研究目的
Investigating the field emission properties and photoluminescence of Au nanoparticles decorated ZnO nanowires to understand the electron transport mechanism between ZnO and Au nanoparticles.
研究成果
Au nanoparticles decoration on ZnO nanowires leads to quenching of both band edge and visible emissions and increases the turn-on field for field emission. These phenomena are attributed to electron transfer from ZnO to Au nanoparticles, suggesting a significant impact of Au decoration on the electronic properties of ZnO nanowires.
研究不足
The study does not provide evidence of Au nanoparticles on the top of the nanowire tip, which could be crucial for understanding the field emission mechanism. The distribution of Au nanoparticles becomes more disperse with longer sputtering times, which might affect the uniformity of field emission properties.
1：Experimental Design and Method Selection:
The study involved preparing ZnO nanowires decorated with Au nanoparticles using DC magnetron sputtering followed by an annealing process. The size and density of Au nanoparticles were tuned by varying the sputtering time.
2：Sample Selection and Data Sources:
ZnO nanowires were grown on ITO glass substrates, and Au nanoparticles of different sizes were decorated on their surface.
3：List of Experimental Equipment and Materials:
Scanning electron microscope (SEM) for inspection, photoluminescence (PL) spectrometer for measurements, ultraviolet photoelectron spectroscopy (UPS) for work function measurement, and a diode structure in a vacuum chamber for field emission properties measurement.
4：Experimental Procedures and Operational Workflow:
The process included deposition of zinc metal thin films, growth of ZnO nanowires, decoration with Au nanoparticles, and subsequent characterization and measurement of properties.
5：Data Analysis Methods:
Statistical analysis of Au nanoparticles size and density, comparison of PL spectra, and evaluation of field emission properties.
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