研究目的
To enhance the electrical conductivity of nonconductor fabric substrates for flexible wearable devices by constructing a sandwich micro-structure coating layer with silver nanoparticles and investigating the underlying 'silver colloid effect'.
研究成果
The PU/Ag/PU sandwich micro-structure significantly enhances electrical conductivity by six orders of magnitude due to the 'silver colloid effect', involving rearrangement of nanoparticles and quantum tunnelling. This provides a strategy for low-concentration silver conductive fabrics, with implications for future research on optimizing and applying this effect.
研究不足
The study may be limited by the specific materials and concentrations used; potential optimizations could include varying other parameters or testing on different fabric types. The 'silver colloid effect' explanation is theoretical and may require further validation.
1：Experimental Design and Method Selection:
A three-step method was used to assemble the PU/Ag/PU sandwich micro-structure on PET fabric, involving spraying polyurethane, in-situ chemical synthesis of silver nanoparticles, and spraying another polyurethane layer. The design rationale is based on creating a conductive path with low silver content.
2：Sample Selection and Data Sources:
Commercial polyester fabric (100% plain woven) was used as the substrate. Silver nitrate, L-ascorbic acid, polyvinylpyrrolidone, and water-soluble polyurethane were sourced from specified suppliers.
3：List of Experimental Equipment and Materials:
Equipment includes a spraying device (parameters: pressure 0.5 MP, fluid flux 0.5 mL/cm2, time 5 s), ZEISSEVO18 SEM microscope (operating at 3.0 kV, work distance 8.0 mm), and RTS-8 four-point probe for conductivity measurement. Materials include polyester fabric, silver nitrate, L-ascorbic acid, PVP, and WPU.
4：5 MP, fluid flux 5 mL/cm2, time 5 s), ZEISSEVO18 SEM microscope (operating at 0 kV, work distance 0 mm), and RTS-8 four-point probe for conductivity measurement. Materials include polyester fabric, silver nitrate, L-ascorbic acid, PVP, and WPU.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Step 1: Spray WPU onto PET to form PU@PET. Step 2: Transfer PU@PET into AgNO3/PVP solution, add L-AA to reduce Ag+ to Ag0, deposit AgNPs to form Ag/PU@PET. Step 3: Spray another WPU layer to form PU/Ag/PU@PET. Different concentrations of AgNO3 were tested as per Table
5：Data Analysis Methods:
SEM was used for morphology analysis. Electrical conductivity was measured using the four-point probe technique according to AATCC Test Method 76-2005.
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