Volume 9, Issue 4 2401214
Research Article

Fe-Mediated Tweaking of Band Bending and Activation Energy in α-MoO3 Nano Lamella for Enhanced NO2 Gas Detection Under Low Operating Temperature

R. Aysha Parveen

R. Aysha Parveen

Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, Tamil Nadu, 603203 India

Centre of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203 India

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E. Vinoth

E. Vinoth

Centre of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203 India

Nanotechnology Research Centre, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203 India

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K. Hara

K. Hara

Research Institute of Electronics, Shizuoka University, 3–5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka, 432-8011 Japan

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J. Archana

J. Archana

Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, Tamil Nadu, 603203 India

Centre of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203 India

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S. Ponnusamy

Corresponding Author

S. Ponnusamy

Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, Tamil Nadu, 603203 India

Centre of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203 India

E-mail: [email protected]; [email protected]

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M. Navaneethan

Corresponding Author

M. Navaneethan

Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, Tamil Nadu, 603203 India

Centre of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203 India

Nanotechnology Research Centre, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203 India

E-mail: [email protected]; [email protected]

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First published: 23 September 2024
Citations: 4

Abstract

Concern over increasing pollution and ways to mitigate it is in high demand due to the swift advancement of technology and the creation of advanced utilities. Nitrogen oxide (NO2) is a well-known evolved toxin that poses a threat to human health, the environment, and biodiversity. Therefore, several works are carried to sense the NO2 gas at its trace concentration. However, the majority of NO2 sensors that have been reported have inadequate Limit of Detection (LOD), high operating temperature, and low sensitivity. Orthorhombic molybdenum oxide (α-MoO3) recently emerged as hotspot in the gas sensing research and noted for its high sensitivity, and distinct sensing capabilities owing to its unique layered structure. In this study, Fe-doped α-MoO3 nanosheets for NO2 sensing is prepared, and at a low operating temperature of 110 °C, an excellent sensitivity of 1282% for 10 ppm of NO2 is achieved. Long-term stability, good repeatability, and an ultra-low detection limit of 79 ppt are also demonstrated by the manufactured sensors. In addition, the obtained low activation energy of -2.9 KJ mol−1 and the high band bending for FM6 supports the highly responsive NO2 detection at low operating temperatures.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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