Photochemical properties of PbS microcrystallites prepared in Nafion

Abstract

PbS microcrystallites ranging from 16 to 40 Å were prepared in Nafion; band gaps were determined from absorption spectra. The maximal hypsochromic shift achieved by the size quantization was ca. 1.7 eV. The onset potential of anodic photocurrents at Nafion-coated electrodes with the incorporated PbS shifted cathodically with an increase in the band gap, and it satisfied the hyperbolic band theory concerning the band gap variations with the size quantization. Fluorescence of PbS microcrystallites was greatly influenced by solvents into which PbS-incorporated Nafion was immersed, as in the case of CdS-incorporated Nafion.