Interaction between poly(vinyl pyrrolidone) PVP and fullerene C60 at the interface in PVP-C60 nanofluids_A spectroscopic study

International Conference on Recent Advances in Materials, Mechanical and Civil Engineering

材料科学;机械制造;土木建筑工程

Behera, M.^1 ; Ram, S.^2

Chemistry Department, Silicon Institute of Technology, Bhubaneswar

751 024, India^1

Materials Science Centre, Indian Institute of Technology, Kharagpur

721 302, India^2

关键词: Charge transfer complex;    Donor-acceptor complex;    Fourier transform infra reds;    Light emission spectra;    Lowest unoccupied molecular orbital;    Microscopic interaction;    Poly vinyl pyrrolidone;    Solar-cell applications;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/330/1/012016/pdf
DOI  :  10.1088/1757-899X/330/1/012016

来源: IOP

【 摘 要 】

Fourier transform infrared and Raman bands shows a discernible enhancement in band intensity of C-H stretching, C=O stretching, C-N stretching, C-H2bending, and C-H2in-plane bending in PVP molecules in the presence of C60molecules. Amplification in intensity is ascribed to microscopic interactions results when a donation of nonbonding electron (n) occurs from a ">N-C=O" entity of PVP into a lowest unoccupied molecular orbital of the C60molecule in PVP-C60charge transfer (CT) complex. The C=O stretching band intensity (integrated) Vs C60content plot exhibits a peak near a critical 13.9 μM C60value owing to percolation effect. Light emission spectra show that even a small addition of 4.63 μM C60able to suppress the band intensity by ∼23% as a result of an energy loss. The integrated band intensity also decreases through a peak near 13.9 μM when plotted against the C60-content. In correlation to the vibration spectra, the maximum effect observed both in light emission and excitation spectra suggests a percolation effect in the CT complex. Exhibition of percolation threshold in C60-PVP donor-acceptor complex will be helpful in optimizing the photovoltaic properties vital for solar cell applications.