CdS based chemiresistor with Schottky contact: Toxic gases detection with enhanced sensitivity and selectivity at room temperature

Naganaboina, Venkata Ramesh and Singh, Shiv Govind (2022) CdS based chemiresistor with Schottky contact: Toxic gases detection with enhanced sensitivity and selectivity at room temperature. Sensors and Actuators, B: Chemical, 357. pp. 1-14. ISSN 0925-4005

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Abstract

Surmounting the selectivity issue of gas sensors and detecting low ppm concentration of gases is highly significant for widespread deployments of sensors to build networks in applications including vehicular emission, fuel-based household appliances, and industrial emissions. Herein, a strategy is proposed to improve the selectivity and sensitivity of the cadmium sulfide (CdS) based sensor via changes in contact material by utilizing different metals. CdS was deposited via the SILAR method on three different glass substrates which have Au, ITO, and Ag contacts, respectively, through which Schottky barrier height (SBH) was adjusted between CdS and metal contact. CdS was thoroughly verified by structural and morphological characterization techniques. As-fabricated devices were tested, and gas sensing results suggest that Au and ITO contacts have significantly superior selectivity towards NO2 and CO gases over other gases. Further, experimental values reveal that sensors can detect up to 0.3 ppm and 1.25 ppm, respectively. Good selectivity can be attributed to the regulation of the SBH. Additionally, as-fabricated devices displayed good long-term stability and short response and recovery times. The present study may provide a rational design for fabricating a high-performance chemiresistive gas sensor for the detection of sub-ppm levels of hazardous gases present in the environment. © 2022 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Singh, Shiv Govind	http://orcid.org/0000-0001-7319-879X

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 Department of Science and Technology (Fund for Improvement of S&T infrastructure) , Government of India for funding research.

Uncontrolled Keywords:

CdS based sensor; CO and NO2 gases; High selectivity and sensitivity; Schottky and ohmic contact; Sub-ppm gas detection

Subjects:

Electrical Engineering

Divisions:

Department of Electrical Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

13 Jul 2022 10:23

Last Modified:

13 Jul 2022 10:23