研究目的
Investigating the use of plasma oxidation and surface patterning for controlling the release of silver ions from a silver-based nanocoating to impart multi-functionality and enhance long-term stability effectiveness in antibacterial applications.
研究成果
Plasma oxidation and surface patterning effectively controlled silver ion release from silver-based coatings, with increased release observed with oxygen incorporation and patterned surfaces showing controlled release without complete exhaustion. These approaches enhance multi-functionality and long-term stability, but further antibacterial testing is required for practical applications.
研究不足
The study did not include antibacterial tests to assess the effect on specific bacteria like E. coli and S. aureus, which are necessary for full validation. Additionally, long-term stability beyond 168 hours was not evaluated, and the scalability of plasma processes for industrial applications may pose challenges.
1：Experimental Design and Method Selection:
The study employed plasma surface engineering techniques, including plasma-enhanced chemical vapor deposition (PECVD) for Ag-DLC coatings, plasma oxidation (post-oxidation and reactive sputtering), and surface patterning via photolithography and sputtering. The rationale was to control silver ion release kinetics through surface modifications.
2：Sample Selection and Data Sources:
Silicon substrates (10 mm x 10 mm) were used. Samples were cleaned ultrasonically with acetone, deionized water, and methanol before plasma treatments.
3：List of Experimental Equipment and Materials:
Equipment includes a PECVD hybrid reactor (FLARION system, Plasmionique), sputtering/ion source hybrid deposition system (Plasmionique HSPT520), XPS (Physical Electronics PHI 5600-ci), AFM (Veeco Dimension TM3100), optical profilometer (Wyko NT9100), and MIP-AES (4200 MIP-AES, Agilent Technologies). Materials include silicon substrates, gases (Ar, H2, CH4, O2), silver target (99.99%), and photoresist for patterning.
4：99%), and photoresist for patterning.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: For Ag-DLC, a one-step process with Ar etching, H2 activation, and CH4 deposition with Ag sputtering. Plasma oxidation involved post-oxidation or reactive sputtering with O2. Surface patterning used photolithography followed by Ag sputtering. Surface characterization (XPS, AFM, optical profilometry) and silver release measurements in deionized water over 168 hours were performed.
5：Surface patterning used photolithography followed by Ag sputtering. Surface characterization (XPS, AFM, optical profilometry) and silver release measurements in deionized water over 168 hours were performed.
Data Analysis Methods:
5. Data Analysis Methods: XPS for chemical composition, AFM for morphology and roughness, optical profilometry for 3D surface metrology, and MIP-AES for silver ion concentration analysis. Statistical analysis included averaging over multiple samples and positions.
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