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Non-functionalized Au nanoparticles can act as high-performing humidity sensor

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Abstract

We synthesized gold (Au) nanoparticles via a rapid chemical route by reducing chloroauric acid by trisodium citrate. TEM micrographs revealed that particles were spherical with well-defined lattice structures and most of them were within the size range of 8–12 nm. A single surface plasmon resonance peak observed at 525 nm indicated the uniformness of the spherical morphology of the particles. XRD analysis showed that the particles were well crystalline. An impedance-based humidity sensor device was fabricated for depositing these gold nanoparticles in their non-functionalized state and the sensor revealed fast response time of 54 s, high stability and repeatability, and an impressive average sensitivity of 7.57 MΩ/% RH within the humidity range of 10–95%. SEM micrographs revealed the presence of cracks on the film surface and our analysis of the sensing mechanism correlated the sensitivity and the surface cracks along with smaller particle sizes. Our results show that gold nanoparticles without further functionalization are able to perform as a well-performing humidity sensor.

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Acknowledgements

Navneet Yadav acknowledged Department of Science and Technology (DST), New Delhi (Project No. SR/S2/CMP-0038/2011) for the financial support. Sarita Yadav would like to express her thanks to DST for Inspire Faculty research Grant (DST/INSPIRE/04/2016/001600). The authors are additionally thankful to Prof. K.N. Uttam, Physics Department, University of Allahabad for UV–Visible measurements.

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Authors and Affiliations

  1. Department of Physics, University of Allahabad, Prayagraj, Uttar Pradesh, 211002, India

    Navneet Yadav, Sarita Yadav & Raja Ram Yadav

  2. Department of Applied Physics, Babasaheb Bhimrao Ambedkar University, Lucknow, Uttar Pradesh, 221005, India

    Priyanka Chaudhary & Bal Chandra Yadav

  3. Center for Nanoscience and Technology, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study and Research, V.B.S. Purvanchal University, Jaunpur, Uttar Pradesh, 222003, India

    Kajal Kumar Dey

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  1. Navneet Yadav
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  2. Priyanka Chaudhary
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  3. Kajal Kumar Dey
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  4. Sarita Yadav
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  5. Bal Chandra Yadav
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Correspondence to Kajal Kumar Dey or Sarita Yadav.

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Yadav, N., Chaudhary, P., Dey, K.K. et al. Non-functionalized Au nanoparticles can act as high-performing humidity sensor. J Mater Sci: Mater Electron 31, 17843–17854 (2020). https://doi.org/10.1007/s10854-020-04338-y

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