Femtomolar detection of thiram via SERS using silver nanocubes as an efficient substrate,Environmental Science: Nano

当前位置： X-MOL 学术 › Environ. Sci.: Nano › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Femtomolar detection of thiram via SERS using silver nanocubes as an efficient substrate
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-11-12 , DOI: 10.1039/d0en01049a
M. B. Bhavya _{1,

2,

3,

4} , Ramya Prabhu B. _{4,

5,

6} , Bhamy Maithry Shenoy _{4,

7,

8,

9} , Prangya Bhol _{1,

2,

3,

4} , Swarnalata Swain _{1,

2,

3,

4} , Manav Saxena _{1,

2,

3,

4} , Neena S. John _{4,

5,

6} , Gopalkrishna Hegde _{4,

7,

8,

9} , Akshaya K. Samal _{1,

2,

3,

4}

Affiliation

Environmental remediation is a significant factor in maintaining a balance in nature. Pesticides are one of the main factors destroying nature by pollution and have hazardous effects on the environment and living systems. Thiram (TRM) is a fungicide used in agriculture and the rubber industry on a large scale. However, the excess use of TRM can cause harmful effects to living systems. Herein, silver nanocubes (Ag NCs) are demonstrated as an efficient substrate for the detection of TRM at ultra-low concentrations. Surface enhanced Raman scattering (SERS) is a highly sensitive technique employed for the ultra-low detection of TRM using Ag NCs. A shape-dependent comparative SERS study was carried out between Ag NCs and silver nanowires (Ag NWs), where different facets of the NCs and NWs were crucial for the creation of hotspots to enhance the detection limit. The enhancement factor (EF) for TRM with Ag NCs (TRM-Ag NCs) and TRM with Ag NWs (TRM-Ag NWs) was found to be 1.6 × 10⁶ and 4.5 × 10⁵, respectively. The Ag NCs showed a 3.55-folds higher enhancement compared to the Ag NWs. Theoretical studies were carried out using the finite element method (FEM) to identify the hotspots, leading to an EF in the SERS signal in the Ag NCs and NWs, and the results were consistent with the experimental observations. The limit of detection (LOD) achieved was as low as 10 fM (0.002 ppt) for TRM-Ag NCs and 1 nM (0.25 ppb) for TRM-Ag NWs, which is inevitably beneficial to human health preventing contamination in the environment.

中文翻译：

使用银纳米立方体作为有效底物通过SERS进行飞摩尔检测锡拉姆

环境修复是保持自然平衡的重要因素。农药是通过污染破坏自然的主要因素之一，对环境和生物系统具有有害影响。Thiram（TRM）是在农业和橡胶工业中大规模使用的杀菌剂。但是，过度使用TRM可能会对生命系统造成有害影响。本文中，银纳米立方体（Ag NCs）被证明是检测超低浓度TRM的有效底物。表面增强拉曼散射（SERS）是用于使用Ag NCs超低检测TRM的高灵敏度技术。在Ag NC和银纳米线（Ag NW）之间进行了形状依赖性的比较SERS研究，NC和NW的不同方面对于创建热点以提高检测限至关重要。发现带有Ag NCs的TRM（TRM-Ag NCs）和带有Ag NWs的TRM（TRM-Ag NWs）的增强因子（EF）为1.6×10⁶和4.5×10⁵。与Ag NWs相比，Ag NCs增强了3.55倍。使用有限元方法（FEM）进行了理论研究，以识别热点，从而导致Ag NCs和NWs中SERS信号出现EF，结果与实验观察结果一致。TRM-Ag NCs的检出限（LOD）低至10 fM（0.002 ppt），TRM-Ag NW的检出限低至1 nM（0.25 ppb），这不可避免地有益于人类健康，防止环境污染。

更新日期：2020-12-09

点击分享查看原文

点击收藏

阅读更多本刊最新论文