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Topic Area: Nanomaterials
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Displaying records 1 to 10 of 147 records.
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1. Twin Plane Re-entrant Mechanism for Catalytic Nanowire Growth
Topic: Nanomaterials
Published: 3/12/2014
Authors: Andrew D. Gamalski, Peter W. Voorhees, Renu Sharma, Caterina Ducati, Stephan Hofmann
Abstract: We observe a twin plane re-entrant based growth mechanism for Au catalyzed Ge nanowire growth using video-rate lattice-resolved environmental transmission electron microscopy. For a [112] growth direction, we find a convex, V-shaped liquid catalyst ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913029

2. Characterization of InGaN quantum disks in GaN nanowires
Topic: Nanomaterials
Published: 3/4/2014
Authors: Alexana Roshko, Roy Howard Geiss, John B Schlager, Matthew David Brubaker, Kristine A Bertness, Norman A Sanford, Todd E Harvey
Abstract: Catalyst-free GaN nanowires with InGaN quantum disks (QDs) were characterized by scanning/transmission elec-tron microscopy (S/TEM) and photoluminescence. A va-riety of structures, from QDs with large strain fields to apparently strain free QDs were ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914871

3. Laser-assisted atom probe tomography of MBE grown GaN nanowire heterostructures
Topic: Nanomaterials
Published: 2/24/2014
Authors: Norman A Sanford, Paul Timothy Blanchard, Matthew David Brubaker, Kristine A Bertness, John B Schlager, R Kirchofer, David R Diercks, Brian Gorman
Abstract: Laser-assisted atom probe tomography (L-APT) was performed on GaN nanowires (NWs) and axial GaN/InGaN nanowire heterostructures. All samples were grown by MBE on Si(111) substrates. The laser pulse energy (PE) at 355 nm used in L-APT analysis of Ga ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914658

4. Quantitative determination of nanoparticle surface coatings using microscale thermogravimetric analysis
Topic: Nanomaterials
Published: 1/8/2014
Authors: Elisabeth Mansfield, Christopher Michael Poling, Jenifer Lee Blacklock, Katherine M Tyner
Abstract: The use of nanoparticles in some applications (i.e., nanomedical, nanofiltration or nanoelectronic) requires small-scale samples with well-known purities and composition. In addition, when nanoparticles are introduced into complex environments ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914528

5. Atom probe tomography evaporation behavior of C-axis GaN nanowires: Crystallographic, stoichiometric, and detection efficiency aspects
Topic: Nanomaterials
Published: 11/13/2013
Authors: Norman A Sanford, David R Diercks, Brian Gorman, R Kirchofer, Kristine A Bertness, Matthew David Brubaker
Abstract: The field evaporation behavior of c-axis GaN nanowires was explored in two different laser-pulsed atom probe tomography (APT) instruments. Transmission electron microscopy imaging before and after atom probe tomography analysis was used to assist in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915760

6. Controlling Foam Flammability and Mechanical Behavior by Tailoring the Composition of Clay-Based Multilayer Nanocoatings
Topic: Nanomaterials
Published: 9/23/2013
Authors: Yu-Chin Li, Yeon Seok Kim, John R Shields, Rick D Davis
Abstract: This is the most comprehensive evaluation of Layer-by-Layer (LbL) coatings intended to reduce the flammability of polymeric materials. Through a systematic variation of the coating recipe, an ideal combination of the coating attributes was ide ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913643

7. PEGylated Gold Nanorod Separation and Characterization by Asymmetric Field Flow Fractionation Based on Aspect Ratio with UV-Vis Detection
Topic: Nanomaterials
Published: 9/5/2013
Authors: Thao Minh Nguyen, Julien C. Gigault, Vincent A Hackley
Abstract: The development of highly efficient asymmetric-flow field flow fractionation (A4F) methodology for biocompatible PEGylated gold nanorods (GNR) without the need for surfactants in the mobile phase is presented. We report on the potential of A4F for r ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914165

8. Disparate effects of an O2 internal impurity on the elongation and quantum transport of gold and silver nanowires
Topic: Nanomaterials
Published: 8/21/2013
Authors: Shmuel Barzilai, Francesca M Tavazza, Lyle E Levine
Abstract: In this work we investigated the effects of an internal O2 impurity on the conductance of elongated gold and silver nanowires (NWs) using density functional theory (DFT) calculations. We found that the O2 interacts with these metallic NWs very diffe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913786

9. Temperature-Programmed Electrospray-Differential Mobility Analysis for Characterization of Ligated Nanoparticles in Complex Media
Topic: Nanomaterials
Published: 8/12/2013
Authors: De-Hao D. Tsai, Frank W DelRio, John M Pettibone, Pin Ann Lin, Jiaojie Tan, Michael Russel Zachariah, Vincent A Hackley
Abstract: In this study, an electrospray-differential mobility analyzer (ES-DMA) was operated with an aerosol flow-mode, temperature-programmed approach to enhance its ability to characterize the particle size distributions (PSDs) of nanoscale particles (NPs) ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913860

10. Ab initio study of the mechanical and the transport properties of pure and contaminated silver nanowires
Topic: Nanomaterials
Published: 7/12/2013
Authors: Shmuel Barzilai, Francesca M Tavazza, Lyle E Levine
Abstract: The conductance and mechanical properties of pure and contaminated silver nanowires were studied using density functional theory (DFT) calculations. Several nanowires containing O2 on their surface were elongated along two different directions. All o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913340



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