Anomalous gas sensing characteristics of TiO2 nanorod arrays irradiated with high-energy ion beam

Dey S, Mishra SB, Hazra A, Kabiraj D, Roy SC (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Materials Science and Engineering B-Advanced Functional Solid-State Materials Elsevier

Book Volume: 326

Article Number: 119210

DOI: 10.1016/j.mseb.2026.119210

Abstract

Controlled defect engineering using high-energy ion irradiation is an effective technique to tune the physical properties of a material at the nanoscale. Here, we report such effects on vertically oriented TiO2 nanorod arrays grown on conductive glass substrate with different fluences, such as 5 × 1012 and 5 × 1013 ions/cm2, and change in resistance as a function of gas exposure was measured using hydrogen as the probe gas. The samples showed n-type characteristics from pristine to the fluence of 5 × 1012 ions/cm2; while at higher fluence 5 × 1013 ions/cm2, an n-to-p type transition in conductivity is observed. This is attributed to a combined effect of titanium vacancies and oxygen interstitials produced by the energetic ions. Our first-principles calculations show that higher irradiation fluence induces structural distortion that weakens hydrogen adsorption and suppresses charge transfer, collectively explaining the observed switch in gas sensing response and supporting the experimental findings.

Involved external institutions

Binghamton University / State University of New York, Binghamton US United States (USA) (US) Inter-University Accelerator Centre (IUAC) IN India (IN) Indian Institute of Technology Madras IN India (IN) Birla Institute of Technology and Science (BITS) IN India (IN)

How to cite

APA:

Dey, S., Mishra, S.B., Hazra, A., Kabiraj, D., & Roy, S.C. (2026). Anomalous gas sensing characteristics of TiO2 nanorod arrays irradiated with high-energy ion beam. Materials Science and Engineering B-Advanced Functional Solid-State Materials, 326. https://doi.org/10.1016/j.mseb.2026.119210

MLA:

Dey, Sutapa, et al. "Anomalous gas sensing characteristics of TiO2 nanorod arrays irradiated with high-energy ion beam." Materials Science and Engineering B-Advanced Functional Solid-State Materials 326 (2026).

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