Recyclable Ag-Deposited TiO2 SERS Substrate for Ultrasensitive Malachite Green Detection,ACS Omega

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Recyclable Ag-Deposited TiO2 SERS Substrate for Ultrasensitive Malachite Green Detection
ACS Omega ( IF 3.7 ) Pub Date : 2021-10-11 , DOI: 10.1021/acsomega.1c04082
Weiye Yang _{1,

2,

3} , Junqi Tang _{1,

2,

3} , Quanhong Ou _{1,

2,

3} , Xueqian Yan _{1,

2,

3} , Lei Liu _{1,

2,

3} , Yingkai Liu _{1,

2,

3}

Affiliation

An ultrasensitive Ag-deposited TiO₂ 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 TiO₂/Ag FLNMs. They exhibit ultrasensitivity (limit of detection (LOD) of MG reaches 4.47 × 10^–16 M) and high reproducibility (relative standard deviations (RSDs) are less than 13%); more importantly, the TiO₂/Ag FLNMs are recyclable, as enabled by their self-cleaning function due to TiO₂ 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 TiO₂ FLNMs. Therefore, TiO₂/Ag FLNMs show promising application in aquaculture.

中文翻译：

用于超灵敏孔雀石绿检测的可回收银沉积 TiO2 SERS 基板

通过水热法合成了一种超灵敏的银沉积 TiO ₂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粒子 (NPs)。广泛用于水产养殖的孔雀石绿 (MG) 用于评估 TiO ₂ /Ag FLNM的表面增强拉曼散射 (SERS) 特性。它们表现出超灵敏（MG 的检测限 (LOD) 达到 4.47 × 10 ^–16 M）和高重现性（相对标准偏差 (RSD) 小于 13%）；更重要的是，TiO ₂ /Ag FLNMs 是可回收的，因为 TiO ₂具有自清洁功能光催化降解。在三个循环后实现它们的可回收性，并在实际系统中检查它们的潜在应用。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 和 TiO ₂ FLNMs之间的耦合场。因此，TiO ₂ /Ag FLNMs 在水产养殖中具有广阔的应用前景。

更新日期：2021-10-19

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