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Post-treatment of silicon nanocrystals produced by ultra-short pulsed laser ablation in liquid: Toward blue luminescent nanocrystal generation

机译：液体中超短脉冲激光烧蚀产生的硅纳米晶体的后处理：产生蓝色发光纳米晶体

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Blue luminescent colloidal silicon nanocrystals (Si-NCs) were produced in a two-stage process. In the first step, synthesis of Si-NCs was achieved by femtosecond pulsed laser ablation of a silicon wafer, which was immersed in deionized water. The size and the structural and the chemical characteristics of colloidal Si-NCs were investigated by TEM and EDAX analyses, and it is found out that the Si-NCs are in spherical shape and the particle diameters are in the range of 5-100 nm. In the second step, ultrasonic waves and filtering chemical-free post-treatment of colloidal Si-NCs solution was performed to reduce the particle size. High-resolution TEM (HRTEM) studies on post-treated colloidal solution clearly show that small (1-5.5 nm in diameter) Si-NCs were successfully produced. Raman spectroscopy results clearly confirms the generation of Si nanoparticles in the crystalline nature, and the Raman scattering study of post-treated Si-NCs confirms the reduction of the particle size. The UV-vis absorption and photoluminescence (PL) spectroscopy studies elucidate the quantum confinement effect of Si-NCs on the optical properties. The colloidal Si-NCs and post-treated Si-NCs solutions present strong absorption edge shifts toward UV region. Broadband PL emission behavior is observed for the initial colloidal Si-NCs, and the PL spectrum of post-treated Si-NCs presents a blue-shifted broadband PL emission behavior due to the particle size reduction effect. © 2012 American Chemical Society.
机译：蓝色发光胶体硅纳米晶体（Si-NCs）的生产过程分为两步。第一步，通过飞秒脉冲激光烧蚀硅片，然后浸入去离子水中，实现Si-NC的合成。通过TEM和EDAX分析研究了胶体Si-NC的尺寸，结构和化学特性，发现Si-NC为球形，粒径为5-100 nm。第二步，进行超声波和胶体Si-NCs溶液的无过滤后处理，以减小粒径。对后处理的胶体溶液进行的高分辨率TEM（HRTEM）研究清楚地表明，成功生产了小（直径为1-5.5 nm）的Si-NC。拉曼光谱学结果清楚地证实了晶体性质的Si纳米颗粒的产生，后处理的Si-NC的拉曼散射研究证实了粒径的减小。紫外可见吸收和光致发光（PL）光谱研究阐明了Si-NCs对光学性质的量子限制效应。胶态Si-NCs和后处理的Si-NCs溶液呈现出很强的吸收边向UV区的偏移。对于最初的胶体Si-NC，观察到宽带PL发射行为，并且由于粒径减小效应，后处理的Si-NC的PL光谱呈现蓝移的宽带PL发射行为。 ©2012美国化学学会。

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