Low-trace monitoring of airborne sulphur dioxide employing SnO2-CNT hybrids-based energy-efficient chemiresistor

Vishal Chaudhary; Manjunatha Channegowda; Sajid Ali Ansari; Hari Krishna Rajan; Ajeet Kaushik; Virat Khanna; Zhenhuan Zhao; Hidemitsu Furukawa; Ajit Khosla

Journal of Materials Research and Technology (Sep 2022)

Low-trace monitoring of airborne sulphur dioxide employing SnO2-CNT hybrids-based energy-efficient chemiresistor

Vishal Chaudhary,
Manjunatha Channegowda,
Sajid Ali Ansari,
Hari Krishna Rajan,
Ajeet Kaushik,
Virat Khanna,
Zhenhuan Zhao,
Hidemitsu Furukawa,
Ajit Khosla

Affiliations

Vishal Chaudhary: Research Cell & Department of Physics, Bhagini Nivedita College, University of Delhi, New Delhi 110045, INDIA; Corresponding authors.
Manjunatha Channegowda: Centre for Nanomaterials and Devices, Department of Chemistry, RV College of Engineering, Bengaluru 560059, India; Corresponding authors.
Sajid Ali Ansari: Department of Physics, College of Science, King Faisal University, P.O. Box 400, Hofuf, Al-Ahsa 31982, Saudi Arabia
Hari Krishna Rajan: Research Cell & Department of Physics, Bhagini Nivedita College, University of Delhi, New Delhi 110045, INDIA; Centre for Nanomaterials and Devices, Department of Chemistry, RV College of Engineering, Bengaluru 560059, India; Department of Physics, College of Science, King Faisal University, P.O. Box 400, Hofuf, Al-Ahsa 31982, Saudi Arabia; Department of Chemistry and Center for Bio and Energy Materials Innovation, M. S. Ramaiah Institute of Technology, Bangalore 560054, India; NanoBioTech Laboratory, Health Systems Engineering, Department of Environmental Engineering, Florida Polytechnic University, Lakeland, FL 33805, USA; School of Engineering, University of Petroleum and Energy Studies (UPES), Dehradun, Uttarakhand, India; Department of Mechanical Engineering, MAIT, Maharaja Agrasen University, HP, 174103, India; Department of Applied Chemistry, School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, China; Department of Mechanical System Engineering, Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan
Ajeet Kaushik: NanoBioTech Laboratory, Health Systems Engineering, Department of Environmental Engineering, Florida Polytechnic University, Lakeland, FL 33805, USA
Virat Khanna: Department of Mechanical Engineering, MAIT, Maharaja Agrasen University, HP, 174103, India
Zhenhuan Zhao: Department of Applied Chemistry, School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, China; Corresponding authors.
Hidemitsu Furukawa: Department of Mechanical System Engineering, Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan
Ajit Khosla: Department of Applied Chemistry, School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, China; Corresponding authors.

Journal volume & issue: Vol. 20
pp. 2468 – 2478

Abstract

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Room temperature low-trace detection (lower than 2 ppm) of sulphur dioxide (SO2) through compact, economic and sustainable chemiresistor has created a large demand-supply gap in sensor market. For the first time, this communication reports the room-temperature detection of 1 ppm of airborne SO2 utilizing tin-oxide (SnO2)/carbon nanotube (CNT) hybrids based chemiresistors in variable humidity and temperature environment. The precursor's concentrations were optimized in terms of conductivity to attain utmost sensitivity and lowest detection limit. Amongst all engineered hybrids and pristine precursors, the chemiresistor possessing the highest conductivity (S-2: 0.5 wt% of CNT) exhibited utmost sensitivity (2.3%) towards 1 ppm of SO2 at room temperature under 67% RH. The sensing response is rapid (110 s), repeatable, recoverable (110 s), and steady (for 7 weeks), showing high selectivity against prominent interfering analytes. It is attributed to the formation of p–n type interfacial heterojunctions and faster charge transport pathways in hybrid. Besides, the underlying room temperature SO2 sensing phenomenon is explained in terms of space charge modulation in the depletion region of the p–n hybrid using band theory. These unprecedented outcomes highlight the prospects of engineering intelligent, sustainable and point-of-detection SO2 monitoring strategies based on SnO2/CNT hybrids in terms of cost, time, human resources, energy requirements, and stability.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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