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Topic Area: Nanomaterials
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Displaying records 31 to 40 of 127 records.
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31. Direct observation of nucleation and early stages of growth of GaN nanowires
Topic: Nanomaterials
Published: 2/15/2012
Authors: Rosa E. Diaz, Renu Sharma, Karalee Jarvis, Qinglei Zhang, Subhash Mahajan
Abstract: We report for the first time direct observations of the nucleation and early stages of growth of GaN nanowires. The nanowires were formed by exposing Au + Ga droplets to ammonia. The formation process was observed in situ, and controlled in real time ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906318

32. Directed 2D-to-3D pattern transfer method for controlled fabrication of topologically complex three- dimensional nanostructures in silicon
Topic: Nanomaterials
Published: 2/1/2011
Authors: Konrad Rykaczewski, Owen J. Hildreth, Ching P. Wong, Andrei G. Fedorov, John Henry Scott
Abstract: A process allowing for control over the 3D motion of catalyst nanostructures during Metal-assisted Chemical Etching by their local pinning prior to etching is developed. Topologically complex 3D structures that are partially located within the et ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906590

33. Discriminating the states of matter in metallic nanoparticle transformations: What are we missing?
Topic: Nanomaterials
Published: 2/20/2013
Authors: John M. Pettibone, Julien Claude Maurice Gigault, Vincent A Hackley
Abstract: A limiting factor in assessing the risk of current and emerging nanomaterials in biological and environmental systems is the ability to accurately detect and characterize their size, shape and composition in broad distributions and complex media. Asy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913009

34. Does Shape Matter? Bioeffects of Gold Nanomaterials in a Human Skin Cell Model
Topic: Nanomaterials
Published: 1/13/2012
Authors: Nicole M Schaeublin, Laura K Braydich-Stolle, Elizabeth I Maurer, Kyoungweon Park, Robert I MacCuspie, A R M Nabiul Afrooz, Navid B Saleh, R.A. Vaia, Saber Hussain
Abstract: Gold nanomaterials (AuNMs) have distinctive electronic and optical properties, making them ideal candidates for biological, medical, and defense applications. Therefore, it is imperative to evaluate the potential biological impact of AuNMs before em ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909150

35. Dynamic light scattering investigations of nanoparticle aggregation following a light-induced pH jump
Topic: Nanomaterials
Published: 5/19/2010
Authors: Ryan Murphy, Denis Pristinski, Kalman D Migler, Jack F Douglas, Vivek M Prabhu
Abstract: We use dynamic light scattering to characterize the kinetics of nanoparticle aggregation. The aggregation process was conveniently initiated in photoacid generator (PAG) solutions where changes in the pH of the solution can be controlled by exposure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904974

36. Effect of AlN Buffer Layer Properties on the Morphology and Polarity of GaN Nanowires Grown by Molecular Beam Epitaxy
Topic: Nanomaterials
Published: 9/8/2011
Authors: Matthew David Brubaker, Kristine A Bertness, Norman A Sanford, Albert Davydov, Igor Levin, Devin M. Rourke, Victor M. Bright
Abstract: Low temperature AlN buffer layers grown by plasma-assisted Molecular Beam Epitaxy (MBE) on Si (111) were found to significantly affect the subsequent growth morphology of GaN nanowires. The AlN buffer layers exhibited nanowire-like columnar protrusi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908715

37. Effect of Self-Assembled Monolayer Film Order on Nanofriction
Topic: Nanomaterials
Published: 7/6/2006
Authors: S Sambasivan, S Hsieh, Daniel A Fischer, Stephen M. Hsu
Abstract: Friction at the nanoscale has become a significant challenge for microsystems, including MEMS, NEMS and other devices. At nanoscale, lateral loading often causes component breakage and loss of functions in devices, therefore, accurate measurement and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851049

38. Effect of elastic deformation on frictional properties of few-layer graphene
Topic: Nanomaterials
Published: 1/9/2012
Authors: Alexander Y. Smolyanitsky, Jason Philip Killgore, Vinod K Tewary
Abstract: We describe the results of Brownian dynamics (BD) simulations of an AFM tip scanned on locally suspended few-layer graphene. The effects of surface compliance and sample relaxation are directly related to the observed friction force. We demonstrate t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909404

39. Effect of oxidation on surface-enhanced Raman scattering activity of silver nanoparticles: a quantitative correlation
Topic: Nanomaterials
Published: 6/6/2011
Authors: Yun Han, Robert Lupitskyy, Tseng-Ming Chou, Christopher M Stafford, Henry Du, Svetlana Sukhishvili
Abstract: The effect of silver oxidation on surface-enhanced Raman scattering (SERS) was investigated using citrate-reduced silver nanoparticles (Ag NPs) (45-50 nm in diameter) immobilized on glass substrate. Oxidation of Ag NPs was performed in controlled ozo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906745

40. Effects of Ligand Monolayers on Catalytic Nickel Nanoparticles for Synthesizing Vertically Aligned Carbon Nanofibers
Topic: Nanomaterials
Published: 3/16/2011
Authors: Kate L Klein, Mehmet Sarac, Robert Wilson, Aaron C. Johnston-Peck, Junwei Wang, Ryan Pearce, Anatoli V. Melechko, Joseph B. Tracy
Abstract: Vertically aligned carbon nanofibers (VACNFs) were synthesized using ligand-stabilized Ni nanoparticle (NP) catalysts and plasma-enhanced chemical vapor deposition. Using chemically-synthesized Ni NPs enables facile preparation of VACNF arrays with m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908045