| Summary: | 碩士 === 國立臺灣科技大學 === 光電工程研究所 === 99 === Nanostructural TiO2 were grown on top of RuO2 sitting on sapphire (SA)(100) and SUS substrates by metal organic chemical vapor deposition (MOCVD) using titanium-tetraisopropoxide (TTIP, Ti[OCH(CH3)2]4) and bis(ethylcyclopentadienyl) ruthenium (II) as the source reagents. The growth control conditions and the potential application of the material system as dye-sensitized solar cell were explored.
The surface morphology, structural and spectroscopic properties of the TiO2/RuO2 nanocomposites were characterized by field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), micro-Raman spectroscopy and transmission electron microscopy (TEM). FESEM micrographs showed different growth habits of TiO2/RuO2 heteronanostructures on SA(100) and SUS substrates. XRD results indicated the preferred orientation growth of A-TiO2(110)/RuO2 on SA(100) and SUS substrates, and R-TiO2(001)/RuO2(001) on SA(100) substate. The Raman spectra revealed that nanostructural anatase and/or rutile TiO2 had been deposited on the RuO2 nanocrystals. The TEM image of TiO2-deposited RuO2 nanowire (NW) showed uniform distribution and random direction of TiO2 NCs had been grown on the surface of the RuO2 NWs.
The study of possible application of using A-TiO2/RuO2 nanocomposite grown on the SUS substrate as an electrode for dye-sensitized solar cell has been carried out as well. The photoelectric conversion efficiency of A-TiO2/RuO2 nanocomposite demonstrated an increase from 0.7 to 1.5 % as compared with A-TiO2 electrodes.
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