Bionic SERS chip with super-hydrophobic and plasmonic micro/nano dual structure
Natural surface-enhanced Raman spectroscopy (SERS) chips based on plants or insects have gained increased attention due to their facile characteristics and low costs. However, such chips remain a major challenge for practical application because of poor reproducibility and stability as well as unavoidable damage to the surface structure during coating metal and uncontrolled dehydration. By using a simple wrinkling method, we develop a new route to fabricate a low-cost bionic SERS chip for practical detection. Inspired by the taro leaf, we fabricate a SERS chip with a super-hydrophobic and plasmonic micro/nano dual structure, and its structure parameters can be optimized. Compared with the natural taro-leaf SERS chip, our artificial chip exhibits Raman signals with an order of magnitude higher sensitivity (～10?9 M) and enhancement factor (～107) under the illumination of weak laser radiation, demonstrating that our SERS chip has great potential in biological detection. The excellent performances of our bionic SERS chip are attributed to a synergy of optimized micro-wrinkle and nano-nest, which is verified by experiment and simulation. We believe our bionic chip could be a promising candidate in practical application due to its merits such as simple fabricating process, optimizable structure, low cost, excellent homogeneity, high sensitivity, and stability.
基金项目：National Key Research and Development Program of China (2016YFA0200403); CAS Strategy Pilot Program (XDA 09020300); Eu-FP7 Project (247644); National Natural Science Foundation of China (NSFC)10.13039/501100001809 (10974037, 61505038).
Haoran Zhang：CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China
Huimin Feng：CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China
Jianjie Dong：CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
Chuang Wang：CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China
Qian Liu：CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, ChinaMOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute, School of Physics, Nankai University, Tianjin 300457, China
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Fengyou Yang, Haoran Zhang, Huimin Feng, Jianjie Dong, Chuang Wang, and Qian Liu, "Bionic SERS chip with super-hydrophobic and plasmonic micro/nano dual structure," Photonics Research 6(2), 77-83 (2018)