Tunable, Cost‐Effective, and Scalable Structural Colors for Sensing and Consumer Products

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...