研究目的
Investigating the antifungal activity of silver particles prepared by dewetting Ag films coated on glass using a fiber laser against Colletotrichum gloeosporioides, a fungus spore associated with the anthracnose disease of mango.
研究成果
Silver particles prepared by dewetting Ag films coated on glass using a fiber laser have an excellent inhibitory ability on Colletotrichum gloeosporioides. The conidia growth suppression effect increased with increasing Ag particle sizes and contact times. The largest particle size of 1.2 μm achieved 100% fungistatics within a contact time of 5 min.
研究不足
The study focuses on the antifungal activity of Ag particles against Colletotrichum gloeosporioides. The applicability of the findings to other fungi or pathogens is not explored. The study also does not investigate the long-term stability or environmental impact of the Ag particles.
1：Experimental Design and Method Selection:
Silver particles were prepared on glass slides using a combined thermal evaporation and laser dewetting process. The size of the particles was controlled by adjusting the thickness of the Ag film and the laser energy applied during the dewetting process.
2：Sample Selection and Data Sources:
Glass substrates were cleaned ultrasonically in deionized water. Silver pellets were vaporized by a resistive heat source to deposit Ag thin films on the glass substrate.
3：List of Experimental Equipment and Materials:
SSI-T500-1 thermal evaporator system, fiber laser (SPI-12, UK, wavelength 1064 nm), optical microscope (OM, HRM-300, Korea), scanning electron microscope (SEM, JSM-7600F, Tokyo, Japan), contact angle measurement system (OCA 15EC, Dataphysics, Germany), surface roughness analyzer (Alpha-Step, KLA D-300, CA, USA).
4：Experimental Procedures and Operational Workflow:
The as-deposited films were dewetted using a fiber laser with repetition rates ranging from 50–500 kHz and irradiation powers in the range of 2–12.5 W. The laser spot size and pulse duration were set as 40 μm and 30 ns, respectively.
5：5 W. The laser spot size and pulse duration were set as 40 μm and 30 ns, respectively.
Data Analysis Methods:
5. Data Analysis Methods: The shape, size, and cross-sectional height of the Ag particles were observed by OM and SEM. The wettability of the different samples was evaluated using a contact angle measurement system. The surface roughness was measured using a surface roughness analyzer.
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