Spectroscopic and color chromaticity analysis of rhodamine 6G dye-doped PVA polymer composites for color tuning applications

The composite films of polyvinyl alcohol (PVA) incorporating varying concentrations of phenol red (PR) dye were fabricated using the solution casting method. Structural characteristics of the prepared films were explored through XRD and FTIR spectroscopy analyses. The inclusion of PR dye within the PVA matrix induced cross-linking, enhancing the amorphous nature of the doped PVA samples, as evidenced by XRD patterns. In the presence of PR dopants, the FTIR peaks for PVA exhibited altered intensities and increased width, indicating physical interactions between the functional groups of PVA and PR dopants. The impact of PR additives on the optical properties of PVA was investigated across the spectral range of 190-2500 nm. The PVA/phenol red composite demonstrated enhanced UV blocking in the 190-400 nm wavelength range, rendering it suitable for applications such as UV notch filters, including laser blocking filters. The indirect and direct optical band-gaps of PVA polymer films were reduced from 5.20 eV and 5.78 eV to 4.30 eV and 5.28 eV, respectively, with an increase in the PR filling ratio from 0 wt% to 1.8 wt%. The dispersion region of the refractive index was analyzed using the single oscillator model (Wemple-DiDomenico). Calculation and discussion of values such as dispersion and oscillation energies (Ed and Eo), permittivity at infinite frequency (ε∞), and lattice contribution to the dielectric function (εL) of PVA/PR composite films were conducted. These advancements position PVA/PR composite films for potential applications in flexible optoelectronic devices, including light-emitting diodes and photodetectors.

Section: Introductionmentioning

confidence: 80%

Tailoring the optical properties of dye–polymer composite films based on polyvinyl alcohol doped with phenol red toward flexible optoelectronic applications

Al-Muntaser,

Althobiti,

Al Naim

et al. 2024

“…The absorption peaks at 1646, 1606, 1365, 1303 and, 1187 cm −1 were characteristic band of the rhodamine [29]. Also, the absorption bands at 978, 631, 603 and, 445 cm −1 could show the presence of the chemical interaction between NMP and RhB [30].…”

Section: Characterization Of Materialsmentioning

confidence: 90%

“…The absorption band at 2921 cm −1 was indicative of N-H modes, suggesting the presence of amino or amide groups [26]. Furthermore, the bands observed at 1723, 1646, 1606, and 1365 cm −1 were linked to C=O stretching modes, pointing to the existence of carbonyl groups in the film [27][28][29][30]. Lastly, the absorption bands at 1563 and 1497 cm −1 were assigned to C=N bonds and a combination of C-H, C-C, N-H, and C=C modes, offering valuable information about the diverse molecular constituents of the RhB film [26].…”

Section: Characterization Of Materialsmentioning

confidence: 94%

Highly sensitive rhodamine B dye-based electrochemical sensor for lactose detection

Yıldız,

Taşaltın,

Unal

et al. 2024

Lactose (LAC) is the main disaccharide sugar found in milk and dairy products, making it easily accessible as a food source. In addition to its importance for human and animal health, LAC concentrations serve as a biomarker of milk quality. In this study, we reported the detection of LAC using a highly sensitive electrochemical sensor based on rhodamine B (RhB) dye. The prepared RhB-based sensor exhibited excellent characteristics, including a straightforward manufacturing technique, cost-effectiveness, exceptional sensitivity, and selectivity. We conducted a comparative analysis of the electrochemical response of the novel RhB-based sensor, evaluating its electrochemical performance across varying LAC concentrations and when different analyte materials (glucose, fructose, and maltose) were employed. The proposed analytical method was utilized to determine LAC using an electrochemical RhB-based sensor under optimal experimental conditions. As a result, it was experimentally observed that high sensor sensitivity of RhB based sensor against LAC was inversely proportional to the impedance value and directly proportional to conductance which corolated with the transport mechanism of RhB.

“…These results display that the T g decreases as increase in the wt% of MB dye. The T g for pure PVA is mentioned as 64 °C in one of our group's previous articles [41]. The very early valley was obtained around at 100 °C for PNCs which is attributed to discharge of humidity.…”

Section: Afm Analysismentioning

confidence: 95%

Optical structural and thermal studies of TiO₂@ZnO core-shell incorporated methylene blue dye doped PVA polymer nanocomposites

Nandimath,

Bhajantri,

Naik

2023

Self Cite

This manuscript makes an effort to achieve the synthesis of titanium dioxide (TiO2)@ Zinc oxide (ZnO)core@shell also development and study of methylene blue (MB)/TiO2@ZnO/poly(vinyl chloride) (PVA)polymer nanocomposites (PNCs) for optical applications. The PNCs were constructed using easy solution-casting method, advertised good UV–vis and fluorescence properties. The fluorescence emission spectra of MB/TiO2@ZnO/PVA PNCs show the broad peak around 685 nm for both 614 nm and 665 nm excitation wavelengths for all samples and it is observed that the intensity falls off as increase in the dye amount. The x-ray diffraction (XRD) spectra of well-developed PNCs exhibit amorphous nature and the other outcomes obtained by various techniques correlating with each other. Hence, the prepared PNCs can be used for fabricating red light emitting diode (LED) to improve the eye sight of human being.