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article
Optical and electrical analysis of Rhodamine 110 chloride/PVA-PEG for smart and flexible optical sensor technology
Abstract
<jats:title>Abstract</jats:title><jats:p>Polyvinyl alcohol (PVA)/Polyethylene glycol (PEG) (90:10 wt%) polymeric nanocomposite films were prepared via a simple casting technique with Rhodamine 110 chloride (Rh-110) dye for optoelectronics with various weight ratio percentages (0, 0.06, 0.1,0.2, 0.4, 0.6 1.25, 2 and 4.0 wt %) of Rh-110doped PVA/PEG polymeric blend composite films. The produced films have been studied with instruments like (XRD and FT-IR) spectroscopic methods, UV-visible-NIR spectrophotometer, and dielectric spectroscopy. The absorbance (Abs) and transmittance T(λ) were measured and analyzed. Absorption spectra in multiple bands are generated between 215 and 620 nm when Rh-110 is added to the PVA-PEG matrix, according to the examination of transmittance curves of Rh-110 /PVA-PEG. Rh-110 / PVA-PEG has a transmittance CUT-OFF in the 200–550 nm wavelength range, making it ideal for He–Ne lasers with wavelengths of 532.8 nm. Doping (PVA-PEG) with Rh-110 resulted in a reduction of the multi-optical energy band gap (Eg) from 4.5 eV to 1.73 eV for the allowed indirect transitions. Reduced metallization criterion (from 0.47 to 0.34) suggest that concentration-dependent electronic mobility enhancement in the dye-doped films led to incremental improvements in conductivity. Values for the EU were raised from 1.05 meV to 5.64 meV. The refractive index values of the materials have been determined using the Kumar-Singh, Moss, Reddy, and Anani relationships. AC conductivity, dielectric constant, and dielectric loss were studied. In addition, the (ε^',ε^'')values at 100 Hz for the pure blend and 4 wt% Rh110 dye improved from (72.53,10.95) for PVA to (127.14, 36.23), respectively. As a result, the synthesized Rh-110/PVA-PEG polymeric films may be used in various promising and practical optoelectronic applications, including lasers, optical filters, optical communication, light-emitting diodes, and optical switching.</jats:p>