Modification of surfaces with nanoparticles using a photo-chemical approachTechnology #m10-009
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Nanoparticles are utilized in electronic as well as biomedical applications for surface modification. However, current techniques lack the spatial resolution and ability to effectively pattern graft nanoparticles to a substrate. This technology uses a chemical compound with varying functional end groups called phthalimides as a photo-initiator for grafting nanoparticles to surfaces. For grafting to soft substrates, phthalimide-functionalized nanoparticles are spin-coated onto a polymeric substrate. For grafting from a hard substrate, phthalimide covers the surface of the substrate in a self-assembled monolayer (SAM), and nanoparticles are spin-coated onto the SAM. In both cases, following spin-coating, UV light exposure crosslinks the nanoparticles to the substrate surface. Photo-masks placed between the nanoparticle-coated surface and UV light source can further vary light intensity reaching the photo-initiators, thus allowing for spatial patterning over the nanoparticle crosslinking area.
Photo-grafting allows for increased control and spatial resolution of nanoparticle substrate coating
The photo-initiators described in this technology can crosslink nanoparticles to a surface depending on light intensity exposure. For this reason, photo-masks, which can be printed with ink to allow more or less light through, permit targeting of specific areas for cross-linked nanoparticles. Spatial resolution allows for improved accuracy and reproducibility in manufacturing surface-modified electronics. Additionally, substrates with grafted nanoparticles can potentially have higher durability and longevity.
Photo-grafting of particles to and from soft and hard substrates, respectively, has been demonstrated using surface analysis of contact angle goniometry, x-ray photoelectron spectroscopy, fluorescence spectroscopy, and scanning electron microscopy.
- Electronic applications including high density digital data storage, touch screens, and photovoltaic applications.
- Biomedical applications including biosensors and drug delivery nanoparticle substrate coatings.
- Controllable spatial resolution of nanoparticle patterning using lithography and photo-masks.
- Controllable thickness of grafted surface.
- Increased durability against scratch, tear, and chemical resistance.
- Can tailor choice of photo-active linkers and nanoparticles for specific use.
Patent Pending (US 20110059264)
Available for licensing and sponsored research support
Tech Ventures Reference: IR M10-009
- EJ Park, T Wagenaar, S Zhang, AJ Link, RK Prudhomme, JT Koberstein, NJ Turro. Using Light to Covalently Immobilize and Pattern Nanoparticles onto Surfaces, Langmuir, Vol. 28, Issue 29, July 2012, pp. 10934-10941.
- EJ Park. Development of Photochemical Surface Modification Technique, Academic Commons Columbia University.
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