Journal article

SEMICONDUCTOR SENSITIZATION BY RUS2 COLLOIDS ON TIO2 ELECTRODES

M ASHOKKUMAR, A KUDO, N SAITO, T SAKATA

CHEMICAL PHYSICS LETTERS | ELSEVIER SCIENCE BV | Published : 1994

Abstract

RuS2 (n-type) colloids were prepared in sulfolane by a new technique. Diluted ruthenium disulfide colloidal suspension in sulfolane showed green photoluminescence. The photoelectrochemical behavior of TiO2 electrodes coated with RuS2 colloids was also investigated. These electrodes showed spectral sensitization effect by RuS2 on TiO2 with an increase in the photocurrent response of TiO2 towards longer wavelength spectral region. Photocurrent action spectra of these electrodes qualitatively suggested a band-gap of approximately 2.2-2.8 eV for RuS2, quite wider than that of the bulk material showing size quantization effect. I-V measurement showed a flat-band potential of ≈ -0.15 V (versus Ag/..

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