研究目的
To synthesize ZnS nanowires (ZnS NWs) using thermal evaporation based on vapor-liquid-solid (VLS) method and investigate their optoelectronic and photocatalytic properties, particularly focusing on their application as UVB radiation-oriented photodetectors.
研究成果
The thermal evaporation method successfully synthesized ZnS NWs with excellent optoelectronic and photocatalytic properties. The ZnS NWs-based photodetector demonstrated significant potential for UVB radiation detection, with promising applications in wearable devices for sun exposure monitoring. The photocatalytic activity of ZnS NWs was also enhanced, making them suitable for environmental applications such as dye degradation.
研究不足
The ZnS NWs-based photodetector cannot function under UVA irradiation, limiting its application range. The performance of the photodetector is also dependent on the quality of the electrodes, which could be improved for better results.
1：Experimental Design and Method Selection:
Thermal evaporation based on vapor-liquid-solid (VLS) method was used to synthesize ZnS NWs. The microstructure, chemical compositions, and optoelectronic properties of ZnS NWs were investigated.
2：Sample Selection and Data Sources:
P-type silicon (Si) substrates coated with or without gold (Au) thin films were used to testify the VLS and VS processes.
3：List of Experimental Equipment and Materials:
High quality ZnS powder (99% purity), alumina boat, quartz reactor, X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), field emission scanning electron microscope (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), UV–Vis spectroscopy, cathodoluminescence (CL) detector.
4：Experimental Procedures and Operational Workflow:
ZnS NWs were synthesized via thermal chemical vapor deposition in a horizontal tube furnace. The working pressure and temperature were varied to optimize the synthesis conditions. The synthesized ZnS NWs were characterized using various material analysis techniques.
5：Data Analysis Methods:
The photocurrent gain (Pg), responsivity (Rλ), response time, and recovery time were calculated to evaluate the performance of the ZnS NWs-based photodetector. The photocatalytic activity was assessed by measuring the degradation of methylene blue (MB) under UV irradiation.
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High resolution transmission electron microscope
JEOL JEM-3000F
JEOL
Inspecting the microstructure of the ZnS NWs
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Field emission scanning electron microscope
Zeiss-SIGMA
Zeiss
Taking the surface morphologies of ZnS NWs
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Energy-dispersive X-ray spectroscopy
Bruker
Bruker
Characterizing the chemical composition of ZnS NWs
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X-ray photoelectron spectroscopy
Perkin-Elmer model PHI 1600
Perkin-Elmer
Identifying the chemical composition and bonding of specimen surface
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Cathodoluminescence detector
JEOL JSM-7001F
JEOL
Measuring the CL properties of the ZnS NWs
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Electrometer
Keithley 4200A
Keithley
Measuring the photocurrent and current–voltage (I–V) curves
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X-ray diffraction
PANalytical
Examining the crystal structure of the ZnS NWs
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UV–Vis spectroscopy
RENISHAW inVia
RENISHAW
Recording UV–Vis spectra
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