Zero‐Power, Optical Toxic Gas and Vapor Sensors Utilizing Printed Nematic Liquid Crystal Patterns on Selectively Reactive Substrates by Ryan A. Williams, Grace A. R. Rohaley, Ashwathanarayana Gowda, Gisele Pegorin, Andrea Oprandi, Denis Motovilov, Anthony Schneider, Elda Hegmann, Marianne E. Prévôt, Torsten Hegmann

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