Asymmetric AgPd-AuNR heterostructure with enhanced photothermal performance and SERS activity

作者：Zhang, Han; Liu, Zeke; Kang, Xiaolin; Guo, Jun; Ma, Wanli; Cheng, Si^*

来源：Nanoscale, 2016, 8(4): 2242-2248.

DOI：10.1039/c5nr07333b

• NOBLE-METAL NANOSTRUCTURES
• GALVANIC REPLACEMENT
• HOLLOW NANOSTRUCTURES
• CATALYTIC-REACTIONS
• RAMAN-SPECTROSCOPY
• OPTICAL-PROPERTIES
• PD-AG
• GROWTH
• NANORODS
• NANOPARTICLES

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.

• 出版日期2016
• 单位苏州大学