Figure 3.

(a) 5-(N-carbazole styryl)-1,3-dimethyl-barbituricacid (CB)- polystyrene (PS)/ G-NH₂ sensor fabrication in detecting picric acid. Reprinted from work in [3] with permission from Elsevier. (b) Mechanistic view of forming gel-P using synthesized polymer P grafted onto the gelatin. Adapted from work in [89] with permission from Elsevier. (c) Simple representation demonstrating the receptor grafting process takes place on the copolymeric Polystyrene-co-maleic anhydride (PSMA) nanofiber giving rise to the development of optical sensory fibers. Adapted from work in [90] with permission from American Chemical Society.