Abstract
Theεr′ of PMMA-grafted ZnO nanoparticles was greatly enhanced by irradiation of UV light owing to Maxwell–Wagner polarization of the resultant free electrons.
Highlights
View Article OnlinePoly(methyl methacrylate)-grafted ZnO nanocomposites with variable dielectric constants by UV light irradiation
Dielectric materials are usually used to store electrical energy as capacitors.[1]
poly(methyl methacrylate) (PMMA)–ZnO is electrically insulated by the grafted PMMA chains on the ZnO nanoparticles
Summary
Poly(methyl methacrylate)-grafted ZnO nanocomposites with variable dielectric constants by UV light irradiation. A series of poly(methyl methacrylate)-grafted ZnO nanoparticles (PMMA–ZnO) were synthesized using a surface-initiated polymerization technique and the optical and dielectric properties of PMMA–ZnO were studied. The dielectric constant er[0] of PMMA–ZnO thin films was highly increased by irradiation of UV light. The dissipation factor (tan d) of PMMA– ZnO is very low and almost constant during UV irradiation because PMMA–ZnO is electrically insulated by the grafted PMMA chains on the ZnO nanoparticles. It was confirmed that due to the grafted PMMA chains, PMMA–ZnO nanocomposites exhibited low light scattering in addition to strong absorption of UV light. The low light scattering of PMMA–ZnO would enhance the absorption efficiency of UV light and contribute to the large increase in er[0] for PMMA–ZnO. PMMA–ZnO is a promising material for high sensitivity and low loss UV light sensors using the change in er[0]
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