期刊
ADVANCED OPTICAL MATERIALS
卷 7, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201900735
关键词
chemical sensing; easy fabrication; Fabry-Perot cavities; solvent detection; structural coloration
资金
- Agency for Science, Technology and Research (A*STAR) through the Singapore International Graduate Award (SINGA) program
- A*STAR SERC Pharos project [1527300025]
- SERC [092154099]
- National Research Foundation [NRF-CRP001-021, NRF-CRP 8-2011-07]
- A*STAR-JCO [1437C00135]
- SUTD Digital Manufacturing and Design Centre [RGDM1830303]
The cost-effective colorimetric detection of chemicals can be a potential substitute for expensive spectrometers. Here, a structural color sensor is presented that can distinguish seven different organic solvents through a timed sharp color change. The color sensor is based on interference effects in a metal-insulator-metal Fabry-Perot (FP) cavity with polydimethylsiloxane (PDMS) serving as the dielectric layer. By tuning the cross-linker to monomer ratio of PDMS and employing a porous nickel (Ni) top layer, the PDMS films experience shrinkage that results in substantial color changes. The time-dependent color change can be used to indicate the type of solvent that the sensor was exposed to. When the sensor is immersed in a solvent, the PDMS diffuses through the porous Ni film at different rates depending on the solvent, resulting in a shrinkage of the PDMS and resonance shift of the FP cavity. Materials used in this single-use sensor are cost effective (approximate to 0.28 USD m(-2)), and the fabrication process requires no lithography and is scalable. Moreover, the FP configuration produces vibrant colors that cover approximate to 50% of the standard Red Green Blue (sRGB) color space and is suited for decorative purposes and consumer products as well.
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