Enhanced ultraviolet fluorescence in surface modified ZnO nanostructures: Effect of PANI

T Pandiyarajan; R V Mangalaraja; B Karthikeyan

doi:10.1016/j.saa.2015.02.088

Enhanced ultraviolet fluorescence in surface modified ZnO nanostructures: Effect of PANI

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Aug 5:147:280-5. doi: 10.1016/j.saa.2015.02.088. Epub 2015 Feb 26.

Authors

T Pandiyarajan¹, R V Mangalaraja¹, B Karthikeyan²

Affiliations

¹ Advanced Ceramics and Nanotechnology Laboratory, Department of Materials Engineering, Faculty of Engineering, University of Concepcion, Concepcion, Chile.
² Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India. Electronic address: [email protected].

PMID: 25847790
DOI: 10.1016/j.saa.2015.02.088

Abstract

ZnO:polyaniline nanocomposite (ZnO:PANI) films were prepared and their steady state fluorescence and time resolved photoluminescence properties were discussed. X-ray diffraction and infrared spectroscopy analyses confirmed the interaction and formation of ZnO:PANI composite films. Optical absorption spectrum of pure PANI showed two bands at 325 and 625 nm which were ascribed to π→π(∗) transition in the benzoid and exciton formation in the quinoid rings, respectively. Pure ZnO nanoparticles exhibited a band at 369 nm was due to their exciton absorption and the composite films showed a broad band in the visible region and small intensity band at the UV region. Fluorescence spectra showed that the ultra violet emission of ZnO was enhanced about tenfold due to the electron transfer from PANI to ZnO nanoparticles and the suppression of visible emission was attributed to the surface passivation effect. The transfer of electron from PANI to ZnO and its decay dynamics were experimentally analyzed through time resolved fluorescence measurements.

Keywords: PANI; Surface modified ZnO; Time resolved fluorescence; Ultraviolet emission.

Publication types

Research Support, Non-U.S. Gov't