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<p>The chemical modification, microstructural evolution and optical response of poly (methyl methacrylate) thin films grown on indium tin oxide-coated glass and polyethylene terephthalate substrates are reported. Spin-coated thin films are prepared by dissolving PMMA in different concentrations of chloroform and anisole. Raman spectroscopy reveals spinning speed and solvent concentration dependent chemical chain modification, conformation, chain orientation, and local order. A critical value of spinning speed and concentration of chloroform is required for the C–H stretching modes of the methyl and methylene groups, to appear. The peaks corresponding to the carbonyl group dominate, when the solvent is anisole. In general, chloroform suppresses the formation of methyl and methylene groups while anisole aids the formation. The microstructural evolution is strongly dependent on solvent and substrate. PMMA films on ITO-coated glass are smooth at 2 and 4% w/v of chloroform independent of spinning speed, but microporous at 8% w/v. All the films on ITO-coated PET are nano/micro porous, independent of spinning speed and chloroform concentration. In the case of anisole as solvent, the films are smooth independent of substrate, solvent concentration and spinning speed. The optical transmission studies in the wavelength range of 200–2500&#xa0;nm reveal that deposition of the PMMA films on the ITO-coated glass or PET substrates leads to an overall transmission increase in the NIR region (&gt; 1000&#xa0;nm). Spin coating can, thus, be used to achieve device quality PMMA films for optical and electronic applications on rigid and flexible substrates.</p>

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Solvent mediated chemical modification, microstructure and optical response of poly (methyl methacrylate) thin films grown on indium tin oxide coated glass and polyethylene terephthalate substrates

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • M. Rahul,
  • M. Ghanashyam Krishna

摘要

The chemical modification, microstructural evolution and optical response of poly (methyl methacrylate) thin films grown on indium tin oxide-coated glass and polyethylene terephthalate substrates are reported. Spin-coated thin films are prepared by dissolving PMMA in different concentrations of chloroform and anisole. Raman spectroscopy reveals spinning speed and solvent concentration dependent chemical chain modification, conformation, chain orientation, and local order. A critical value of spinning speed and concentration of chloroform is required for the C–H stretching modes of the methyl and methylene groups, to appear. The peaks corresponding to the carbonyl group dominate, when the solvent is anisole. In general, chloroform suppresses the formation of methyl and methylene groups while anisole aids the formation. The microstructural evolution is strongly dependent on solvent and substrate. PMMA films on ITO-coated glass are smooth at 2 and 4% w/v of chloroform independent of spinning speed, but microporous at 8% w/v. All the films on ITO-coated PET are nano/micro porous, independent of spinning speed and chloroform concentration. In the case of anisole as solvent, the films are smooth independent of substrate, solvent concentration and spinning speed. The optical transmission studies in the wavelength range of 200–2500 nm reveal that deposition of the PMMA films on the ITO-coated glass or PET substrates leads to an overall transmission increase in the NIR region (> 1000 nm). Spin coating can, thus, be used to achieve device quality PMMA films for optical and electronic applications on rigid and flexible substrates.