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Keywords = silver decorated hematite

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13 pages, 5157 KB  
Article
Silver Enhances Hematite Nanoparticles Based Ethanol Sensor Response and Selectivity at Room Temperature
by Daniel Garcia-Osorio, Pilar Hidalgo-Falla, Henrique E. M. Peres, Josue M. Gonçalves, Koiti Araki, Sergi Garcia-Segura and Gino Picasso
Sensors 2021, 21(2), 440; https://doi.org/10.3390/s21020440 - 9 Jan 2021
Cited by 20 | Viewed by 4388
Abstract
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 [...] Read more.
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‑Fe2O3)/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−1 range with an excellent linear relationship. In addition, the α-Fe2O3/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. Full article
(This article belongs to the Special Issue Gas Sensing Materials)
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