![]() ![]() Interestingly, PDA-embedded electrospun nanofibers have been exploited as a colorimetric substrate for detecting different VOCs because the interaction between the polymer backbone and the molecules of VOC induces a stress, resulting in a color alteration Consequently, the obtained electrospun nanofiber mat contains polymeric fibers embedded with PDAs. The polymerization of the prepared mat is generally preceded by UV irradiation, leading to self-assembly of the DA monomer. Thus, blending a diacetylene (DA) monomer with a supportive polymer is suggested to overcome the limitation of the electrospinning process as shown Fig. Even though electrospun PDA mats suggest a sensitive colorimetric substrate toward various analytes, their preparation is quite challenging. Among them, polydiacetylenes (PDAs) are of great interest in colorimetric sensing as they show a vivid color change from blue to red when stimulated by heat, mechanical stress, ligand-receptor interaction, etc. These features mainly ensue from delocalized тг-systems in the polymeric backbone. Conjugated PolymersĬonjugated polymers due to their attractive properties (such as optical and electrical) have been recently implemented in sensing platforms. The following section discusses different scenarios employed in the fabrication of colorimetric sensor-based nanofibers and their advantages and drawbacks. The most important objective of the designed sensors based on colorimetric nanofibers is to obtain an accurate and fast response that the naked eye can observe. The color-change performance of nanofibers may arise from an embedded dye or its derivation, the use of conjugated polymer, or surface functionalization. Color changes mainly result from the interaction between the analyte and the induced functionality on the surface of electrospun nanofibers. As expected, they have shown a rapid response in capturing the analytes and therefore amplifying the sensitivity and performance Due to the outstanding characteristics of electrospun nanofibers, they have been widely employed to advance this novel colorimetric sensing technology. Given the advantages of colorimetric sensing, researchers have focused extensively on the improvement of colorimetric gas sensing to provide user-friendly detection devices that can warn people about the presence of dangerous analytes in the monitored environment. As such, these features can offer serviceability as an appropriate sensor in end-user markets. The colorimetric-based sensor can provide visual detection at a glance after recognizing the analyte. Additionally, they can function without the use of either conductive surfaces or electrodes, leading to the elimination of sophisticated detection apparatus, miniaturization of the sensor, portability, and wearability. Sensors whose output is a colorimetric signal have proved to be versatile, rapid, and cost efficient with a simple readout.
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