Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 49, Pages 55231-55242Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c15195
Keywords
metal-insulator-metal (MIM); stimuli-responsive polymer; color filter; temperature responsiveness; alcohol responsiveness; local detection
Funding
- National Research Foundation (NRF) of Korea [2018R1D1A1B07044345, 2019R1A2C2088615]
- Korea Institute of Energy Technology Evaluation and Planning [20184030202220]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20184030202220] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019R1A2C2088615, 2018R1D1A1B07044345] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Planar metal-insulator-metal (MIM) optical cavities are attractive for biochemical and environmental sensing applications, as they offer a cost-effective cavity platform with acceptable performances. However, localized detection and scope of expansion of applicable analytes are still challenging. Here, we report a stimuliresponsive color display board that can exhibit local spectral footprints, for locally applied heat and alcohol presence. A thermoresponsive, optically applicable, and patternable copolymer, poly(N-isopropylacrylamide-r-glycidyl methacrylate), is synthesized and used with a photosensitive cross-linker to produce a responsive insulating layer. This layer is then sandwiched between two nanoporous silver membranes to yield a thermoresponsive MIM cavity. The resonant spectral peak is blue-shifted as the environmental temperature increases, and the dynamic range of the resonant peak is largely affected by the composition and structure of the cross-linker and the copolymer. The localized temperature increase of silk particles with gold nanoparticles by laser heating can be measured by reading the spectral shift. In addition, a free-standing color board can be transferred onto a curved biological tissue sample, allowing us to simultaneously read the temperature of the tissue sample and the concentration of ethanol. The stimuli-responsive MIM provides a new way to optically sense localized environmental temperature and ethanol concentration fluctuations.
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