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High‐Performance SERS Substrate Based on Hierarchical 3D Cu Nanocrystals with Efficient Morphology Control
Author(s) -
Zhao Xiaohui,
Deng Min,
Rao Gaofeng,
Yan Yichao,
Wu Chunyang,
Jiao Yu,
Deng Anqing,
Yan Chaoyi,
Huang Jianwen,
Wu Songhao,
Chen Wei,
Lei Tianyu,
Xu Ping,
He Weidong,
Xiong Jie
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201802477
Subject(s) - nanocrystal , materials science , nanotechnology , substrate (aquarium) , raman scattering , morphology (biology) , plasmon , raman spectroscopy , colloid , chemical engineering , optoelectronics , optics , oceanography , physics , engineering , biology , genetics , geology
Cu nanocrystals of various shapes are synthesized via a universal, eco‐friendly, and facile colloidal method on Al substrates using hexadecylamine (HDA) as a capping agent and glucose as a reductant. By tuning the concentration of the capping agent, hierarchical 3D Cu nanocrystals show pronounced surface‐enhanced Raman scattering (SERS) through the concentrated hot spots at the sharp tips and gaps due to the unique 3D structure and the resulting plasmonic couplings. Intriguingly, 3D sword‐shaped Cu crystals have the highest enhancement factor (EF) because of their relatively uniform size distribution and alignment. This work opens new pathways for efficiently realizing morphology control for Cu nanocrystals as highly efficient SERS platforms.