Single-Phase High-Entropy Oxide Nanoparticles for Wide Dynamic Range Detection of CO2

Naganaboina, Venkata Ramesh and Deshpande, Atul Suresh and Singh, Shiv Govind and et al, . (2022) Single-Phase High-Entropy Oxide Nanoparticles for Wide Dynamic Range Detection of CO2. ACS Applied Nano Materials, 5 (3). pp. 4524-4536. ISSN 2574-0970

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Monitoring wide-range carbon dioxide (CO2) levels with superior sensing performance is extremely important for environmental, human health, safety, and space applications. The reported chemiresistive sensors in the literature have critical drawbacks such as high-temperature operation and long response and recovery times (∼25 min), which remains a challenge for developing CO2sensors. Against these drawbacks, we report Gd0.2La0.2Y0.2Hf0.2Zr0.2O2(Y-HEC)-based sensors obtained by depositing Y-HEC on a glass substrate with different electrodes such as gold (Au), indium tin oxide (ITO), and silver (Ag) for CO2gas detection. The as-fabricated Y-HEC sensor with an ITO electrode displayed a maximum sensing response (46.7%) to 10000 ppm CO2gas at room temperature over other electrodes, which is attributed to the optimized Schottky barrier height between the ITO and Y-HEC. Furthermore, the experimental findings of the sensor with an ITO electrode revealed superior sensing characteristics such as wide-range CO2gas detection (250-10000 ppm), faster response and recovery times (49-200 s), high repeatability, strong selectivity to CO2over other gases, good long-term stability, and room temperature operation. Improvements in the CO2-sensing performance are attributed to nonagglomerated nanoparticles leading to the porous structure and high surface area, and intrinsic oxygen vacancies. We present an easy strategy to synthesize sensing materials and improve the desirable sensing performance for the development of practical applications of CO2sensors. © 2022 American Chemical Society. All rights reserved.

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IITH Creators:
IITH CreatorsORCiD
Deshpande, Atul Suresh
Singh, Shiv Govind
Item Type: Article
Additional Information: This work was supported by the project “M2Smart: Smart Cities for Emerging Countries Based on Sensing, Network and Big Data Analysis of Multimodal Regional Transport System”, JST/JICA SATREPS, Japan. The authors acknowledge the funding provided by the Department of Science and Technology (Fund for Improvement of S&T Infrastructure), Government of India, for this research. The authors are grateful for the financial assistance and characterization facilities provided by the Indian Institute of Technology, Hyderabad. We are very grateful to Tanmoya Nemai Ghosh for her assistance in the laboratory work.
Uncontrolled Keywords: chemiresistive CO2gas sensor; high-entropy oxide; ohmic and Schottky contacts; room temperature operation; Schottky barrier height control; selective and sensitive detection
Subjects: Others > Metallurgy Metallurgical Engineering
Electrical Engineering
Materials Engineering > Materials engineering
Divisions: Department of Electrical Engineering
Department of Material Science Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 22 Jul 2022 09:10
Last Modified: 22 Jul 2022 09:10
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