Fabrication of piezoresistive Si nanorod-based pressure sensor arrays: a promising candidate for portable breath monitoring devices

Ghosh, R. et al. (2021) Fabrication of piezoresistive Si nanorod-based pressure sensor arrays: a promising candidate for portable breath monitoring devices. Nano Energy, 80, 105537. (doi: 10.1016/j.nanoen.2020.105537)

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This paper reports on the controlled fabrication of a highly sensitive piezoresistive sensor by using Si nanorod (NR) arrays. An efficient, large-area, scalable strategy was adopted to fabricate the pressure sensors by incorporating chemically etched, high-aspect-ratio, vertical Si NR arrays between two thin Au layers. The piezoresistive properties corresponding to dimension- and position-controlled and randomly etched, closely packed, and thin Si NR arrays were exploited to fabricate the small, portable, and device-compatible pressure sensors. The Si-NR-based piezoresistive sensors exhibited a high sensitivity of 0.49 MPa−1, thereby demonstrating its superiority over other unconventional piezoresistive nanomaterials such as Si with different configurations of nanostructures. Furthermore, the sensors exhibited a large variation (~45%) in the current at a constant bias voltage of 2 V under a weak applied pressure corresponding to an inert gas flow of 5 sccm. The excellent pressure sensing performance of the piezoresistive Si NRs enabled the efficient detection of changes corresponding to the human breathing pattern. In particular, the key advantages of such pressure sensors is the simple, inexpensive, and scalable fabrication process; high sensitivity with ultra-low-pressure detection; and excellent ambient stability (>several months) with a high durability pertaining to more than 1,000 cycles of pressure loading/unloading. Furthermore, we demonstrated the ability of the pressure sensor to act as a portable human breath sensor to monitor respiratory parameters in a noninvasive and personalized manner. The results can provide direction for the realization of next-generation breath-sensing gadgets and other leading-edge applications in the domain of electronic and healthcare devices.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Ghosh, Dr Ramesh
Creator Roles:
Ghosh, R.Writing – original draft, Conceptualization, Methodology, Investigation, Data curation, Formal analysis
Authors: Ghosh, R., Song, M. S., Park, J., Tchoe, Y., Guha, P., Lee, W., Lim, Y., Kim, B., Kim, S.-W., Kim, M., and Yi, G.-C.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Nano Energy
ISSN (Online):2211-3282
Published Online:27 October 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Nano Energy 80: 105537
Publisher Policy:Reproduced under a Creative Commons License

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