表面增强拉曼散射信号在乙烯探测中面临的挑战:理论和实验方法

IF 2.4 3区 化学 Q2 SPECTROSCOPY
Isabela Bianchi-Carvalho, Cibely S. Martin, Gabriel G. B. Alves, Jaqueline N. Silva, Augusto Batagin-Neto, Carlos J. L. Constantino
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引用次数: 0

摘要

乙硫磷是一种广泛应用于水果和蔬菜的生长调节剂,因其毒性而需要仔细监测。然而,据我们所知,有关表面增强拉曼散射(SERS)乙硫磷检测的文献只有两篇。事实上,获得 SERS 信号具有挑战性。因此,我们利用理论(如密度泛函理论和电荷辅助片段相互作用)和实验方法评估了依替膦的 SERS 信号,以解决文献知识有限的问题。理论拉曼光谱显示,反应位点上的银原子或金原子通过 AgCl 键合增强了依替膦 SERS 信号,这与实验数据一致。为了获得 SERS 信号,采用了多种实验程序,包括 pH 值变化、加盐、激发激光线、时间依赖性和不同的 SERS 基底(银胶体和银岛薄膜)。加盐(NaCl)可以改善 SERS 信号,这与银胶体的聚集有关。在 Ag 胶体中进行的分析表明,使用新鲜制备的 Ag 胶体 + ethephon 分散液,将 ethephon 粉末直接溶解到 Ag 胶体中,pH 值为 7.0 是检测 ethephon 的最佳值。随着时间的推移,只有 AgCl 波段强度有所提高。银胶体(湿介质 - 633 纳米激光线)的性能优于银岛薄膜(干介质 - 785 纳米激光线)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Challenges in surface-enhanced Raman scattering signal for ethephon detection: Theoretical and experimental approaches

Challenges in surface-enhanced Raman scattering signal for ethephon detection: Theoretical and experimental approaches

Challenges in surface-enhanced Raman scattering signal for ethephon detection: Theoretical and experimental approaches

Ethephon, a widely used growth regulator in fruits and vegetables, requires careful monitoring because of its toxicity. However, as far as we know, only two works are found in the literature regarding surface-enhanced Raman scattering (SERS) ethephon detection. Indeed, obtaining the SERS signal revealed to be challenging. Therefore, we have evaluated the SERS signal of ethephon using theoretical (as density functional theory and charge-assisted fragment interaction) and experimental approaches, addressing this limited literature knowledge. Theoretical Raman spectra with Ag or Au atoms at reactive sites exhibited enhanced ethephon SERS signal via AgCl bonding, consistent with the experimental data. Multiple experimental procedures were employed to obtain the SERS signal, including pH variations, salt addition, excitation laser lines, time dependency, and different SERS substrates (Ag colloid and Ag island films). Salt addition (NaCl) improved SERS signal, correlating with Ag colloid aggregation. Analysis in Ag colloid showed the pH 7.0 as optimal for ethephon detection, using freshly prepared Ag colloid + ethephon dispersion with ethephon powder being directly dissolved into Ag colloid. Only the AgCl band intensity improved with time. Ag colloid (wet medium — 633 nm laser line) outperformed Ag island films (dry medium — 785 nm laser line).

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来源期刊
CiteScore
5.40
自引率
8.00%
发文量
185
审稿时长
3.0 months
期刊介绍: The Journal of Raman Spectroscopy is an international journal dedicated to the publication of original research at the cutting edge of all areas of science and technology related to Raman spectroscopy. The journal seeks to be the central forum for documenting the evolution of the broadly-defined field of Raman spectroscopy that includes an increasing number of rapidly developing techniques and an ever-widening array of interdisciplinary applications. Such topics include time-resolved, coherent and non-linear Raman spectroscopies, nanostructure-based surface-enhanced and tip-enhanced Raman spectroscopies of molecules, resonance Raman to investigate the structure-function relationships and dynamics of biological molecules, linear and nonlinear Raman imaging and microscopy, biomedical applications of Raman, theoretical formalism and advances in quantum computational methodology of all forms of Raman scattering, Raman spectroscopy in archaeology and art, advances in remote Raman sensing and industrial applications, and Raman optical activity of all classes of chiral molecules.
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