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Highly selective NOx chemiresistive sensor based on n-type tungsten oxide nanorods

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Abstract

In this article, tungsten trioxide (WO3) nanorods were successfully synthesized by a hydrothermal method and used for the detection of NOx. X-ray diffraction analysis revealed the hexagonal phase of WO3. Field emission scanning electron microscopy and transmission electron microscopy showed WO3 nanorods with an average diameter of 200 nm. X-ray photoelectron spectroscopy analysis showed that the oxidation state of tungsten in WO3 was +6. The WO3 sensor exhibited high sensitivity for the detection of NOx (50 ppm) at 250°C. The sensor showed good linearity from 10 to 50 ppm of NOx, with a sensing response of 8–84%. Even under a high humidity (83%) environment, the sensor detected 50 ppm of NOx. The sensor exhibited good selectivity towards NOx compared to other oxidizing and reducing gases. The sensor also showed excellent stability even after 4 weeks.

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Acknowledgements

The Department of Science and Technology–Science and Engineering Research Board (DST-SERB), New Delhi 110070, Government of India, has funded this research (sanction order no. EMR/2017/000300). Further, we acknowledge the University Grants Commission (UGC)–IUAC (IUAC/XIII.7/UFR-64312), UGC-SAP (F.5-14/2016/DRS-1) and DST-FIST for supplying equipment and experimentation facilities to the Department of Nanoscience and Technology at Bharathiar University in Coimbatore 641046, Tamil Nadu, India.

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Authors and Affiliations

  1. Advanced Materials and Devices Laboratory, Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641046, India

    Mathankumar Manoharan, Kamaraj Govindharaj, K Muthumalai, Sabarish Kumaravel, Yuvaraj Haldorai & Ramasamy Thangavelu Rajendra Kumar

  2. Defence Metallurgical Research Laboratory (DMRL), Defence Research and Development Organisation (DRDO), Hyderabad, 500058, India

    P Saravanan

  3. School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Republic of Korea

    Yuvaraj Haldorai

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  1. Mathankumar Manoharan
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  2. Kamaraj Govindharaj
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  3. K Muthumalai
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  4. Sabarish Kumaravel
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  5. P Saravanan
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  6. Yuvaraj Haldorai
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  7. Ramasamy Thangavelu Rajendra Kumar
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Correspondence to Ramasamy Thangavelu Rajendra Kumar.

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Manoharan, M., Govindharaj, K., Muthumalai, K. et al. Highly selective NOx chemiresistive sensor based on n-type tungsten oxide nanorods. Bull Mater Sci 46, 225 (2023). https://doi.org/10.1007/s12034-023-03066-3

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  • DOI: https://doi.org/10.1007/s12034-023-03066-3

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