the level of capping, surface bonding and size of the nanoparticles formed has been investigated. FTIR results show that the degree of alkyl capping for SiNPs with different capping layers was constant, although SiNPs bound with shorter chains display a much higher level of Si-O owing to the reaction of the ethanol used in the method with uncapped sites on the particle. SiNPs with longer chain length capping show a sharp Si-H peak on the FTIR, these were heated at reflux with the corresponding 1-alkene to fully cap these particles, resulting in a reduction/disappearance of this peak with a minimal change in the intensity of the Si-O peak. Other techniques used to analyze the surface bonding and composition, XPS, H-1-NMR, and TEM/EDX, show that alkyl-capped SiNPs have been produced using this method. The optical properties showed no significant changes between the different capped SiNPs.