Sensor that is real-time and continuous, for humidity, organic vapors, pressure, mechanical force, light, temperature or specific chemical species.
Manufacturing methods to generate structural color (i.e. physical structures) are generally tedious and costly, resulting in limited commercial use. In addition, available films are rigid, lack organic based materials, and may be subject to environmental degradation. The commercial electronic-based humidity sensors are expensive and require power. The commercial paper-based humidity sensors use cobalt chloride, which are cheap and do not require power, but have several major issues: toxicity (cobalt chloride is toxic); non-real-time sensing; limited reliability and shelf life.
This invention uses a layering technique which exhibits structural color, specifically, the light response of a structure involving a versatile polymer layer backed by a thin versatile metal layer on a substrate.
US Patent Pending, US20220003684A1