Electrochemical Synthesis of Red Fluorescent Silicon Nanoparticles
Electrochemical Synthesis of Red Fluorescent Silicon Nanoparticles
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DOI：
10.5012/bkcs.2014.35.1.35
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发表时间：
2014-01-20
影响因子：
1.7
通讯作者：
Lee, Kwan Hyi
中科院分区：
文献类型：
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作者：
Choi, Jonghoon;Kim, Kyobum;Lee, Kwan Hyi
本文报道了苯乙烯稳定的红色荧光硅纳米颗粒的制备。纳米级硅粒子在紫外激发下发出荧光，在光学和半导体研究领域开辟了新的应用前景。不幸的是，制备红色荧光硅纳米颗粒的传统方法缺乏完全建立的标准合成方案。在半导体制备过程中，一种常见的初始方法是在HF/乙醇/H2O浴中蚀刻晶体硅片，这提供了一个均匀蚀刻的纳米孔表面，可以通过调整各种参数进行进一步的纳米级修饰。随后对蚀刻表面进行超声处理，使晶圆片上的孔隙破碎，导致颗粒分散到溶液中。在这项研究中，我们使用苯乙烯占据这些平台来稳定表面。我们确定乙醇溶液中释放的硅颗粒与苯乙烯相互作用，导致Si-H键被Si-C键取代，这是通过紫外光催化测定的。合成的苯乙烯包覆硅纳米颗粒在365 nm紫外光激发下表现出稳定、明亮的红色荧光，在2小时的合成时间内，每片晶片的产率约为100 mg。我们相信该方案可以进一步扩展为制备红色荧光硅纳米颗粒的成本效益和高通量标准方法。
Herein, we report on the preparation of red fluorescent Si nanoparticles stabilized with styrene. Nano-sized Si particles emit fluorescence under UV excitation, which could be used to open up new applications in the fields of optics and semi-conductor research. Unfortunately, conventional methods for the preparation of red fluorescent Si nanoparticles suffer from the lack of a fully-established standard synthesis protocol. A common initial approach during the preparation of semi-conductors is the etching of crystalline Si wafers in a HF/ethanol/H2O bath, which provides a uniformly-etched surface of nanopores amenable for further nano-sized modifications via tuning of various parameters. Subsequent sonication of the etched surface crumbles the pores on the wafer, resulting in the dispersion of particles into the solution. In this study, we use styrene to occupy these platforms to stabilize the surface. We determine that the liberated silicon particles in ethanol solution interact with styrene, resulting in the substitution of Si-H bonds with those of Si-C as determined via UV photocatalysis. The synthesized styrene-coated Si nanoparticles exhibit a stable, bright, red fluorescence under excitation with a 365 nm UV light, and yield approximately 100 mg per wafer with a synthesis time of 2 h. We believe this protocol could be further expanded as a cost-effective and high-throughput standard method in the preparation of red fluorescent Si nanoparticles.