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Al:ZnO nanosheets on flexible stainless steel substrate as impact sensor

Gaddam, V and Neella, N and Nayak, MM and Rajanna, K (2018) Al:ZnO nanosheets on flexible stainless steel substrate as impact sensor. In: 2nd International Conference on Large Area Flexible Microelectronics, ILAFM 2016, 20 - 22 December 2016, Bengaluru, pp. 10779-10786.

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Official URL: https://doi.org/10.1016/j.matpr.2017.12.362


We report the fabrication of impact sensor on flexible stainless steel substrate (SS 304) based on Al:ZnO nanosheets and Polydimethylsiloxane (PDMS) nanocomposite film. Synthesis of Al:ZnO nanosheets are carried out by hydrothermal method at lower temperature (90 °C) on Al alloy substrate without Al dopants. PDMS polymer is prepared by mixing of curing agent and base (Silicone Elastomer, Sylgard 184) in the ratio of 10:1 respectively. For the fabrication of impact sensor, a mixer of PDMS (1 gm) and Al:ZnO nanosheets (0.1 gm) are used for making the nanocomposte film. The mixture of nanocomposite solution was spin coated (500 RPM with 60 Sec) over the flexible stainless steel (diameter of 25 mm) substrate, subsequently kept the film at 85 °C for 2 hrs. The cured nanocomposite film is sandwich between Au coated substrates along with the necessary electrical leads. The maximum output response obtained from the fabricated Al:ZnO nanosheets and PDMS nanocomposite film based impact sensor is about 4.45 V with fast finger impacts. Various finger impacts (slow, medium and fast, force in the range of 50 to 120 gms) showed the maximum output responses of 2.01, 3.19 and 4.45 V respectively. The variations in the magnitude (speed) of finger impacts suggest the possible use of developed sensor for impact as well as speed sensing applications. In addition, the overall output response of the nanocomposite sensor can be used for energy harvesting applications as a power source in ultra low power devices. It can also be used in flexible and stretchable device applications include touch sensor, e-skin, personal healthcare and biomedical applications.

Item Type: Conference Paper
Publication: Materials Today: Proceedings
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to the Elsevier Ltd.
Keywords: Flexible substrates; Hydrothermal synthesis; Impact sensor; Piezoelectricity; ZnO nanosheets
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 19 Aug 2022 05:51
Last Modified: 19 Aug 2022 05:51
URI: https://eprints.iisc.ac.in/id/eprint/76006

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