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。
Gold nanoparticles are prepared in chloroauric acid trihydrate （HAuCl4·3H2O） aqueous solution by the ablation with a focused femtosecond pulse laser beam of 800 nm wavelength and 30 fs pulse duration. The effects of HAuCl4 - 3H2O aqueous solution concentration, laser pulse energy and dispersant polyvinyl pyrrolidone （PVP） amount on particle size and size distribution of gold nanoparticles are investigated by means of UV-Vis absorption spectrum, transmission electron microscopic morphology, X-ray diffraction spectrum, and selected area electron diffraction pattern. The results show that the surface plasma resonance absorption peak of the gold nanoparticles locates around 530 nm. Lower solution concentration, higher laser pulse energy and higher PVP amount are helpful to obtain nanoparticles with smaller average particle size, narrower particle size range and higher dispersion when other experimental parameters are fixed at certain values. The prepared particles are mostly spherical and display muhi-nanocrystal surface structure. The strong X-ray diffraction peaks of （111）, （200）, （220） and （311） crystal planes of gold nanocrystal are observed. The growth process of gold nanoparticle includes aggregation stage and adsorption stage.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第8期160-168,共9页
Chinese Journal of Lasers
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)
关键词
材料
激光技术
飞秒激光
金纳米粒子
氯金酸
materials
laser technique
femtosecond laser
gold nanoparticle
chloroauric acid trihydrate
