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Facile synthesis of photosensitive iron oxide nanorods and their application as UV photodetectors

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Abstract

Iron oxide nanorods (NRs) possess excellent optoelectronic properties leading to potential UV photodetection and other sensing applications. A wet-chemical synthesis method was carried out to synthesize iron oxide NRs, which were then investigated for their physical and chemical properties. X-ray Diffraction (XRD) confirmed the formation of γ-FeOOH/γ-Fe2O3/α-FeOOH mixed phases of iron oxide. Transmission electron Microscope (TEM) analysis confirmed an average NR length of ∼ 62 ± 23 nm and average diameter of ∼ 10 ± 3 nm. Magnetic Force Microscopic (MFM) studies confirm the magnetic nature of the sample with magnetization degree of ∼ 76 ± 22°. The bandgap of the as-synthesized NRs was estimated to be 2.06 eV by Ultraviolet-visible (UV) spectroscopy. A thin film of the as-synthesized samples was cast on the screen-printed electrodes for measuring the photocurrent in dark and UV illumination at 365 nm wavelength. The NRs exhibited a quick UV photoresponse and recovery times of ∼ 8 ± 3 s at the minimal applied bias of 0.5 V. The synthesis resulted in iron oxide nanorods with impressive response and recovery times. As compared to existing literature reports, this is the first time undoped and multi-phase oxides of iron have been used for UV photodetection application.

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Acknowledgements

The author would like to acknowledge Symbiosis Center for Research and Innovation, Symbiosis International (Deemed University) for their infrastructure and RSF SIU, for their funding support. The authors extend gratitude to the Semiconducting Oxide Materials, Nanostructured and Tailored Heterojunction Lab, Physics Dept. of Physics, IIT Madras, for facilitating UV photosensing measurements.

Funding

Authors acknowledge Symbiosis Centre for Research and Innovations (SCRI) for funding support toward the student. RN is thankful to Symbiosis International (Deemed University) for Research Support Funds (RSF). Authors would further like to acknowledge SAIF/CRNTS, IIT Bombay for providing HRTEM 200 analytical facility.

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Authors and Affiliations

  1. Nanomaterials for Energy Applications Lab, Applied Science Department, Symbiosis Institute of Technology, Pune Campus, Symbiosis International (Deemed University), Pune, Lavale, Pune, Maharashtra, 412115, India

    Vrushali E. Kalokhe, Abha Mahajan & Rupali Nagar

  2. Department of Physics, SRM Institute of Science and Technology, Ramapuram Campus, Chennai, Tamil Nadu, 600089, India

    Sanju Rani

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  1. Vrushali E. Kalokhe
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  2. Abha Mahajan
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  3. Sanju Rani
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  4. Rupali Nagar
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Contributions

All author contributed to the study conception and design. Material preparation was performed by VEK, AM. Data collection, analysis were performed by VEK, SR and RN. The first draft of the manuscript was written by VEK and all authors commented on previous version of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Rupali Nagar.

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Kalokhe, V.E., Mahajan, A., Rani, S. et al. Facile synthesis of photosensitive iron oxide nanorods and their application as UV photodetectors. J Mater Sci: Mater Electron 35, 117 (2024). https://doi.org/10.1007/s10854-023-11874-w

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