用于超灵敏检测孔雀石绿的可回收银沉积二氧化钛表面增强拉曼散射基底

Recyclable Ag-Deposited TiO SERS Substrate for Ultrasensitive Malachite Green Detection.

作者信息

Yang Weiye, Tang Junqi, Ou Quanhong, Yan Xueqian, Liu Lei, Liu Yingkai

机构信息

Yunnan Key Laboratory of Opto-Electronic Information Technology, Yunnan Normal University, Kunming 650500, China.

Institute of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China.

出版信息

ACS Omega. 2021 Oct 11;6(41):27271-27278. doi: 10.1021/acsomega.1c04082. eCollection 2021 Oct 19.

An ultrasensitive Ag-deposited TiO flower-like nanomaterial (FLNM) surface-enhanced Raman scattering (SERS)-active substrate is synthesized via a hydrothermal method, and Ag nanoparticles (NPs) are deposited through electron beam evaporation. Malachite green (MG), which is widely used in aquaculture, is employed to assess the surface-enhanced Raman scattering (SERS) properties of TiO/Ag FLNMs. They exhibit ultrasensitivity (limit of detection (LOD) of MG reaches 4.47 × 10 M) and high reproducibility (relative standard deviations (RSDs) are less than 13%); more importantly, the TiO/Ag FLNMs are recyclable, as enabled by their self-cleaning function due to TiO photocatalytic degradation. Their recyclability is achieved after three cycles and their potential application is examined in the actual system. Finite difference time domain (FDTD) simulations and the charge-transfer (CT) mechanism further prove that the excellent SERS properties originate from localized surface plasmon resonance (LSPR) of Ag NPs and the coupling field between Ag and TiO FLNMs. Therefore, TiO/Ag FLNMs show promising application in aquaculture.

通过水热法合成了一种超灵敏的沉积银的TiO花状纳米材料（FLNM）表面增强拉曼散射（SERS）活性基底，并通过电子束蒸发沉积银纳米颗粒（NPs）。孔雀石绿（MG）广泛应用于水产养殖，用于评估TiO/Ag FLNMs的表面增强拉曼散射（SERS）特性。它们表现出超灵敏性（MG的检测限（LOD）达到4.47×10⁻¹¹ M）和高重现性（相对标准偏差（RSDs）小于13%）；更重要的是，由于TiO光催化降解的自清洁功能，TiO/Ag FLNMs具有可回收性。经过三个循环实现了它们的可回收性，并在实际系统中考察了其潜在应用。时域有限差分（FDTD）模拟和电荷转移（CT）机制进一步证明，优异的SERS特性源于Ag NPs的局域表面等离子体共振（LSPR）以及Ag与TiO FLNMs之间的耦合场。因此，TiO/Ag FLNMs在水产养殖中显示出有前景的应用。