Abstract
The need to sense and track in real time through sustainable and multifunctional labels is exacerbated by the COVID‐19 pandemic, where the simultaneous measurement of body temperature and the fast tracking of people is required. One of the big challenges is to develop effective low‐cost systems that can promote healthcare provision everywhere and for that, smarter and personalized Internet of things (IoT) devices are a pathway in large exploration, toward cost reduction and sustainability. Using the concept of color‐multiplexed quick response (QR) codes, customized smart labels formed by two independent layers and smart location patterns provide simultaneous tracking and multiple synchronous temperature reading with maximum sensitivity values of 8.5% K−1 in the physiological temperature range, overwhelming the state‐of‐the‐art optical sensor for healthcare services provided electronically via the internet (eHealth) and mobile sensors (mHealth).
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