Technique for Precise, Scalable, and Pristine Patterning of Nanoparticles MIT ScienceMagazine nanoparticle printing nano nanoparticles
Study: Nanoparticle contact printing with interfacial engineering for deterministic integration into functional structures. Image Credit: Anna Kireieva/Shutterstock.com
Nanoparticle contact printing for precise, scalable, and pristine particle patterning. Schematic of the printing process: Nanoparticles are positioned onto a PDMS topographical template using capillary assembly, followed by their dry contact transfer onto a receiving substrate. Dark-field image of a representative 50 × 50 array of ~55-nm gold nanocubes assembled onto a PDMS template. Dark-field image of the same nanocube array after contact transfer onto a silicon substrate.
Nevertheless, these techniques are incongruent with arbitrary systems and frequently lack high-throughput processing because they rely on specific particle characteristics and surface treatments. Moreover, when nanoparticles are in liquid, capillary forces dominate, and van der Waals forces dominate at the interface between the nanoparticles and the solid surface with which they come into contact.
Here, the capillary forces, which were unaffected by the particle type, immobilized the nanoparticles into spatially defined target sites. Although capillary assembly promoted the positioning of various materials, it did not facilitate their facile integration into operational systems. The subsequent transfer of the nanoparticles was driven by their interfacial interactions with the target. However, owing to the lack of conformal contact and nanoscale dimensions, the adhesive interactions between individual nanoparticles are insufficiently small, resulting in low and uncertain transfer yields.
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