Cheng Xiao, Yao Yongtao, Zheng Shengliang, Wan Yu, Wei Chenda, Yang Guangcan, Yuan Ye, Tsai Hsu-Sheng, Wang You, Hao Juanyuan
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, P. R. China.
ACS Sens. 2025 Jan 24;10(1):283-291. doi: 10.1021/acssensors.4c02411. Epub 2025 Jan 14.
An effective long-term nitrogen dioxide (NO) monitoring at trace concentration is critical for protecting the ecological environment and public health. Tellurium (Te), as a recently discovered 2D elemental material, is promising for NO detection because of its suitable band structure for gas adsorption and charge mobility. However, the high activity of Te leads to poor stability in ambient and harsh conditions, limiting its application as a gas-sensitive material. Herein, 2D single-elemental Te@Se heterostructures with a core-shell structure are prepared using a solvothermal method. The Te@Se heterostructures demonstrate an extremely high response of 622% to 1 ppm of NO at room temperature, with ultrafast response/recovery times of 10 s/30 s. Moreover, the core-shell heterostructures exhibit excellent stability in NO sensing performance over a period of 90 days. The success relies on the ultrathin Se shell with a thickness of 4-6 nm on Te, which enables the efficient redistribution and transport of interfacial charges. These findings reveal the potential of single-element core-shell heterojunctions to achieve high-performance gas sensing, paving the way for advancements in NO detection materials.
在痕量浓度下进行有效的长期二氧化氮（NO）监测对于保护生态环境和公众健康至关重要。碲（Te）作为一种最近发现的二维元素材料，因其适合气体吸附的能带结构和电荷迁移率而有望用于NO检测。然而，Te的高活性导致其在环境和苛刻条件下稳定性较差，限制了其作为气敏材料的应用。在此，采用溶剂热法制备了具有核壳结构的二维单元素Te@Se异质结构。Te@Se异质结构在室温下对1 ppm的NO表现出622%的极高响应，响应/恢复时间超快，分别为10秒/30秒。此外，核壳异质结构在90天的时间内NO传感性能表现出优异的稳定性。成功的关键在于Te上厚度为4-6 nm的超薄Se壳，它能够实现界面电荷的有效重新分布和传输。这些发现揭示了单元素核壳异质结实现高性能气敏的潜力，为NO检测材料的发展铺平了道路。
