Influence of citric acid on the optical properties of folic acid-derived amorphous carbon nanoparticles and detection of triethylamine

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Applied Physics A Pub Date : 2025-01-14 DOI:10.1007/s00339-025-08248-w
Guohua Cao, Yongchao Li, Yuehong Yin, Yuncai Yu, Youfu Xiong, Shujun Wu, Junjun Wang, Baoqing Zhang
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Abstract

Carbon nanoparticles (CNPs) with unique photoluminescence properties have promising potential for detecting volatile organic compounds. In this work, employing folic acid as the carbon source and citric acid as the surface modifier, blue fluorescent CNPs were synthesized using a simple and inexpensive hydrothermal method. These CNPs feature an amorphous carbon structure and present a reduced size of 24 nm and an increased presence of carbonyl groups on their surface owing to the incorporation of citric acid, demonstrating enhanced surface defect states and exhibiting excitation-dependent fluorescence behavior. The citric acid-assisted composite CNPs exhibit excellent optical selectivity towards triethylamine (TEA), with a particularly optical response, enhancing at low concentrations and quenching at high concentrations. The synergistic effect of electron transfer results in high sensitivity and a low detection limit of 0.28 µM. The synthesized CNPs serve as fluorescent probes for TEA in an aqueous medium. The detection mechanism of citric acid-assisted CNPs is explored in detail.

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柠檬酸对叶酸衍生的无定形纳米碳光学性质的影响及三乙胺的检测
碳纳米颗粒具有独特的光致发光特性,在检测挥发性有机化合物方面具有广阔的应用前景。本文以叶酸为碳源,柠檬酸为表面改性剂,采用简单、廉价的水热法制备了蓝色荧光CNPs。这些CNPs具有无定形碳结构,并且由于柠檬酸的掺入,其尺寸减小到24 nm,表面羰基的存在增加,表现出增强的表面缺陷状态,并表现出依赖于激发的荧光行为。柠檬酸辅助合成的CNPs对三乙胺(TEA)具有优异的光学选择性,其光学响应在低浓度下增强,在高浓度下猝灭。电子转移的协同效应使得该方法灵敏度高,检出限低,仅为0.28µM。合成的CNPs作为水介质中TEA的荧光探针。详细探讨了柠檬酸辅助CNPs的检测机理。
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来源期刊
Applied Physics A
Applied Physics A 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.40%
发文量
964
审稿时长
38 days
期刊介绍: Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.
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