Generation of photo charge in poly(ethyleneimine)-TiO2-anthocyanin modified papers conditioned at different humidities. (February 2018)

• Record Type: Journal Article
• Authors: Škipina, B.; Luyt, A.S.; Csóka, L.; Djoković, V.; Dudić, D.
• Is Part Of: Dyes and pigments. Volume 149(2018)
• Page Start: 51
• Page End: 58
• Publication Date: 2018-02
• Subjects: Anthocyanin -- TiO2 -- Cellulose -- Photodielectric -- Humidity; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.08.064
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: The article describes the influence of humidity on the surface photodielectric properties of papers prepared from poly(ethyleneimine)-TiO2 nanoparticles-anthocyanin modified cellulose fibres. The anthocyanins were extracted from purple cabbage, beet-root, plum peel, red wine and red currant juice. The samples were conditioned to various relative humidities (from 9 to 100%) and illuminated with white visible light, λ ≥ 405 nm. The poly(ethyleneimine)-TiO2 -anthocyanin modified samples showed similar photodielectric behaviour that can be clearly distinguished from the samples modified solely with poly(ethyleneimine)-TiO2 . Generally, an increase in humidity enhances the conductivity of the samples and induces an increase in the amount of photo-induced charge. Also, at higher humidities (above 80%), the samples with anthocyanin showed significantly higher values of photo-induced charges with respect to anthocyanin free samples. The presented results suggest that the presence of water molecules promotes electron-injection processes from the anthocyanin to the semiconductor surface.