A Spiropyran-Doped Poly(methyl methacrylate) Matrix for Sensor Applications

Abstract

In this paper, the relaxation isomerization properties of a spiropyran-doped poly(methyl methacrylate) (PMMA) UV light-responsive dynamic material are presented. The polar liquid (acetonitrile) and solid (PMMA matrix) medium may contain two merocyanine isoforms of the selected spiropyran. A complex equilibrium of the colored and colorless spiropyran isoforms resulted in specific transformations of the absorption spectra during the relaxation process. Bands at 522 nm and 580 nm characterized the absorption of the fabricated dynamic material in the ground (non-activated) state in the visible range. The presence of colored and colorless isoforms of spiropyran incorporated into the PMMA matrix using Raman spectroscopy was revealed. The photosensitive polymer samples were irradiated with a UV LED (365 nm and 390 nm) under various temperatures (0–30 °C). Spectral changes within the relaxation process demonstrated their complex dynamics. Surprisingly, the photodegradation of the dynamic material was estimated at about 25% (using 390 nm) and 7% (using 365 nm) after eight photoswitch cycles for one isoform, and no fatigue after an additional one (using 390 nm) was discovered. The presented light-responsive material is of interest for UV sensors and new hybrid material design.

Sunlight-Sensitizing Switchable Photochromic Transparent Aesthetic Wood for Smart Windows

“…SPTW-P exhibits a broader UV–vis light absorption band, ranging from 682 to 200 nm (Figure a), in relation to that of DW-P, OP, and PMMA. Previous research has stated that the ring-open form of conjugated merocyanine (MC), being neutral, can interact effectively with a polar polymer matrix. ,− Moreover, the weak hydrogen bond interaction between the microencapsulated PMMA and hydroxyl of cellulose in the DW-P template is confirmed by FTIR (Figure b). Therefore, the broader UV–vis light absorption of SPTW-P can be attributed to the effect between these three components via hydrogen bonds, as shown in Figure f.…”

Re-crystallization in Glass Supported MgO Quantum Dot Doped PMMA Film: Effect of Annealing Hours and Composition

“…Owing to their enhanced as well as unique functional properties, the polymer nanocomposites have found applications in making optical lenses, UV shields, light emitting diodes, photo-detectors, solar cells, sensors, super-capacitors, random lasers and anti-corrosion and protective layers [7]. Spiropyran-doped poly(methylmethacrylate) is a light responsive materials and can be used as UV-sensors [9]. Palladium nanoparticles doped polymer microfiber functioned as a hydrogen probe can be used as hydrogen sensors [10].…”