A wurtz like reaction to silicon nanowires

... SiCl 4 was put into a stainless steel autoclave with 30 ml capacity, and an excess of 20 g metal Na was added. After that, 5 mg of catalyzer precursor was added. The sealed autoclave was maintained at ... the past decades, wurtz- like reactions have been applied to synthesis various inorganic materials. Such as, hexagonal- shaped silicon single crystals [3], multi-wall carbon nanotub...

Ngày tải lên: 16/03/2014, 15:10

... defects after annealing. Raman spectra also con®rmed that the bulk specimen was almost defect-free. By using thermal annealing, defect-free silicon nanowires can be prepared in a simple and practical ... a protective gas and the furnace temperature was increased to 1100°C for 6 h. 1100°C was used as the annealing temperature because nanowires react to become SiO vapor and disapp...

Ngày tải lên: 16/03/2014, 15:03

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Ngày tải lên: 08/02/2014, 09:36

... Proteobacteria, Gammaproteobacteria 1 1 Salmonella enterica ssp. I choloraesuis Proteobacteria, Gammaproteobacteria 0 2 Chromohalobacter salexigens DSM3034 Proteobacteria, Gammaproteobacteria 1 1 Acinetobacter ... Proteobacteria, Alphaproteobacteria 2 0 Ralstonia eutropha H16 Proteobacteria, Betaproteobacteria 2 1 Comamonas testeroni KF-1 Proteobacteria, Betaproteobacteria 2 1 Klebsiella pneu...

Ngày tải lên: 07/03/2014, 00:20

... breathing and that their heart is beating. You may have taken first aid and learned to remember your ABCs: Airway, Breathing, and Circulation. This is a great mnemonic device in a medical sit uation, ... trauma patient is a naked trauma patient.” You can’t fix anything you’re unaware of. I advise undressing your patient entirely (you can always redress them later — as long as you don’...

Ngày tải lên: 14/03/2014, 09:33

... the nanowires as well. The silicon nanowires are interesting to evaluate the quantum confinement effect related to low di- wx mensionality 12 . a- SiNWs grown on substrate have a remarkable surfacervolume ... that the nanowires consist mainly of silicon. A trace amount of oxygen exists in the a- SiNWs, which was attributed to surface oxidation when the freshly made nanow...

Ngày tải lên: 16/03/2014, 15:05

... of the Au nanoclusters may occur, which would also limit the nanowire growth and promote encapsu- lation. EXAFS was used to characterize the cata- lyst, both as a fresh catalysts and after reaction ... °C, and (d) 600 °C. Fig. 4. Si/Ti surface atomic ratio (diamonds) and Si 0 to Si þ4 surface atomic ratio (squares) as calculated from XPS analysis of the Si 2p and Ti 2p lines. N. Sakul...

Ngày tải lên: 16/03/2014, 15:09

... and SiS 2 atoms are quickly flowed away by the protected gas to an area with lower temperature (B in Fig. 4A) . When temperature decreases, the Si atoms are easier to reach saturation in quasi-liquid ... particular, the catalyst distribution can be well-organized by using a nano-channel-alumina (NCA) technique [11]. Otherwise, the pressure of reaction channel and temperature are also...

Ngày tải lên: 16/03/2014, 15:09

... contact with the end surfaces of the wires were obtained by annealing at 250 1C for 20 min. Using the Pd 2 Si contacts as source and drain and the silicon substrate as a back-gate, a transistor ... Sweden Available online 10 August 2007 Abstract For nanowires with Schottky barriers on the end surfaces, charges on the walls of the wire are close enough to the metal–semiconductor inte...

Ngày tải lên: 16/03/2014, 15:14

... growth at an ambient pressure of about 200 Torr. After cooling down to room temperature, a thin layer of gray-colored deposit was found on the surface of the substrate. An Am- ray FEG-1910 scanning ... Hang a , H.F. Yan a ,J.Xu a , Z.H. Xi b , S.Q. Feng a a Department of Physics, Electron Microscopy Laboratory and Mesoscopic Physics National Laboratory, Peking University, Beijing...

Ngày tải lên: 16/03/2014, 15:14