Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing

Ramesh, Asha and Gavaskar, D.S. and Nagaraju, P. and Duvvuri, Suryakala and Vanjari, Siva Rama Krishna and Subrahmanyam, Challapalli (2022) Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing. Applied Surface Science Advances, 12 (100349). pp. 1-11. ISSN 2666-5239

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Abstract

Despite being the most favorable ammonia (NH3) gas sensors, metal oxide semiconductors fail to deliver high selectivity and room temperature (RT) sensing. Tuning the metal oxide with doping is an attractive way of overcoming these disadvantages. Herein, we report Mn-doped ZnO microspheres as promising sensors for highly sensitive and selective RT sensing of NH3. ZnO and 2 wt% Mn-doped ZnO microspheres were synthesized by a low-cost and fast solution combustion synthesis, and their structure, morphology, and gas sensing properties were investigated. Mn-doping resulted in a change in the lattice parameters, an increase in the oxygen vacancies, and surface acidity of ZnO as confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Temperature programmed desorption (TPD), respectively. Mn-doped ZnO showed a response (Ra/Rg) of 20.2 in 100 ppm NH3, which is significantly higher than ZnO. The sensor showed high selectivity, three times higher than that of ZnO, and good stability. Improvement in the sensing performance of Mn-doped ZnO is attributed to the increase in the defects and surface acidity with Mn-doping. © 2022 The Author(s)

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IITH Creators:

IITH Creators	ORCiD
Vanjari, Siva Rama Krishna	https://orcid.org/0000-0001-6753-2800
Subrahmanyam, Challapalli	https://orcid.org/0000-0002-2643-3854

Item Type:

Article

Additional Information:

Asha Ramesh wishes to express her gratitude to the Innovation in Science Pursuit for Inspired Research (INSPIRE) initiative of the Department of Science and Technology (DST), Government of India, for granting a Ph.D. research fellowship that allowed her to complete this project in a timely manner.

Uncontrolled Keywords:

Ammonia; Gas sensor; Mn-doped ZnO; Room temperature sensing; Surface acidity; Transition metal doping

Subjects:

Electrical Engineering
Chemistry
Chemistry > Inorganic chemistry

Divisions:

Department of Chemistry
Department of Electrical Engineering

Depositing User:

Ms Palak Jain

Date Deposited:

22 May 2023 09:51

Last Modified:

22 May 2023 09:51