Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China.
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, China.
Nanoscale. 2016 Jun 2;8(22):11487-93. doi: 10.1039/c6nr03285k.
Surface-enhanced Raman spectroscopy (SERS) substrates based on plasmonic nanostructures allow for label-free and fingerprinting molecular detection with ultrahigh sensitivity and selectivity, but their complicated and high-cost fabrication remains a challenge for practical applications and commercialization of SERS technology. Herein, we developed a facile and low-cost natural SERS substrate based on silver coated taro leaf (Taro-leaf@Ag) that exhibits ordered micro-papillae and secondary crossed nanoplates. The micro-papillae exhibited superior superhydrophobicity for analyte enrichment and the secondary crossed nanoplates provided rich SERS hot spots, which together lead to highly sensitive SERS detection with a detection limit as low as 10(-8) M. Moreover, the crossed nanoplates were uniformly distributed such that reproducible SERS measurements with a 9.7% variation over 1274 spectra was achieved. The high SERS sensitivity and reproducibility as well as the facile and low-cost fabrication make the Taro-leaf@Ag a promising natural SERS substrate for future practical biochemical detection methods.
基于等离子体纳米结构的表面增强拉曼光谱（SERS）基底允许进行无标记和指纹分子检测，具有超高的灵敏度和选择性，但它们复杂且昂贵的制造仍然是 SERS 技术实际应用和商业化的挑战。在此，我们开发了一种基于涂银芋头叶（Taro-leaf@Ag）的简便且低成本的天然 SERS 基底，其具有有序的微乳头和二级交叉纳米板。微乳头表现出优异的超疏水性，有利于分析物的富集，而二级交叉纳米板提供了丰富的 SERS 热点，这两者共同导致了具有低至 10^(-8) M 的检测极限的高灵敏度 SERS 检测。此外，交叉纳米板均匀分布，使得在 1274 个光谱中实现了 9.7%变化的可重复 SERS 测量。高的 SERS 灵敏度和重现性以及简便和低成本的制造使得 Taro-leaf@Ag 成为未来实用生化检测方法有前途的天然 SERS 基底。
