Polypyrrole Encapsulated Ferric Vanadate Nanorods Decorated with Palladium Nanoparticles for the Chemiresistive Detection of Indole Biomarker

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL Sensors and Actuators B: Chemical Pub Date : 2025-03-08 DOI:10.1016/j.snb.2025.137590

Xiaxia Xing, Zhenxu Li, Xinhua Zhao, Xiaoyu Chen, Xiaoyan Lang, Yi Zhang, Dachi Yang

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Abstract

Escherichia coli (E. coli) as a pathogenic bacterium may cause food contamination and foodborne diseases, it is desired to develop a facile way such as newly-emerged gas sensing detection of indole biomarker to indirectly monitor E. coli. Here, we report an advanced indole sensing built with polypyrrole encapsulated ferric vanadate nanorods decorated with palladium nanoparticles (Pd@FeVO₄-ppy). Experimentally, the Pd@FeVO₄-ppy nanocomposites (NCPs) have been synthesized by combined microwave hydrothermal and subsequent doping, which are observed of porous FeVO₄ nanorods decorated with Pd and ppy nanoparticles (NPs). Beneficially, the sensor prototypes with Pd@FeVO₄-ppy NCPs show selective and stable sensing response to 1-50 ppm indole. Meanwhile, high temperature and humidity dependence of indole sensing have been investigated. Theoretically, the sensing resistance variations of Pd@FeVO₄-ppy NCPs is interpreted as the redox reaction between chemisorbed oxygen and indole, the decoration of Pd and ppy NPs increased active oxygen species and electron transfer. Practically, the Pd@FeVO₄-ppy NCPs sensor prototype has been simulated for detection of indole and has been communicated with a smartphone, showing the potential in monitoring E. coli.

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大肠埃希氏菌（E. coli）作为一种致病菌可能会导致食品污染和食源性疾病，因此人们希望开发一种简便的方法，如新出现的吲哚生物标志物气敏检测法来间接监测大肠埃希氏菌。在此，我们报告了一种先进的吲哚传感技术，它是用钯纳米粒子装饰的聚吡咯封装钒酸铁纳米棒（Pd@FeVO4-ppy）构建的。实验中，Pd@FeVO4-ppy 纳米复合材料（NCPs）是通过联合微波水热法和后续掺杂法合成的。具有 Pd@FeVO4-ppy NCPs 的传感器原型对 1-50 ppm 的吲哚具有选择性和稳定的传感响应。同时，还研究了吲哚传感的高温和湿度依赖性。理论上，Pd@FeVO4-ppy NCPs 的传感电阻变化被解释为化学吸附氧与吲哚之间的氧化还原反应，Pd 和 ppy NPs 的装饰增加了活性氧物种和电子传递。实际上，Pd@FeVO4-ppy NCPs 传感器原型已被模拟用于检测吲哚，并与智能手机进行了通信，显示了其在监测大肠杆菌方面的潜力。

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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.