NDLI: Rapid Deposition of Gold Nanoparticle Films with Controlled Thickness and Structure by Convective Assembly

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Rapid Deposition of Gold Nanoparticle Films with Controlled Thickness and Structure by Convective Assembly

Content Provider	Semantic Scholar
Abstract	We report how convective assembly at high volume fraction combined with thermal treatment allows robust fabrication of gold nanocoatings whose structure can be varied and correlated to their optical properties and conductance. Uniform films of gold nanoparticles were deposited directly from aqueous suspensions, where neither the nanoparticles, nor the substrates, were covered with ligands or pretreated in any way. The number of layers, optical absorbance, and electrical conductance of these nanocoatings could be controlled by the speed of deposition. The electronic, optical, and structural properties of the nanoparticle multilayers could be further tuned by post-deposition heat treatment. Scanning electron microscopy observations and electrical conductance measurements showed that heating leads to a transition from a near-percolated nanoparticle structure (conductivity approaching 2000 Ω-1cm-1) to a discontinuous insular structure (conductivity <10-5 Ω-1cm-1). These structural transitions change the coating transmission spectra, where the surface plasmon resonance peak could be tuned by heating to any value from 800 to 565 nm. The ability to tune the nanocoating structure and spectral and electronic properties may allow for applications such as nonohmic switching, quantum electronics and sensors.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://crystal.che.ncsu.edu/pdfs/Chem_Mater_gold_nanofilms.pdf
Language	English
Access Restriction	Open
Subject Keyword	3D film Artificial nanoparticles British Informatics Olympiad Chemical vapor deposition Coating Excipient Conductance (graph) Electric Conductivity Electron Microscopy Heating Less Than Ligands Melting Point Metal Nanoparticles Nonlinear system Percolation theory Percolation threshold Physical vapor deposition Radionuclide Imaging Scalability Self-assembly Simulated annealing Staggered tuning Status Epilepticus Surface Plasmon Resonance Suspensions Thickness (graph theory) Vacuum deposition Volume fraction anatomical layer sensor (device)
Content Type	Text
Resource Type	Article

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