Self-powered humidity sensor using chitosan-based plasmonic metal-hydrogel-metal filters

Jaehyuck Jang; Kyungnam Kang; Niloufar Raeis-Hosseini; Aizhan Ismukhanova; Inkyu Park; Junsuk Rho

doi:10.1117/12.2567088

20 August 2020 Self-powered humidity sensor using chitosan-based plasmonic metal-hydrogel-metal filters

Jaehyuck Jang, Kyungnam Kang, Niloufar Raeis-Hosseini, Aizhan Ismukhanova, Inkyu Park, Junsuk Rho

Proceedings Volume 11461, Active Photonic Platforms XII; 114612J (2020) https://doi.org/10.1117/12.2567088
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Conference Poster

Abstract

We introduced tunable Fabry-Pérot resonator using metal-insulator-metal multilayer, in which the insulator is hydrogel foam of chitosan [1]. The chitosan, one of polysaccharide, is responsive to external humidity, so the thickness and refractive index of chitosan change in response to relative humidity (RH); this trait can be utilized to tune resonance wavelegths of the resonator. This tunable color filter can function as humidity sensor when incorporated with photovoltaic (PV) cell. The PV cell transmit input optical spectrum to output current, which enables to determine the relationship between RH h and Response S defined the change in current before and after injection of humidity: S = -0.00002*h^2+0.0046*h-0.0238. Therefore, the response may correctly indicate RH of ambient in real-time. The proposed sensor would be simple to fabricate and potentially have zero-power consumption due to combination with PV cell, which makes the sensor useful for monitoring RH in enclosed spaces, workplaces and storage areas.

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Jaehyuck Jang, Kyungnam Kang, Niloufar Raeis-Hosseini, Aizhan Ismukhanova, Inkyu Park, and Junsuk Rho "Self-powered humidity sensor using chitosan-based plasmonic metal-hydrogel-metal filters", Proc. SPIE 11461, Active Photonic Platforms XII, 114612J (20 August 2020); https://doi.org/10.1117/12.2567088

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