Tunable porous silver nanostructures for efficient surface-enhanced Raman scattering detection of trace pesticide residues†,New Journal of Chemistry

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Tunable porous silver nanostructures for efficient surface-enhanced Raman scattering detection of trace pesticide residues†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-09-24 00:00:00 , DOI: 10.1039/c8nj04060e
Ruoxuan Jiang _{1,

2,

3} , Wei Xu _{1,

2,

3} , Yifang Wang _{2,

3,

4,

5} , Shaoming Yu _{2,

3,

4,

5}

Affiliation

Analytical methods based on surface-enhanced Raman scattering (SERS) suffer from a lack of reproducibility and reliability, thus limiting their practical applications. Herein, we explore a simple and rational strategy that allows the controllable design and synthesis of uniform porous nanostructures with adjustable porosity without a hard template. By varying the synthetic parameters, silver porous nanostructures were formed with tunable porosity ranging from 20 nm to 400 nm. The as-synthesized silver porous nanostructures could serve as an excellent enhancing substrate for SERS sensing, and the SERS intensities were dependent on the pore size of the Ag samples. The Ag porous nanostructures can be employed to detect rhodamine 6G with an enhancement factor of about 10¹⁴ and the pesticide thiram in commercial orange juice with a detection limit of as low as 0.1 μm (0.03 ppm), much lower than the maximum residue limit (MRL) of 7 ppm in fruit prescribed by the U.S. Environmental Protection Agency. Furthermore, spiked analysis indicated that the Ag porous nanostructures can be used to monitor thiram in commercial orange juice and natural lake water without further treatment. Therefore, the Ag porous nanostructure enhanced Raman spectroscopic technique offers wider practical applications for the on-site monitoring and assessment of pesticide residues in agricultural products and environments.

中文翻译：

可调谐的多孔银纳米结构，用于有效的表面增强拉曼散射检测痕量农药残留†

基于表面增强拉曼散射（SERS）的分析方法缺乏可重复性和可靠性，因此限制了它们的实际应用。在本文中，我们探索了一种简单合理的策略，无需硬模板即可控制设计和合成具有可调孔隙率的均匀多孔纳米结构。通过改变合成参数，形成具有20-400nm的可调孔隙率的银多孔纳米结构。合成后的银多孔纳米结构可以作为SERS感测的出色增强基板，并且SERS强度取决于Ag样品的孔径。Ag多孔纳米结构可用于检测罗丹明6G，增强因子约为10 ¹⁴商用橙汁中的杀虫剂thiram，检测限低至0.1μm（0.03 ppm），远低于美国环境保护局规定的水果中最大残留限量（MRL）7 ppm。此外，加标分析表明，Ag多孔纳米结构无需进一步处理即可用于监测商业橙汁和天然湖水中的硫胺素。因此，Ag多孔纳米结构增强拉曼光谱技术为农产品和环境中农药残留的现场监测和评估提供了更广泛的实际应用。

更新日期：2018-09-24

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