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Ultraviolet Sensing Using TiO2 Nanotube Integrated High Resolution Planar Microwave Resonator Device

Abstract

This paper presents a unique integrated UV light sensing concept and introduces a device with a detection limit of 1.96 nW/cm2. The combination of a high quality factor, microwave planar resonator (Q ~ 50,000) with a semiconducting nanomaterial, enables a revolutionary potential paradigm for photodetection of low light intensities and small form factors. The presenting device employs a high-resolution microwave microstrip resonator as the signal transducer to convert the variant dielectric properties (permittivity and conductivity) of the nanotube membrane to the electrical signals such as resonant frequency, quality factor and resonant amplitude. The microwave resonator has an active feedback loop to improve the initial quality factor of the resonator from 200 to 50,000 and leads to the sensing resolution boost by orders of magnitude. Anatase TiO2 nanotubes are assembled on the surface of the microwave resonator. At the exposure to UV light, electron-hole pair generation and recombination on the nanotubes’ structure are exploited as the unique signature to quantify the UV light intensity. The change of dielectric properties in the nanotube membrane is monitored by the under lying active microwave resonator. The proposed concept enables detection and monitoring of UV light in high resolution, with very small exposure power in the integrated form factors.

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Publication details

The article was received on 14 Sep 2017, accepted on 24 Jan 2018 and first published on 25 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR06869G
Citation: Nanoscale, 2018, Accepted Manuscript
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    Ultraviolet Sensing Using TiO2 Nanotube Integrated High Resolution Planar Microwave Resonator Device

    M. H. Zarifi, B. D. Wiltshire, N. Mahdi, P. Kar, K. Shankar and M. Daneshmand, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR06869G

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