Health risks affiliated with the exposure to a wide variety of toxic gases and vapors is a certainty for first responders such as firefighters and HAZMAT team members but also for military personnel in conflict zones, countless other professions from water purification and chemical manufacturing to the oil and gas industry, among others, and even the general public. To address this, we have developed several prototypes for a novel toxic gas sensor platform based on inkjet-printed nematic liquid crystal patterns. These sensors require zero power to operate and are characterized by high sensitivity down to highly relevant ppm and ppb levels, fast response times on the order of seconds, improved durability, and an overall design that is highly customizable by the potential end user. The response times of these sensors exponentially decrease with toxic gas concentration, thereby establishing the toxic gas diffusivity dependence of their mode of action. We demonstrated such prototypes for a range of toxic gases including chlorine, phosgene, hydrogen cyanide, hydrogen sulfide, aliphatic amines, and others, performing interference testing in high humidity and smoke conditions as well as field testing with active firefighters.

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