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Topic Area: Nanomaterials

Displaying records 1 to 10 of 152 records.
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1. Cathodoluminescence Quantum Efficiency of Quantum Dot Thin Films
Topic: Nanomaterials
Published: 7/7/2014
Authors: Heayoung Yoon, Christopher Bohn, Youngmin Lee, Seung H. Ko, Jonathan S. Steckel, Seth Coe-Sullivan, Nikolai B Zhitenev
Abstract: A thin film of quantum dots (QD) was used to visualize the local photo-response of polycrystalline CdTe solar cells by down-converting an electron beam of high energy to photons of visible light. The efficient photon generation in the QD film is comp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915669

2. Microsensors for Mars: Trace Analyte Detection in a Simulated Martian Environment
Topic: Nanomaterials
Published: 5/23/2014
Authors: Kurt D Benkstein, Phillip H. Rogers, Christopher B Montgomery, C. Jin, Baranidharan Raman, Stephen Semancik
Abstract: Chemiresistive microsensor arrays are being developed and tested in a simulated Martian environment. Target analyte species include trace small molecules that may indicate current geological or, potentially, biological activity on Mars. The sensi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911107

3. 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

4. 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

5. 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

6. Nanoscale mechanics by tomographic contact resonance atomic force microscopy
Topic: Nanomaterials
Published: 1/23/2014
Authors: Gheorghe Stan, Santiago Solares, Bede Pittenger, Natalia Erina, Chanmin Su
Abstract: We report on a quantifiable depth-dependent contact resonance AFM (CR-AFM) measurements over polystyrene-polypropylene (PS-PP) polymer blends to detail surface and sub-surface features in terms of elastic modulus and mechanical dissipation. The depth ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914282

7. 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

8. 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

9. 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

10. 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



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