najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2020-11-5-578-589najo-400Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХHigh sensitive room temperature ammonia sensor based on dopant free m-WO3 nanoparticles: Effect of calcination temperatureDuraisamiM. S.

Melaiyur – 609107, Tamilnadu

Tiruchirappalli

tharmamithran@gmail.comParasuramanK.

Melaiyur – 609107, Tamilnadu

Tiruchirappalli

PG & Research Department of Physics, Poompuhar College (Autonomous); Affiliated to Bharathidasan UniversityIndia202029072025115578–589Copyright © Duraisami M.S., Parasuraman K., 20252025Duraisami M.S., Parasuraman K.Duraisami M.S., Parasuraman K.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/400

In this article, monoclinic tungsten tri-oxide (m-WO3) nanoparticles (hereafter NPs) were prepared by facile precipitation method and they were successfully examined as gas sensing materials for monitoring gaseous ammonia at room temperature have been reported. The effect of calcination temperature on structural and morphological properties of the prepared samples were also investigated. Physicochemical properties of the samples were characterized by XRD, SEM, XPS, UV-Vis and PL analysis. XRD studies confirmed the monoclinic structure of the prepared NPs. Optical studies disclosed that the obtained samples were having wider optical band gaps ranging from 2.48 to 2.76 eV. Sensing signatures such as selectivity, transient response along with performance indicators like repeatability and stability have also been investigated. Invitingly, the sample calcined at 823 K exhibited highly improved sensing response of 142 towards 200 ppm of ammonia with rapid response/recovery time of 26 / 79 s.

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The authors declare that there are no conflicts of interest present.