article · Journal of Macromolecular Science Part B
Researchers prepared a nanocomposite film combining polyaniline, polyvinyl pyrrolidone, and zinc sulfide nanoparticles using chemical coprecipitation and ex-situ casting. The zinc sulfide nanoparticles formed a cubic zinc blende structure. The films were then exposed to infrared pulsed laser radiation at fluences between 3 and 18 J/cm2. Testing via ultraviolet spectroscopy and colour difference methods showed that laser exposure altered the optical and colour properties of the material. Both direct and indirect optical bandgaps decreased as the laser fluence increased, while optical transitions remained indirect allowed transitions. The irradiation also altered key optical parameters, including absorbance, transmission, refractive index, extinction coefficient, dielectric properties, and optical conductivity. These laser-driven modifications demonstrate that infrared pulsing can adjust the material properties of the composite.
Being able to tune the optical and electrical properties of materials using lasers offers a precise method to tailor thin films without complex chemical redesigns. By demonstrating that pulsed infrared laser light systematically adjusts the colour, conductivity, and light absorption of polymer nanocomposites, this study identifies a practical mechanism to modify materials for advanced light-based technologies.
The findings suggest potential application in optoelectronic devices, pointing towards hardware developers and manufacturers seeking tunable polymer nanocomposites. However, this work remains early-stage laboratory research, as it focuses on material synthesis and property characterisation without demonstrating prototype components or manufacturing integration.
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A nanocomposite (NC) of polyaniline (Pani), polyvinyl pyrrolidone (PVP) and zinc sulfide (ZnS) nanoparticles (NP) was prepared using chemical coprecipitation and ex-situ casting procedures. ZnS NP were synthesized using the chemical coprecipitation technique in atmospheric air. The x-ray diffraction (XRD) scans indicated that the synthesized ZnS had a nanonature and fit the cubic zinc blended structure. We used an infrared pulsed laser to irradiate the Pani/PVP/ZnS NC samples with fluences ranging from 3 to18 J/cm2. The induced changes in the NC were investigated using the UV spectroscopy and International Commission on Illumination (CIE) color difference methodology. When the laser fluence increased up to 18 J/cm2 both the direct and indirect optical bandgaps (Eg) decreased. Additionally, we used the optical dielectric loss (ε") to detect the type of microelectronic transition for the NC samples. The Eg of the exposed NC samples and the pristine samples exhibited indirect allowed transitions. The laser effects on the absorbance, extinction coefficient, transmission, refractive index, dielectric parameters and optical conductivity of the NC were studied. Lastly, the color differences between the pristine and exposed samples were determined. The pristine Pani/PVP/ZnS showed a significant color difference with the laser irradiated samples. The changes of the studied optical parameters with the laser fluence indicated that the laser radiation represents a convenient tool that would allow the application of Pani/PVP/ZnS NC in optoelectronic devices.
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DOI: 10.1080/00222348.2023.2284565
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