L-半胱氨酸诱导单晶银纳米线的快速合成及表征

Rapid synthesis and characterization of silver nanowires with single crystal structure by chemical reduction induced by L-cysteine

采用化学还原法,以聚乙烯砒咯烷酮(PVP)为稳定剂和形貌控制剂,乙二醇为还原剂,在L-半胱氨酸诱导下,由硝酸银快速制备了银纳米线。采用紫外-可见吸收光谱、X射线衍射、扫描电子显微镜、选区电子衍射和透射电子显微镜手段对所得产物进行表征,结果表明利用L-半胱氨酸诱导可在15min内制备直径为100nm左右,长度约几百微米的银纳米线,并具有单晶结构,根据实验结果提出了可能的银纳米线快速合成机理。

Well-defined silver nanowires with uniform diameter and length were successfully and rapidly synthe- sized from silver nitrate by a typical chemical reduction method induced by L-cysteine using poly （vinyl pyrroli- done） （PVP） as the surfaetant agent and ethylene glycol as reducing agent. The obtained specimen were inves- tigated by UV-visible absorption speetrum（UV）, X-ray powder diffraction （XRD）, scanning electron microsco- py （SEM）, seleeted area electron diffraction （SAED）, transmission electron microscopy （TEM） and high reso- lution transmission electron microscopy （HRTEM）. The results indicated that silver nanowires with uniform diameter of about 100nm and length of several hundred micrometers could be successfully obtained within 15rain. The as synthesized silver nanowires showed single crystal structure. The possible rapid synthesis mech- anism induced bv L-cvsteino was also demonstrated according to the experiment results.