Electrochemical Synthesis of Red Fluorescent Silicon Nanoparticles
- Electrochemical Synthesis of Red Fluorescent Silicon Nanoparticles
- Jonghoon Choi; Kyobum Kim; 한형섭; 황민태; 이관희
- silicon; nanoparticle; styrene; surface functionalization; fluorescence
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 35, NO 1, 35-38
- 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.
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