화학공학소재연구정보센터
Applied Surface Science, Vol.358, 443-448, 2015
Photocurrent enhancement in hybrid cadmium sulfide/conjugated polyaniline nanofiber composites by introducing iodine
In this paper, the effect of iodine on the photocurrent of conjugated polymer/inorganic semiconductor nanocomposites is investigated. Via a redox process, iodine nanoparticles are coated on the surface of highly active nanofiber of conjugated polyaniline (PANI), forming an electron donor (i.e., I-2@PANI). After subsequent incorporation of CdS nanoparticles (serving as electron acceptors), the photocurrent of the I-2@PANI-CdS system is greatly enhanced as compared to that of the PANI-CdS hybrid. This obvious enhancement is due to the fact that the existence of I-2 causes significant improvement in the charge transfer, which has favorable penetration ability into the porous semiconductor film, fast charge transfer and relatively slow recombination with injected photoelectrons. As a result, the total concentration of charge carriers in the CdS nanoparticles may increase as compared to that in bulk CdS. As a result, the photocurrent of CdS in I2@PANI-CdS nanocomposites is remarkably enhanced. (C) 2015 Elsevier B.V. All rights reserved.