研究目的
To determine the physical stability and degradation properties of fluoropolymer films under various environmental conditions, including abrasive wear, elevated temperatures, ultraviolet radiation, oxygen plasma, and SF6 plasma.
研究成果
Fluoropolymer films show significant elastic recovery from scratches, stability under certain UV wavelengths and temperatures up to 175°C, but degrade at higher temperatures and under 254 nm UV light. Etching rates vary with plasma type, indicating different removal mechanisms. These findings are relevant for applications in microfabrication and functional coatings.
研究不足
The study is limited to specific environmental conditions and film thicknesses; further investigation is needed for other degradation mechanisms and long-term stability. The use of specific equipment and gases may not generalize to all industrial settings.
1:Experimental Design and Method Selection:
The study involved exposing fluoropolymer films to different environmental conditions to assess degradation. Methods included abrasive wear tests using AFM, exposure to elevated temperatures, UV radiation, and plasma treatments.
2:Sample Selection and Data Sources:
Films were deposited on single crystal N-type Si (100) wafers using PECVD with c-C4F8 gas. Samples were handled with tweezers to avoid contamination.
3:List of Experimental Equipment and Materials:
Equipment included an STS Multiplex ICP DRIE etcher for deposition, UVISEL ellipsometer for thickness measurement, NanoWizard II AFM for topography and wear tests, Escalab 250 XPS system for composition analysis, High Temperature Heated Stage for temperature exposure, UVLS-28 EL Series UV Handheld Lamp for UV exposure, and custom environmental chamber. Materials included c-C4F8 gas, Si wafers, and various gases for plasma treatments.
4:Experimental Procedures and Operational Workflow:
Films were deposited with specific parameters, then subjected to wear tests at different temperatures and loads, temperature cycles, UV exposure at different wavelengths and atmospheres, and plasma exposure. Thickness and topography were measured before and after treatments.
5:Data Analysis Methods:
Thickness was measured using ellipsometry with a four-phase model, topography was analyzed with AFM software, composition was determined by XPS, and wear coefficients were calculated using the Archard equation.
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UVLS-28 EL Series UV Handheld Lamp
UVLS-28 EL Series
Analytik-Jena
Used to expose films to ultraviolet radiation at wavelengths of 254 nm and 365 nm.
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STS Multiplex ICP DRIE etcher
Multiplex ICP DRIE
STS Plc.
Used for plasma-enhanced chemical vapor deposition of fluoropolymer films and for plasma exposure treatments.
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UVISEL ellipsometer
UVISEL
Horiba Jobin-Yvon
Used to measure film thickness over the wavelength range 250-800 nm at an angle of incidence of 70°.
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NanoWizard II AFM
NanoWizard II
JPK Instruments
Used for atomic force microscopy in contact mode to assess film topography and perform abrasive wear tests.
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Escalab 250 XPS system
Escalab 250
Thermo VG Scientific
Used for X-ray photoelectron spectroscopy to analyze film composition.
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High Temperature Heated Stage
HTHS
JPK Instruments
Used for exposing films to elevated temperatures in air.
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Cantilevers
CSC17/noAl
MikroMasch
Used with AFM for contact mode imaging, with a nominal tip diameter of <10 nm.
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Cantilevers
PPP-NCL
Windsor Scientific
Used with AFM for abrasive wear tests, with a nominal tip diameter of 20 nm.
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