Fig. 4. (a) Schematic of a Co-functionalized TiO2 nanotube (Co-TNT) based sensing platform for the detection of SARS-CoV-2. Reproduced from ref. 90 with permission from Multidisciplinary Digital Publishing Institute (MDPI), copyright 2020, (b) corona vaccine, and (c) an illustration diagrammatically illustrating the dip-coating technique for tempered glass units with PVA-based Cu–Gr nanocomposite substrates and the mechanism of action for tempered glass surfaces coated with Cu–Gr. Reproduced from ref. 93 with permission from the American Chemical Society, copyright 2020.
