@misc{10481/78118,
year = {2022},
month = {11},
url = {https://hdl.handle.net/10481/78118},
abstract = {QRsens represents a family of Quick Response (QR) sensing codes for in-situ air analysis with a customized
smartphone application to simultaneously read the QR code and the colorimetric sensors. Five colorimetric
sensors (temperature, relative humidity (RH), and three gas sensors (CO2, NH3 and H2S)) were designed with the
aim of proposing two end-use applications for ambient analysis, i.e., enclosed spaces monitoring, and smart
packaging. Both QR code and colorimetric sensing inks were deposited by standard screen printing on white
paper. To ensure minimal ambient light dependence of QRsens during the real-time analysis, the smartphone
application was programmed for an effective colour correction procedure based on black and white references for
three standard illumination temperatures (3000, 4000 and 5000 K). Depending on the type of sensor being
analysed, this integration achieved a reduction of ~71 – 87% of QRsens’s dependence on the light temperature.
After the illumination colour correction, colorimetric gas sensors exhibited a detection range of 0.7–4.1%,
0.7–7.5 ppm, and 0.13–0.7 ppm for CO2, NH3 and H2S, respectively. In summary, the study presents an
affordable built-in multi-sensing platform in the form of QRsens for in-situ monitoring with potential in different
types of ambient air analysis applications.},
organization = {Spanish MCIN/AEI/10.13039/
501100011033/ (Projects PID2019–103938RB-I00, ECQ2018–004937-
P and grant IJC2020–043307-I)},
organization = {Junta de Andalucía (Projects B-
FQM-243-UGR18, P18-RT-2961)},
organization = {European Regional Development Funds (ERDF)},
organization = {European Union NextGenerationEU/PRTR},
publisher = {Elsevier},
keywords = {QR codes},
keywords = {Colorimetric sensors},
keywords = {Colour correction},
keywords = {Smartphone},
keywords = {QR analytical devices},
title = {QRsens: Dual-purpose quick response code with built-in colorimetric sensors},
doi = {10.1016/j.snb.2022.133001},
author = {Escobedo Araque, Pablo and Ramos Lorente, Celia Esperanza and Ejaz, Ammara and Erenas Rodríguez, Miguel María and Martínez Olmos, Antonio and Carvajal Rodríguez, Miguel Ángel and García-Núñez, Carlos and Orbe Payá, Ignacio De and Capitán Vallvey, Luis Fermín and Palma López, Alberto José},
}