| Growth of Vertically Aligned ZnO Nanowire Arrays Using Bilayered Metal Catalysts |
Jan 2012 |
8 pages |
| Authors:
Hua Qi; Evan R Glaser; Josh D Caldwell; S M Prokes; NAVAL RESEARCH LAB WASHINGTON DC ELECTRONICS SCIENCE AND TECHNOLOGY DIV
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 | Vertically aligned, high-density ZnO nanowires (NWs) were grown for the first time on c-plane sapphire using binary alloys of Ni/Au or Cu/Au as the catalyst. The growth was performed under argon gas flow and involved the vapor-liquid-solid (VLS) growth process.We have investigated various ratios of catalyst components for the NWs growth and results indicate that very thin adhesion layers of Ni or Cu deposited prior to the Au layer are ... |
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| Synthesis and Oxidation of Silver Nano-particles |
Jan 2011 |
12 pages |
| Authors:
Hua Qi; D A Alexson; O J Glembocki; S M Prokes; NAVAL RESEARCH LAB WASHINGTON DC ELECTRONICS SCIENCE AND TECHNOLOGY DIV
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| We demonstrated a fast and easy way to synthesize Ag nanoparticles (NPs) on ZnO nanowires (NWs) and silicon substrates by an electroless (EL) plating approach. ZnO NWs used here were grown via vapor-solid (VS) mechanism at 560 oc for 30 min. The stability to oxidation of these EL-produced homogeneous Ag NPs on ZnO nanowires was investigated by surface enhanced Raman spectroscopy (SERS), showing that the attachment ofthiol to the Ag ... |
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| Growth of ZnO nanowires on retroreflector microspheres and the resulting light channeling and plasmonic properties. |
Jan 2011 |
11 pages |
| Authors:
S M Prokes; O J Glembocki; Erin Cleveland; Hua Qi; NAVAL RESEARCH LAB WASHINGTON DC
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| We have investigated the growth of ZnO nanowires on curved BaTi03 retroreflector beads, as well as grov.1h of ZnO nanowires on flat substrates. Results indicate that the growth of ZnO aligned nanowire arrays occurs farther away from the Zn source in the retroreflectors, while the results are opposite for the flat Si substrates. In the case of the ZnO nanowires on flat Si, the nanowires formed in nearly aligned arrays ... |
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| Plasmonic Coupling on Dielectric Nanowire Core-Metal Sheath Composites |
Jan 2010 |
7 pages |
| Authors:
Hua Qi; Dimitri Alexson; Orest Glembocki; S M Prokes; NAVAL RESEARCH LAB WASHINGTON DC ELECTRONICS SCIENCE AND TECHNOLOGY DIV
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| We have developed dielectric core/metal sheath nanowire (NW) composites for surface-enhanced Raman scattering (SERS), in which an electroless (EL) Ag plating approach was employed. The NW surface was uniformly covered with a high density of 3D silver islands having a diameter in the 20-30 nm range and spaced less than approx. 10 nm apart. In comparison with the silver deposition via e-beam evaporation, the EL coating approach has the advantage ... |
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| The Effect of Size and Size Distribution on the Oxidation Kinetics and Plasmonics of Nanoscale Ag Particles |
Jan 2010 |
7 pages |
| Authors:
Hua Qi; Dimitri Alexson; Orest Glembocki; S M Prokes; NAVAL RESEARCH LAB WASHINGTON DC ELECTRONICS SCIENCE AND TECHNOLOGY DIV
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| We employed a simple and effective electroless (EL) plating approach to produce silver nanoparticles (NPs) on bare silicon, on dielectric ZnO nanowires (NWs) and on Si NWs respectively. The surface stability of the homogeneous Ag NPs formed on the ZnO NW surfaces was investigated by surface enhanced Raman spectroscopy (SERS), which show that the attachment of thiol to the Ag surface can slow down the oxidation process, and the SERS ... |
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