研究目的
Investigating the fabrication and properties of ZnO/TiO2 core–shell nanostructures for application as photoanodes in dye-sensitized solar cells.
研究成果
Well-arrayed ZnO/TiO2 core–shell nanorods were successfully fabricated on AZO substrates using mist CVD. The TiO2 shells were confirmed as pure anatase phase, contributing to high chemical stability as photoanodes. The surface area of the ZnO nanorods increased with TiO2 coating time, and the transmittance remained high (65% after 15 min of coating). These nanostructures show promise for improving the power conversion efficiency of DSSCs due to their high transmittance, electron transfer capabilities, chemical stability, and large surface area for dye absorption.
研究不足
The study focused on the fabrication and characterization of ZnO/TiO2 core–shell nanostructures but did not test their performance in actual dye-sensitized solar cells (DSSCs). The optimization of coating parameters and the scalability of the mist CVD method for industrial applications were not addressed.
1：Experimental Design and Method Selection:
The study employed mist chemical vapor deposition (mist CVD) to coat ZnO nanorods with TiO2 particles, aiming to fabricate ZnO/TiO2 core–shell nanostructures. The method was chosen for its ability to produce uniform and pure anatase phase TiO2 coatings.
2：Sample Selection and Data Sources:
ZnO nanorods were fabricated on aluminum oxide-doped ZnO (AZO) substrates using chemical bath deposition (CBD). The substrates were then coated with TiO2 using mist CVD under various coating times.
3：List of Experimental Equipment and Materials:
Equipment included a field emission scanning electron microscope (FESEM, SU-8020, Hitachi), energy dispersive X-ray spectroscopy (EDS, X-Max, Horiba), grazing incidence X-ray diffraction (GIXRD, ATX-G, Rigaku), Raman spectroscopy (LabRAM HR-800, Horiba Jobin Yvon), spectrophotometer (U-4100, Hitachi), and micro-PL/Raman spectroscope (iHR-320, Horiba). Materials included Zn(NO3)2, hexamethylenetetramine (HMTA), titanium tetraisopropoxide (TTIP), and ethanol.
4：Experimental Procedures and Operational Workflow:
ZnO nanorods were grown on AZO substrates via CBD, then coated with TiO2 using mist CVD at 400°C with varying coating times. The properties of the resulting nanostructures were characterized using the aforementioned equipment.
5：Data Analysis Methods:
The structural, morphological, optical, and photoluminescence properties of the ZnO/TiO2 core–shell nanostructures were analyzed using GIXRD, SEM, EDS, Raman spectroscopy, PL spectroscopy, and transmittance measurements.
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