摘要
在AOT/正庚烷/氯金酸反相微乳液中,用水合肼作为还原剂制备了纳米金粒子,用紫外-可见光谱和透射电镜进行分析,系统地研究了水和表面活性剂摩尔比(ω=nH2O/nAOT)以及氯金酸浓度对粒径的影响。结果表明,制备的纳米金粒子粒径在4～12nm、单分散性好。纳米金粒径与ω值存在线性关系。氯金酸的浓度对粒径的影响比较复杂,随着浓度增大,粒径先减小后增大。用FT-IR红外光谱解释了AOT的磺酸基对纳米金粒子表面有强烈的吸附作用,从而对合成的纳米金粒子有着很强的保护作用。
Gold nanoparticles were prepared in W/O microemulsions of AOT/heptane/HAuCl4？3H2O system using N2H4？H2O as the reducing regent.These particles were characterized by UV-vis spectrum,TEM and FT-IR.The influences of the molar ratio of water to surfactant（ω=nH2O/nAOT） and the concentration of tetrachloroauric acid on the particle size were investigated.The results show that the average particle size of the prepared gold nanoparticles is from 4 nm to 12 nm,and their distribution is narrow.The relation between ω and average particles size is linearity.On the other hand,the influence of tetrachloroauric acid concentration is complex.As the concentration increases,the particle size decreases firstly and increases subsequently.FT-IR spectra indicate that the surfactant molecules are strongly absorbed on the surface of gold nanoparticles through a coordination bond between the gold atom and the sulfonic group of AOT molecules,so the surfactant AOT has a good protection effect.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第11期2055-2059,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(20673059和20573056)
教育部重点项目(WK0913002)
