Abstract
RuS 2 (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 TiO 2 electrodes coated with RuS 2 colloids was also investigated. These electrodes showed spectral sensitization effect by RuS 2 on TiO 2 with an increase in the photocurrent response of TiO 2 towards longer wavelength spectral region. Photocurrent action spectra of these electrodes qualitatively suggested a band-gap of approximately 2.2–2.8 eV for RuS 2, 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/AgCl) for these samples.
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