Laboratory of Physical Chemistry Research, Faculty of Sciences, National University of Engineering, Av. Tupac Amaru 210, 15333 Lima, Peru.
Laboratory of Nanotechnology, Faculty of Gama, Area Especial de Indústria Projeção A, UNB-DF-480, University of Brasilia, Gama Leste, 72444-240 Brasilia, Brazil.
Sensors (Basel). 2021 Jan 9;21(2):440. doi: 10.3390/s21020440.
Gas sensors are fundamental for continuous online monitoring of volatile organic compounds. Gas sensors based on semiconductor materials have demonstrated to be highly competitive, but are generally made of expensive materials and operate at high temperatures, which are drawbacks of these technologies. Herein is described a novel ethanol sensor for room temperature (25 °C) measurements based on hematite (α‑FeO)/silver nanoparticles. The AgNPs were shown to increase the oxide semiconductor charge carrier density, but especially to enhance the ethanol adsorption rate boosting the selectivity and sensitivity, thus allowing quantification of ethanol vapor in 2-35 mg L range with an excellent linear relationship. In addition, the α-FeO/Ag 3.0 wt% nanocomposite is cheap, and easy to make and process, imparting high perspectives for real applications in breath analyzers and/or sensors in food and beverage industries. This work contributes to the advance of gas sensing at ambient temperature as a competitive alternative for quantification of conventional volatile organic compounds.
气体传感器是对挥发性有机化合物进行连续在线监测的基础。基于半导体材料的气体传感器具有很强的竞争力，但通常由昂贵的材料制成，并在高温下运行，这是这些技术的缺点。本文描述了一种基于赤铁矿(α-FeO)/银纳米粒子的新型室温(25°C)乙醇传感器。AgNPs 被证明可以增加氧化物半导体的电荷载流子密度，但特别可以提高乙醇的吸附速率，从而提高选择性和灵敏度，因此可以在 2-35 mg/L 的范围内定量检测乙醇蒸气，并且具有极好的线性关系。此外，α-FeO/Ag 3.0wt%纳米复合材料价格低廉，易于制造和加工，为在呼吸分析仪和/或食品饮料行业中的传感器中的实际应用提供了广阔的前景。这项工作推动了室温下的气体传感技术的发展，作为对常规挥发性有机化合物进行定量分析的一种有竞争力的替代方法。
