Asymmetric AgPd–AuNR heterostructure with enhanced photothermal performance and SERS activity
Han Zhang Zeke Liu Xiaolin Kang Jun Guo Wanli MaSi Cheng
a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China
b Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, China
c Testing & Analysis Center, Soochow University, Suzhou, China
Nanoscale, 2016,8, 2242-2248
Most as-reported nanostructures through galvanic replacement reactions are still symmetric hollow structures, until now. Asymmetric structures fabricated through a galvanic replacement reaction have been rarely reported. However, asymmetric heterostructures can generally lead to new intriguing properties through asymmetric synergistic coupling. Here, we report a simple synthesis of an asymmetric one-ended AgPd bimetal on Au nanorods (AuNR) by combining a galvanic replacement reaction with an Ostwald ripening process. The morphological evolution from a nanodumbbell to a dandelion structure is thoroughly investigated. The unique asymmetric AgPd–AuNR heterostructures possess the required plasmonic performance and avoid strong damping caused by the poor plasmonic metal Pd, resulting in a superior photothermal heating performance and enhanced SERS sensitivity for in situ monitoring of a catalytic reaction compared with the symmetric counterparts.
链接：//pubs.rsc.org/en/content/articlelanding/2016/nr/c5nr07333b#!divAbstract
