UiO-66@TiO2/Au heterojunction-like SERS substrate based on adsorption-induced aggregation for detection of thiamethoxam and triazophos in apple juice

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-02-05 DOI:10.1016/j.snb.2025.137398

Shengqiao Gao, Qingyi Wei, Hongbin Pu

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引用次数: 0

Abstract

Heterojunction-like substrates have drawn significant attention in surface enhanced Raman spectroscopy (SERS) owing to their multi-enhancement characteristics. In this study, the core-shell architectures of UiO-66@ TiO₂ were fabricated for capture and enrichment of organophosphorus pesticides (OPs) in solution. After absorption of OPs, the SERS-active nanoparticles of Au were assembled on the core-shell architectures to form UiO-66@TiO₂/Au substrate via Au-S bonding between OPs molecule and AuNPs and electrostatic interactions between UiO-66@TiO₂ and Au, resulting in adsorption-induced aggregation of Raman signal for OPs. The proposed method of adsorption-induced aggregation could be used for detecting thiamethoxam and triazophos in apple juice with detection limit of 3.51 μg/L and 0.66 μg/L, respectively. Furthermore, the satisfactory recovery rates, ranging from 91.98% to 104.31% for thiamethoxam and from 91.47% to 116.47% for triazophos, indicated that the prepared heterojunction-like substrate could be potentially used for trace detecting OPs in foods.

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由于具有多重增强特性，异质结类基底在表面增强拉曼光谱（SERS）中备受关注。本研究制备了 UiO-66@ TiO2 核壳结构，用于捕获和富集溶液中的有机磷农药（OPs）。吸收 OPs 后，通过 OPs 分子与 AuNPs 之间的 Au-S 键以及 UiO-66@TiO2 与 Au 之间的静电作用，Au 的 SERS 活性纳米粒子在核壳结构上组装成 UiO-66@TiO₂/Au 基底，从而产生吸附诱导的 OPs 拉曼信号聚集。所提出的吸附诱导聚集法可用于检测苹果汁中的噻虫嗪和三唑磷，检测限分别为 3.51 μg/L 和 0.66 μg/L。此外，噻虫嗪和三唑磷的回收率分别为 91.98% 至 104.31%和 91.47% 至 116.47%，这表明所制备的异质结类底物可用于食品中 OPs 的痕量检测。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.