Composite Chitosan-TiO2 Nanocrystal Optical Metasurfaces for Humidity Sensing in the Visible Spectrum
Source abstract
Abstract
We report the fabrication and characterization of responsive dielectric metasurfaces composed of titanium dioxide (TiO 2 ) nanocrystals (NCs) and chitosan hydrogel biopolymer composites. Chitosan is controllably introduced into aqueous TiO 2 NC dispersions to formulate adaptive inks. The inks are then used in a nanoimprinting process to produce moisture-responsive metasurfaces with high quality factor ( Q ), quasi-guided mode (QGM) resonances. The metasurfaces function as environmental relative humidity (RH) sensors, exhibiting a 250% enhancement in sensitivity with the addition of chitosan─to a maximum of 0.29 nm/%RH. This work presents a scalable, single-step, room-temperature strategy for producing optically tunable metasurfaces in the visible, offering high sensitivity and quality factor resonances, and enabling enhanced optical humidity sensor performance.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Polydiacetylene-based materials and applications · Transition Metal Oxide Nanomaterials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Electrical and Systems Engineering
University of Pennsylvania
Department of Materials Science and Engineering
Department of Chemistry
Funding
Division of Engineering Education and Centers
References (75)
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