Highly sensitive and selective detection of benzene, toluene, xylene, and formaldehyde using Au-coated SnO2 nanorod arrays for indoor air quality monitoring

IF 8 1区 化学 Q1 CHEMISTRY, ANALYTICAL
Jihyun Lee , Hyegi Min , Yong-Sahm Choe , Yun Gyu Lee , Kichul Kim , Hyun-Sook Lee , Wooyoung Lee
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Abstract

We report the high performance of Au-coated SnO2 nanorod gas sensors for the detection of hazardous indoor volatile organic compounds (VOCs), such as benzene, toluene, xylene, and formaldehyde (BTXF) gases. Densely ordered SnO2 nanorod arrays were prepared via glancing angle deposition with an electron beam evaporator. The Au layer coating was used as a heterogeneous catalyst to promote the oxidation of VOCs, such as hydrocarbons. After optimizing the Au thickness, the sensor exhibited an excellent sensing response and a rapid response time of < 2.5 s for 10 ppm of BTXF gases. The maximum response was ∼662 for formaldehyde at 400 °C, ∼328 for toluene at 450 °C, ∼170 for xylene at 400 °C, and ∼139 for benzene at 500 °C, which are significantly higher than those of previously reported metal-oxide-semiconductor-based sensors. Each gas was selectively detected by integrating the sensor into a miniaturized gas chromatography (GC) system. The sensors detected ppb-level gas concentrations. Significantly, GC analysis revealed that four types of gases could be separately detected in a mixed gas within 5 min. Our study shows that Au-coated SnO2 nanorod gas sensors integrated with GC can be used as a facile indoor pollutant monitoring system.

采用au包覆SnO2纳米棒阵列对室内空气质量监测中苯、甲苯、二甲苯和甲醛的高灵敏度和选择性检测
我们报道了用于检测有害室内挥发性有机化合物(VOCs),如苯、甲苯、二甲苯和甲醛(BTXF)气体的高性能au涂层SnO2纳米棒气体传感器。在电子束蒸发器上采用掠角沉积法制备了密集有序的SnO2纳米棒阵列。采用金层涂层作为非均相催化剂,促进烃类等挥发性有机化合物的氧化。优化Au厚度后,传感器表现出优异的传感响应和快速的响应时间<10 ppm的BTXF气体2.5 s。400°C时甲醛的最大响应为~ 662,450°C时甲苯的最大响应为~ 328,400°C时二甲苯的最大响应为~ 170,500°C时苯的最大响应为~ 139,这些都明显高于之前报道的基于金属氧化物半导体的传感器。通过将传感器集成到小型气相色谱(GC)系统中,可以选择性地检测每种气体。传感器检测到ppb级的气体浓度。值得注意的是,气相色谱分析表明,在5分钟内,混合气体中可以分别检测到四种类型的气体。我们的研究表明,与气相色谱集成的au涂层SnO2纳米棒气体传感器可以作为一种简便的室内污染物监测系统。
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来源期刊
Sensors and Actuators B: Chemical
Sensors and Actuators B: Chemical 工程技术-电化学
CiteScore
14.60
自引率
11.90%
发文量
1776
审稿时长
3.2 months
期刊介绍: Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.
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