Can QR Codes be used to readout Colorimetric Gas Sensors? A Back-Compatible Color QR Code with an Embedded CO2 Sensor Dye. - Ismael Benito-Altamirano; Laura Engel; Ferran Crugeira; Miriam Marchena; Cristian Fàbrega; Jürgen Wöllenstein; Joan Daniel Prades (IEEE SENSORS, 2024)