In Situ Surface-Enhanced Raman Spectroscopy Detection of Uranyl Ions with Silver Nanorod-Decorated Tape

Surface-enhanced Raman spectroscopy (SERS) has been utilized for rapid analysis of uranyl ions (UO22+) on account of its fast response and high sensitivity. However, the difficulty of fabricating a suitable SERS substrate for in situ analysis of uranyl ions severely restricts its practical application. Hence, we proposed flexible and adhesive SERS tape decorated with silver nanorod (AgNR) arrays for in situ detection of UO22+. The SERS tape was fabricated through a simple "paste & peel off" procedure by transferring the slanted AgNR arrays from silicon to the transparent tape surface. UO22+ can be easily in situ detected by placing the AgNR SERS tape into an aqueous solution or pasting it onto the solid matrix surface due to the excellent transparent feature of the tape. The proposed SERS tape with well-distributed AgNRs effectively improved the reproducibility and sensitivity for UO22+ analysis. UO22+ with concentration as low as 100 nM was easily detected. Besides, UO22+ adsorbed on an iron disc and rock surface also can be rapidly in situ detected. With its simplicity and convenience, the AgNR SERS tape-based SERS technique offers a promising approach for environmental monitoring and nuclear accident emergency detection.

由于其快速响应和高灵敏度，已利用表面增强的拉曼光谱法（SERS）快速分析铀酰离子（UO22+）。但是，制造合适的SERS底物进行原位分析的难度严重限制了其实际应用。因此，我们提出了用银纳米棒（AGNR）阵列装饰的柔性和粘合剂胶带，用于原位检测UO22+。通过将倾斜的AGNR阵列从硅转移到透明的胶带表面，通过简单的“糊状和剥离”程序制造了SERS胶带。由于胶带的出色透明特征，将AGNR Sers胶带放入水溶液中或将其粘贴到实心基质表面上，可以轻松地原位检测到原位检测到。提出的具有良好分布AGNR的SERS胶带有效地提高了UO22+分析的可重复性和敏感性。浓度低至100 nm的UO22+很容易检测到。此外，在铁盘上吸附的UO22+也可以迅速检测到岩石表面。凭借其简单性和便利性，AGNR SERS磁带SERS技术为环境监测和核事故紧急检测提供了有希望的方法。