不同粒径银纳米粒子本征手性的研究  

Effect of size on intrinsic chirality of silver nanoparticles

作　　者：张桂萍 张淼 刘庆媛 李保新[1] Guiping Zhang;Miao Zhang;Qingyuan Liu;Baoxin Li(Key Laboratory of Applied Surface and Colloid Chemistry,Ministry of Education,Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province,School of Chemistry&Chemical Engineering,Shaanxi Normal University,Xi’an 710062,China)

机构地区：[1]陕西师范大学化学与化工学院,应用表面与胶体化学教育部重点实验室,陕西省生命分析化学重点实验室,西安710062

出　　处：《中国科学：化学》2024年第10期1920-1926,共7页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:22274094)资助项目。

摘　　要：本文利用柠檬酸-单宁酸还原法制备了一系列不同粒径的银纳米粒子(AgNPs).通过圆二色(CD)光谱对所得AgNPs的手性进行表征.实验发现,小粒径AgNPs(~11nm)表现出与大粒径AuNPs(>32nm)相反的手性.根据这一性质,将不同尺寸的AgNPs应用于酒石酸对映体的识别.用高分辨透射电子显微镜表征了不同粒径AgNPs的形貌,发现所制备的AuNPs均为五重孪晶.仔细对比了小粒径AgNPs和大粒径AgNPs的孪晶结构,发现五重孪晶AgNPs的晶面种类和晶格取向可能是AgNPs内在手性的产生原因.本文将有助于加深对贵金属纳米粒子内在手性的理解,为设计和制备纳米手性探针提供了一定的有益参考.In this work,we use the citric acid-tannic acid reduction method to prepare silver nanoparticles(AgNPs) with different sizes.Characterize the chirality of the obtained AgNPs by circular dichroism(CD) spectroscopy.The experiment found that small AgNPs(~11 nm) exhibited opposite chirality to large AgNPs(>32 nm).Based on this property,AgNPs of different sizes were applied for the recognition of tartaric acid enantiomers.The morphology of AgNPs with different sizes was characterized by high-resolution transmission electron microscopy,and it was found that the prepared AgNPs were all pentagonal twins.The type of crystal planes and lattice orientation of the pentagonal twin AgNPs may be the reason for the intrinsic chirality of AgNPs.This article will help deepen us understanding of the intrinsic chirality of precious metal nanoparticles and provide useful references for the design and preparation of nano chiral probes.

关 键 词：银纳米粒子 内在手性 粒径 手性识别 

分 类 号：TB383.1[一般工业技术—材料科学与工程]