Graphene quantum dot-enabled dual-modal fluorescence/ colorimetry detection of formaldehyde

Environmental Functional Materials Pub Date : 2026-04-01 Epub Date: 2025-11-19 DOI:10.1016/j.efmat.2025.11.002

Shu-hui Huo, Nan Yang, Mengya Qin, Xiaonan Zhang, Junhao Liu, Penggang Lang, Xiaohui Deng, Pengxin Zhou, Zhengang Han, Yanjun Feng, Zhilan Wang, Xiaoquan Lu

{"title":"Graphene quantum dot-enabled dual-modal fluorescence/ colorimetry detection of formaldehyde","authors":"Shu-hui Huo, Nan Yang, Mengya Qin, Xiaonan Zhang, Junhao Liu, Penggang Lang, Xiaohui Deng, Pengxin Zhou, Zhengang Han, Yanjun Feng, Zhilan Wang, Xiaoquan Lu","doi":"10.1016/j.efmat.2025.11.002","DOIUrl":null,"url":null,"abstract":"<div><div>While methods for gaseous formaldehyde (HCHO) detection are well-established, rapid and sensitive sensing in aqueous matrices remains a challenge. To address this gap, we developed a dual-mode sensing platform based on a nitrogen-doped graphene quantum dots/o-phenylenediamine-Ag<sup>+</sup> (NGQD/OPD-Ag<sup>+</sup>) system for HCHO analysis in aqueous matrices. In this system, Ag<sup>+</sup> catalyzes the oxidation of OPD, whose product quenches NGQD fluorescence via a FRET mechanism. The presence of HCHO inhibits this oxidation, resulting in complementary ratiometric fluorescence and colorimetric signal changes. This method achieved high sensitivity with detection limits of 0.54 μM (fluorescence) and 1.33 μM (colorimetry), excellent selectivity, and was successfully applied for the visual detection of HCHO in real water samples using a smartphone-integrated paper sensor. This work provides a robust and practical solution for rapid on-site monitoring of HCHO in aqueous matrices.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"5 1","pages":"Pages 56-64"},"PeriodicalIF":0.0000,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Functional Materials","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2773058125000250","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/11/19 0:00:00","PubModel":"Epub","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

While methods for gaseous formaldehyde (HCHO) detection are well-established, rapid and sensitive sensing in aqueous matrices remains a challenge. To address this gap, we developed a dual-mode sensing platform based on a nitrogen-doped graphene quantum dots/o-phenylenediamine-Ag⁺ (NGQD/OPD-Ag⁺) system for HCHO analysis in aqueous matrices. In this system, Ag⁺ catalyzes the oxidation of OPD, whose product quenches NGQD fluorescence via a FRET mechanism. The presence of HCHO inhibits this oxidation, resulting in complementary ratiometric fluorescence and colorimetric signal changes. This method achieved high sensitivity with detection limits of 0.54 μM (fluorescence) and 1.33 μM (colorimetry), excellent selectivity, and was successfully applied for the visual detection of HCHO in real water samples using a smartphone-integrated paper sensor. This work provides a robust and practical solution for rapid on-site monitoring of HCHO in aqueous matrices.

Abstract Image

查看原文本刊更多论文

石墨烯量子点双模态荧光/比色法检测甲醛

虽然气体甲醛（HCHO）的检测方法是完善的，快速和敏感的传感在水性基质仍然是一个挑战。为了解决这一问题，我们开发了一种基于氮掺杂石墨烯量子点/邻苯二胺- ag + (NGQD/OPD-Ag+)系统的双模传感平台，用于水基质中的HCHO分析。在该体系中，Ag+催化OPD的氧化，OPD的产物通过FRET机制猝灭NGQD荧光。HCHO的存在抑制这种氧化，导致互补的比例荧光和比色信号变化。该方法灵敏度高，检出限分别为0.54 μM（荧光）和1.33 μM（比色），具有良好的选择性，成功应用于智能手机集成纸传感器对真实水样中HCHO的视觉检测。这项工作提供了一个强大的和实用的解决方案，快速现场监测HCHO在水性基质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Environmental Functional Materials

自引率

0.00%

发文量