Abstract
Single-crystalline (sc), rutile TiO2 nanorods with a diameter of 2.5μm were synthesized on transparent conductive fluorine-doped tin oxide (FTO) substrate by hydrothermal method. To enhance the optical absorption to visible wavelength, a 20nm-thick CdS (Eg=2.2eV) film was sensitized on the sc-TiO2 nanorods by chemical bath deposition (CBD). The CdS-sensitized TiO2 nanorods were characterized by field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) to investigate the surface structure and crystalline properties. The results revealed that the TiO2 nanorods had a preferred orientation along the (001) direction, corresponding to small mismatch along the (101) plane at the interfacial region between the TiO2 nanorods and the FTO substrate. The CdS thick film composed of approximately 6nm-sized nanocrystals was completely covered by the TiO2 nanorods. The incident photon-to-current efficiency (IPCE) of the CdS-sensitized TiO2 nanorods was evaluated by the IPCE in S2−/Sx2−-based aqueous electrolyte, with a result of about 9% at a wavelength of 410nm.
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