Abstract
Tuning photophysical properties of poly[bis(4-butypheny)-bis(phenyl)benzidine] (poly-TPD) by addition multi walled carbon nanotubes (MWCNTs) with different weight ratios is demonstrated. The solution blending method followed by spin coating technique was used to successfully prepare thin films of poly-TPD/MWCNTs. Fourier transform infrared spectroscopy (FTIR) revealed the interaction between poly-TPD and MWCNT. UV–Vis and photoluminescence spectrophotometer were used to determine the optical properties. No chemical interaction was detected between poly-TPD and MWCNTs in their ground states, as evidenced by the absence of new peaks in FTIR and absorption spectra. The nanocomposites showed reduced direct (Egd) and indirect (Egi) energy band gaps values, while Urbach energy (Eu) values increased with increasing MWCNT doping, resulting in a narrower optical energy band gap width and an increase in localized energy levels that act as electron traps in the band gap. The charge transfer from poly-TPD to MWCNTs was evidenced by the reduction in poly-TPD emission, as well as changes in both the values of Stokes shift and vibronic spacing energy in the nanocomposite system. The parameters of the Stern–Volmer quenching constant (kSV), fluorescence lifetime (τ) of excited poly-TPD in the presence of MWCNTs, photo-induced electron-transfer rate (kET), and bimolecular quenching rate (kq) can be adjusted to further enhance efficient charge transfer between poly-TPD and MWCNTs.
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The author extend his appreciation to the Deputyship for Research & Innovation, “Ministry of Education in Saudi Arabia for funding this research work through the project no. (IFKSUOR3–024–1)”.
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Al-Asbahi, B.A. Effect of Multiwalled Carbon Nanotube Contents on Photophysical Properties of Poly-TPD/MWCNT Nanocomposites. J Inorg Organomet Polym 33, 2552–2561 (2023). https://doi.org/10.1007/s10904-023-02706-9
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DOI: https://doi.org/10.1007/s10904-023-02706-9