用于室温下低至ppb浓度NO2检测的Au修饰SnTe异质结气体传感器
An Au-modified SnTe heterojunction gas sensor for the ppb-level detection of NO2 at room temperature
张昊晨 1黄宝玉 1黄舒文1
作者信息
- 1. 大连理工大学集成电路学院，大连 116000
- 折叠
摘要
针对室温下微量二氧化氮（NO2）检测的需求，本文通过水热法制备了p型SnTe纳米材料，并采用原位还原法在其表面负载不同量的Au纳米颗粒，构建了Au-SnTe异质结气体传感器。XRD、XPS、SEM、TEM及HRTEM等表征结果表明，Au纳米颗粒（尺寸约数纳米）均匀分散于SnTe层状表面，两者形成清晰异质结界面，且Au修饰显著提高了材料表面吸附氧负离子的比例。室温（20 ℃）气敏测试显示，Au修饰有效提升了SnTe对NO2的响应性能：0.7?%Au-SnTe对1?ppm NO2的响应值达5.489，较纯SnTe（3.467）提升36.8%，响应时间缩短13.5%，并可检测低至0.075?ppm（75?ppb）的NO2。机理分析表明，归因于Au的溢出效应，Au纳米粒子催化解离空气中氧分子，生成活性氧物种并迁移至SnTe表面，为NO2吸附反应提供更多活性位点。该Au-SnTe异质结传感器在室温下表现出高灵敏度、良好重复性和快速响应能力，为室温下、低浓度的NO2监测提供了一种可行的传感材料方案。
Abstract
To meet the demand for trace nitrogen dioxide (NO2) detection at room temperature, p-type SnTe nanomaterials were synthesized via a hydrothermal method, and different amounts of Au nanoparticles were loaded on their surface by an in-situ reduction route to construct Au-SnTe heterojunction gas sensors. Characterization results including XRD, XPS, SEM, TEM and HRTEM show that Au nanoparticles (several nanometers in size) are uniformly dispersed on the layered SnTe surface, forming a clear heterojunction interface, and Au modification significantly increases the proportion of surface-adsorbed oxygen anions. Room-temperature (20?℃) gas sensing tests reveal that Au decoration effectively enhances the NO2 sensing performance of SnTe: the response of 0.7?%Au-SnTe to 1?ppm NO2 reaches 5.489, which is 36.8% higher than that of pristine SnTe (3.467), while the response time is shortened by 13.5%, and NO2 concentrations as low as 0.075?ppm (75?ppb) can be detected. Mechanism analysis indicates that, attributed to the spillover effect of Au, Au nanoparticles catalytically dissociate oxygen molecules in air, generating reactive oxygen species that migrate onto the SnTe surface, providing more active sites for NO2 adsorption and reaction. This Au-SnTe heterojunction sensor exhibits high sensitivity, good repeatability and fast response at room temperature, offering a feasible sensing material solution for room-temperature, low-concentration NO2detection.关键词
集成纳电子科学/SnTe/贵金属修饰/异质结/二氧化氮/Key words
Integrated nanoelectronic science/SnTe/Noble metal modification/Heterojunction/Nitrogen dioxide引用本文复制引用
张昊晨,黄宝玉,黄舒文.用于室温下低至ppb浓度NO2检测的Au修饰SnTe异质结气体传感器[EB/OL].(2026-04-13)[2026-04-21].http://www.paper.edu.cn/releasepaper/content/202604-99.学科分类
化学
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