Highly sensitive, responsive, and selective iodine gas sensor fabricated using AgI-functionalized graphene

• DOI: 10.1038/s41467-025-56621-3
• Publication Date: 2025-01-30T10:48:57Z
• Authors: Zhuo Chen; Qiong Lei; Yinchang Ma; Jinrong Wang; Yuan Yan; Jun Yin; Jiaqiang Li; Jie Shen; Guanxing Li; Tingting Pan; Xinglong Dong; Bambar Davaasuren; Yaping Zhang; Jefferson Zhe Liu; Jun Tao; Yu Han
• Keywords: Science; Q; Article

Radioactive molecular iodine (I2) is a critical volatile pollutant generated in nuclear energy applications, necessitating sensors that rapidly and selectively detect low concentrations of I2 vapor to protect human health the environment. In this study, we design prepare three-component sensing material comprising reduced graphene oxide (rGO) as substrate, silver iodide (AgI) particles active sites, polystyrene sulfonate an additive. The AgI enable reversible adsorption conversion molecules into polyiodides, inducing substantial charge density variation rGO. This mechanism facilitates exceptional sensitivity selectivity, ultrafast response recovery times, room-temperature operation. A multifunctional sensor prototype fabricated utilizing achieves fastest reported response/recovery times (22/22 seconds dynamic mode 4.2/11 static mode) detection limit 25 ppb, surpassing standards set by Occupational Safety Health Administration (OSHA) National Institute for (NIOSH), while outperforming commercial gas sensors. work provides profound insights materials mechanisms real-world applications. study presents using AgI-functionalized graphene, which exhibits fast with ultralow limit, safety counterparts