Multifunctional Electrospun Nanofibers Prepared from Poly((N‐isopropylacrylamide)‐co‐(N‐hydroxymethylacrylamide)) and Their Blends with 1,2‐Diaminoanthraquinone for NO Gas Detection

Abstract

Multifunctional electrospun (ES) nanofibers are successfully prepared from blends of poly((N‐isopropylacrylamide)‐co‐(N‐hydroxymethylacrylamide)) (poly(NIPAAm‐co‐NMA)) with NO(g)‐responsive 1,2‐diaminoanthraquinone (DAQ). Different compositions of poly(NIPAAm‐co‐NMA) are synthesized by free radical polymerization. The NMA content significantly affects the stability of the ES nanofibers in water and the NO(g) detection due to a change of the hydrophilic/hydrophobic characteristics. In addition, the fibers exhibit a significant volume (or hydrophilic/hydrophobic) change during the heating and cooling cycle between 25 and 50 °C, attributed to the lower critical solution temperature (LCST) characteristic of the thermoresponsive NIPAAm moiety. On the other hand, a distinct on/off switching of the optical absorption spectra and high color contrast on detecting the NO(g) are observed using the ES nanofibers of poly(NIPAAm‐co‐NMA)/DAQ blends. The high surface/volume of ES fibers enhance the sensitivity and responsive speed, compared with that of drop‐cast film. The above studies suggest that the prepared multifunctional ES nanofibers have potential applications in environmentally sensing devices.

Pyrene or rhodamine derivative–modified surfaces of electrospun nanofibrous chemosensors for colorimetric and fluorescent determination of Cu 2+ , Hg 2+ , and pH

“…Furthermore, the Fiber-g-PyDAN2 ES nanofibers exhibited excellent organic solvent-resistance because they maintained their morphologies after they were immersed in several solvents ( Fig. 6(b)-(e)) [29,31,34]. Fig.…”

“…All experiments were conducted at room temperature and a relative humidity of approximately 30%. The ES nanofibers were annealed at 100°C for 24 h in an oven for chemical cross-linking, as described by our previous reports [31,34,36]. Immobilization of the ATRP initiators on the surfaces of the fibers was achieved by the reaction of 2-bromoisobutyryl bromide with the hydroxyl groups of the fibers in the presence of triethylamine.…”

“…Each measurement was maintained for 15 min to ensure that an equilibrium of the chelating reaction was reached. All PL spectra of the ES fibers were recorded using the Fluorolog-3 spectrofluorometer and excited at a suitable wavelength, as described in our previous studies [27][28][29][30][31][32][33][34].…”

“…The high surface-to-volume ratio of ES nanofibers has motivated extensive studies on sensory applications [27][28][29][30][31][32][33][34]. Recently, we have prepared various fluorescent sensor-based ES polymer nanofibers for sensing pH levels [27], temperatures [28][29][30], NO gases [31], and metal ions [30,[32][33][34]. For example, novel multifunctional fluorescent ES nanofibers from poly{2-{2-hydroxyl-4-[5-(acryloxy)hexyloxy]phenylbenzoxazole}-co-(N-isopropylacrylamide)-co-(stearylacrylate)} (poly(HPBOco-NIPAAm-co-SA)) exhibited distinct on-off photoluminescence (PL) switching for sensing various pH levels, temperatures, and metal ions [30].…”

Silver Nanoparticles Loaded Thermoresponsive Hybrid Nanofibrous Hydrogel as a Recyclable Dip‐Catalyst with Temperature‐Tunable Catalytic Activity

“…PNN was first synthesized via AIBN initiated free radical copolymerization of NIPAM and NMA in ethanol solvent according to ref. . The molar ratio of N ‐isopropylacrylamide to N ‐hydroxymethylacrylamide in the feed recipe was 10:1.Then, certain amount (6, 12, or 24 mg) of AgNO 3 dissolved in 1 mL water was added into 2 mL of 37.5 wt% PNN aqueous solution.…”