Chen Zhuo, Lei Qiong, Ma Yinchang, Wang Jinrong, Yan Yuan, Yin Jun, Li Jiaqiang, Shen Jie, Li Guanxing, Pan Tingting, Dong Xinglong, Davaasuren Bambar, Zhang Yaping, Liu Jefferson Zhe, Tao Jun, Han Yu
Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.
Hebei Onlysense Technology Co. Ltd, Tangshan, China.
Nat Commun. 2025 Jan 30;16(1):1169. doi: 10.1038/s41467-025-56621-3.
Radioactive molecular iodine (I) is a critical volatile pollutant generated in nuclear energy applications, necessitating sensors that rapidly and selectively detect low concentrations of I vapor to protect human health and the environment. In this study, we design and prepare a three-component sensing material comprising reduced graphene oxide (rGO) as the substrate, silver iodide (AgI) particles as active sites, and polystyrene sulfonate as an additive. The AgI particles enable reversible adsorption and conversion of I molecules into polyiodides, inducing substantial charge density variation in rGO. This mechanism facilitates exceptional sensitivity and selectivity, ultrafast response and recovery times, and room-temperature operation. A multifunctional sensor prototype fabricated utilizing this material achieves the fastest reported response/recovery times (22/22 seconds in dynamic mode and 4.2/11 seconds in static mode) and a detection limit of 25 ppb, surpassing standards set by the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH), while outperforming commercial I gas sensors. This work provides profound insights into the design of I sensing materials and mechanisms for real-world applications.
放射性分子碘（I）是核能应用中产生的一种关键挥发性污染物，因此需要能够快速、选择性地检测低浓度碘蒸气的传感器，以保护人类健康和环境。在本研究中，我们设计并制备了一种由还原氧化石墨烯（rGO）作为基底、碘化银（AgI）颗粒作为活性位点以及聚苯乙烯磺酸盐作为添加剂组成的三组分传感材料。AgI颗粒能够使碘分子可逆吸附并转化为多碘化物，从而在rGO中引起显著的电荷密度变化。这一机制促进了卓越的灵敏度和选择性、超快的响应和恢复时间以及室温操作。利用这种材料制造的多功能传感器原型实现了已报道的最快响应/恢复时间（动态模式下为22/22秒，静态模式下为4.2/11秒）以及25 ppb的检测限，超过了美国职业安全与健康管理局（OSHA）和美国国家职业安全与健康研究所（NIOSH）设定的标准，同时性能优于商用碘气体传感器。这项工作为实际应用中的碘传感材料设计和机制提供了深刻见解。
