<p>In the current work, emphasis was laid on developing eco-friendly films suitable for optoelectronic applications. Chitosan (CH), a polysaccharide was blended with a biodegradable and synthetically obtained copolymer, Poly (1-vinyl pyrrolidone-co-vinyl acetate) (PVPcoVA). This host matrix was reinforced by the addition of the highly efficient, multiwalled carbon nanotubes (MWCNT). The effect of the MWCNT on the tensile, structural, morphological, fluorescent, and conducting properties of the CH/PVPcoVA base matrix was extensively studied through various techniques. The findings showed promising results with the intensification in the flexibility of the films with subsequent addition of MWCNTs. The enhanced dispersion of the MWCNT into the base matrix led to a decline in the crystallinity of the films rendering a pathway for increased conduction of the films. The UV–Vis spectra gave a picture about the transitions corresponding to the <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_15058_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="55" /> </InlineMediaObject> <EquationSource Format="TEX">$\text{n}\to {\uppi }^{}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>n</mtext> <mo stretchy="false">→</mo> <mmultiscripts> <mrow> <mi mathvariant="normal">π</mi> </mrow> <mrow /> <mrow> <mrow /> <mo>∗</mo> </mrow> </mmultiscripts> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_15058_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="57" /> </InlineMediaObject> <EquationSource Format="TEX">$\uppi \to {\uppi }^{}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">π</mi> <mo stretchy="false">→</mo> <mmultiscripts> <mrow> <mi mathvariant="normal">π</mi> </mrow> <mrow /> <mrow> <mrow /> <mo>∗</mo> </mrow> </mmultiscripts> </mrow> </math></EquationSource> </InlineEquation> attributed to the presence of a charge transfer group. The optical bandgap energies of the films were observed to decline with a higher loading of MWCNT into the host matrix. The indirect bandgap energy was found to reduce to 1.90 eV from the 2.10 eV and the direct optical bandgap energy reduced from 4.05 eV to 3.85 eV. The films also displayed an amplification in the values of conductivity describing a maximum conductivity in the order 10<sup>–3</sup> S/cm. These findings suffice the fact that the MWCNT reinforced films can be readily incorporated in the field of optoelectronics as well conductivity.</p>

Carbon nanotubes reinforced chitosan/poly (1-vinylpyrrolidone-co-vinyl acetate) films: a sustainable approach for optoelectronic applications

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发表日期：

2025年6月16日

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Jennifer P. Pinto,
Mallikarjun H. Anandalli,
Ajitkumar Appayya Hunashyal,
Priyadarshini,
Saraswati P. Masti,
Ravindra B. Chougale,
Veda Gudihal,
Rajashekhar F. Bhajantri

摘要

In the current work, emphasis was laid on developing eco-friendly films suitable for optoelectronic applications. Chitosan (CH), a polysaccharide was blended with a biodegradable and synthetically obtained copolymer, Poly (1-vinyl pyrrolidone-co-vinyl acetate) (PVPcoVA). This host matrix was reinforced by the addition of the highly efficient, multiwalled carbon nanotubes (MWCNT). The effect of the MWCNT on the tensile, structural, morphological, fluorescent, and conducting properties of the CH/PVPcoVA base matrix was extensively studied through various techniques. The findings showed promising results with the intensification in the flexibility of the films with subsequent addition of MWCNTs. The enhanced dispersion of the MWCNT into the base matrix led to a decline in the crystallinity of the films rendering a pathway for increased conduction of the films. The UV–Vis spectra gave a picture about the transitions corresponding to the $\text{n}\to {\uppi }^{*}$ $n \to π^{*}$ and $\uppi \to {\uppi }^{*}$ $π \to π^{*}$ attributed to the presence of a charge transfer group. The optical bandgap energies of the films were observed to decline with a higher loading of MWCNT into the host matrix. The indirect bandgap energy was found to reduce to 1.90 eV from the 2.10 eV and the direct optical bandgap energy reduced from 4.05 eV to 3.85 eV. The films also displayed an amplification in the values of conductivity describing a maximum conductivity in the order 10^–3 S/cm. These findings suffice the fact that the MWCNT reinforced films can be readily incorporated in the field of optoelectronics as well conductivity.