ZnSe quantum dot-embedded polymer nanocomposites for enhanced UV photodetectors

This study investigates the preparation and characterization of hydrothermally synthesized MPA-capped ZnSe quantum dots (QDs)-incorporated methyl cellulose (MC) polymer nanocomposites (PNCs). ZnSe QDs at different weight percentages (wt%) were dispersed in MC using solution casting method, and the resulting PNCs were systematically analyzed for their optical and structural properties via UV–Vis absorbance spectroscopy, Spectro-fluorophotometry, and X-ray diffraction (XRD). To further elucidate the interaction mechanisms between the QDs and the MC matrix, Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were employed, providing insights into functional group interactions and elemental composition. Morphological analysis via Field Emission Scanning Electron Microscopy (FESEM) revealed particle dispersion and size distribution within the polymer matrix. The optical performance of the PNCs was evaluated through their emission characteristics and photo-activation behavior under various UV excitation wavelengths, as well as under alternating dark and light conditions. Notably, the ability of these PNCs to convert UV light to visible wavelengths presents significant potential for enhancing the efficiency of conventional photodetectors. The study further unlocks opportunities for developing fluorometric UV sensors by harnessing the photo-activation behavior of PNCs.