期刊
VACUUM
卷 184, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2020.109985
关键词
Pulsed laser deposition; Needle-like heterostructure TiO2/CdS; Photoelectrochemical properties
资金
- National Natural Science Foundation of China [51562033, 21203150]
- Fundamental Research Funds for the Central Universities [31920190078]
Researchers improved the photoelectrochemical properties of TiO2/CdS composite nanorod electrodes through a one-step quantum dot synthesis and assembly process. Using pulsed laser deposition, CdS quantum dots were successfully grown on TiO2 nanorods, forming stable TiO2/CdS heterostructures.
To improve the photoelectrochemical properties of TiO2/CdS composite nanorod electrodes, we developed a one-step quantum dot (QD) synthesis and assembly process based on pulsed laser deposition (PLD). An advantage of this method is that it does not involve ligand-exchange processing or wet chemical methods that might destabilize the QD attachment. By using PLD, CdS QDs were successfully grown on a dense array of TiO2 nanorods, forming needle-like heterostructures whose photophysics depends on the laser pulse energy. The XRD results indicated that the products were composed of the tetragonal rutile, TiO2 and hexagonal CdS. The TiO2/CdS heterostructures fabricated with this method are very stable and exhibit promising photoelectrochemical characteristics for photovoltaic applications. The best results are obtained for a PLD laser pulse energy of 300 mJ, which produces TiO2/CdS heterostructure nanorod electrodes that, when illuminated at AM 1.5 G, have a photocurrent density exceeding 4.7 mA cm(-2) at 0 V versus a saturated calomel electrode.
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