尺寸比例可调的Au-Ni双金属纳米颗粒的制备  

Synthesis of Au-Ni Bimetallic Nanoparticles with Tunable Aspect Ratio

作　　者：韩天昊 梁福鑫[1] 杨振忠[1] HAN Tianhao LIANG Fuxin YANG Zhenzhong(State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China)

机构地区：[1]中国科学院化学研究所,高分子物理与化学国家重点实验室,北京100190

出　　处：《高等学校化学学报》2017年第11期1921-1926,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51233007)资助~~

摘　　要：本文采用贵金属诱导还原法制备了一种Ni端尺寸可调的Au-Ni双金属纳米颗粒.该反应以十八胺为还原剂,硝酸镍和氯金酸为反应物,反应中Au3+首先被还原成Au0,随着温度上升,Ni2+从Au0获得电子而被还原成Ni0,十八胺持续提供电子,得到了雪人状的Au-Ni双金属纳米颗粒.采用I2/KI水溶液和0.5%(质量分数)盐酸分别对Au端和Ni端进行择性蚀刻,通过调节蚀刻时间,连续调控两端尺寸,可以达到完全刻蚀,最终制备了一种两端尺寸比例连续可调的Au-Ni双金属纳米颗粒.蚀刻后得到的新鲜表面为进一步功能复合提供了反应场所.In this paper,the Au-Ni bimetallic nanoparticles with tunable aspect ratio of Au to Ni were synthesized by noble-metal-induced-reduction strategy. Octadecylamine is reducible at high temperatures thus it was used as a reducing agent. As the temperature increased gradually,Au3＋was reduced by octadecylamine to form Au0. After that,Ni2＋was reduced to Ni0 by obtaining electrons from Au0 at 220 ℃. Octadecylamine provided electrons to Au3＋continuously during the reaction. The size of Ni side could be tunable by changing the reaction time at 220 ℃. Au side and Ni side could be selectively etched with aqueous I2/KI and 0. 5%（mass fraction） aqueous HCl,respectively. The size of Au-Ni bimetallic nanoparticles could be tuned continuously by etching for varied time. Au side or Ni side could be completely etched separately,remaining Ni nanoparticles or Au nanoparticles. The fresh surface obtained after etching Au side or Ni side provided a site of chemical reaction for further compositing functional substances. This method is attractive owing to the easiness to continuously tuning aspect ratio of the bimetallic nanoparticles. On the other hand, composition of the bimetallic nanoparticles is also flexibly tunable using different reactants.

关 键 词：双金属纳米颗粒 反应时间 选择性刻蚀 结构调控 

分 类 号：O614[理学—无机化学]