Modification of SiO2 nanowires with metallic nanocrystals from supercritical CO2.
Through hydrogen reduction of metal precursors in supercritical CO2, Cu, and Pd, nanocrystals were deposited onto SiO2 nanowires to form different types of nanostructured materials, including nanocrystal-nanowire, spherical aggregation-nanowire, shell-nanowire composites, and "mesoporous" metals supported by the framework of nanowires. This supercritical fluid deposition technique is an attractive approach for modifying nanowires because of its generality and simplicity; the modified nanowires could be useful as catalysts and for further fabrication of multifunctional composites.
Ye
Xiang-Rong
XR
Department of Chemistry, University of Idaho, Moscow, Idaho 83844-2343, USA.
Zhang
Hai-Feng
HF
Lin
Yuehe
Y
Wang
Lai-Sheng
LS
Wai
Chien M
CM
D002245:Carbon Dioxide / Q000737:chemistry; D025924:Chromatography, Supercritical Fluid / Q000379:methods*; D003300:Copper / Q000737:chemistry; D003460:Crystallization / Q000379:methods*; D004559:Electric Wiring; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D008422:Materials Testing / Q000379:methods; D008670:Metals / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010165:Palladium / Q000737:chemistry; D011312:Pressure; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry* / Q000302:isolation & purification
D008670:Metals; D002245:Carbon Dioxide; D010165:Palladium; D012822:Silicon Dioxide; D003300:Copper