飞秒激光烧蚀氯金酸水溶液制备金纳米粒子

发布时间：2018-01-13 00:33

本文关键词：飞秒激光烧蚀氯金酸水溶液制备金纳米粒子　出处：《中国激光》2017年08期 　论文类型：期刊论文

【摘要】：利用波长为800nm、脉宽为30fs的脉冲激光聚焦后烧蚀氯金酸(HAuCl4·3H2O)水溶液制备了金纳米粒子,借助紫外-可见吸收光谱、透射电镜形貌、X射线衍射谱和选区电子衍射谱分析了氯金酸水溶液浓度、激光脉冲能量和分散剂聚乙烯吡咯烷酮(PVP)添加量等对金纳米粒子粒径及其分布的影响。实验结果表明:金纳米粒子的表面等离子体共振吸收峰约在530nm波长处;在其他条件不变的条件下,较低的溶液浓度、较高的激光能量和较高的PVP添加量有利于获得粒径较小、粒径变化范围较窄且分散性较高的金纳米粒子;制备的金纳米粒子绝大多数为球形,并具有多晶结构,金纳米晶体的(111)、(200)、(220)和(311)晶面都有较强的X射线衍射峰;金纳米粒子的生长过程分为团聚和吸附两个阶段。
[Abstract]:Gold nanoparticles were prepared by pulsed laser focusing at 800 nm and pulse width of 30 fs after ablation of HAuCl _ 4 路3H _ 2O solution. The concentration of chloruronic acid in aqueous solution was analyzed by X-ray diffraction and selected area electron diffraction. Laser pulse energy and dispersant polyvinylpyrrolidone (PVP). The experimental results show that the surface plasmon resonance absorption peak of gold nanoparticles is about 530 nm. Under other conditions, the lower solution concentration, the higher laser energy and the higher PVP content are favorable for the preparation of gold nanoparticles with smaller particle size, narrower range of particle size variation and higher dispersion. Most of the prepared gold nanoparticles are spherical and have polycrystalline structure. The crystal faces of gold nanocrystalline are characterized by strong X-ray diffraction peaks. The growth process of gold nanoparticles can be divided into two stages: agglomeration and adsorption.
【作者单位】：安徽理工大学土木建筑学院;安徽师范大学原子与分子物理研究所;安徽理工大学材料科学与工程学院;
【基金】：安徽省自然科学基金(1608085ME117) 国家自然科学基金青年基金(51404012)
【分类号】：O614.123;TB383.1;TN249
【正文快照】： 0803003-1近年来,贵金属纳米粒子以其独特的性质引起了研究人员的极大关注,并在生物[1-3]、催化[4-5]、传感[6-9]和医学[10-11]等领域都有重要应用。例如,金纳米粒子可以应用在光学成像[12-13]以及表面增强拉曼光谱(SERS)[14-15]等分析技术中;金纳米粒子的尺寸会对其催化活性

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