PMID-23863931 Stretchable nanoparticle conductors with self-organized conductive pathways.
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- 13nm gold nanoparticles, citrate-stabilized colloidal solution
- Details of fabrication procedure in methods & supp. materials.
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- Films are prepared in water and dried (like paint)
- LBL = layer by layer. layer of polyurethane + layer of gold nanoparticles.
- Order of magnitude higher conductivity than the
- VAF = vacuum assisted floculation.
- Mix Au-citrate nanoparticles + polyurethane and pass through filter paper.
- Peel the flocculant from the filter paper & dry.
- Conductivity of the LBL films ~ 1e4 S/cm -> 1e-6 Ohm*m (pure gold = 2 x 10-8, 50 x better)
- VAF = 1e3 S/cm -> 1e-5 Ohm*m. Still pretty good.
- This equates to a resistance of 1k / mm in a 10um^2 cross-sectional area wire (2um x 5 um, e.g.)
- The material can sustain > 100% strain when thermo-laminated.
- Laminated: 120C at 20 MPa for 1 hour.
- See also: Preparation of highly conductive gold patterns on polyimide via shaking-assisted layer-by-layer deposition of gold nanoparticles
- Patterned via MCP -- microcontact printing(aka rubber-stamping)
- Bulk conductivity of annealed (150C) films near that of pure gold (?)
- No mechanical properties, though; unlcear if these films are more flexible / ductile than evaporated film.
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