Báo cáo hóa học: " Synthesis of long group IV semiconductor nanowires by molecular beam epitaxy" ppt

... Therefore, these Ge NWs are oriented along one of the equivalent <110> directions, in agreement with the Figure 1 Model of group IV semiconductor NW growth by MBE. The NW has a length L and ... lateral growth of the {111} sidewalls, giving rise to a typicalrhombohedralcross- section (Figure 6c). In summary, by combining SEM and TEM analysis of group IV semiconduct...

Ngày tải lên: 21/06/2014, 07:20

... 6:113 http://www.nanoscalereslett.com/content/6/1/113 Page 3 of 7 NANO EXPRESS Open Access Synthesis of long group IV semiconductor nanowires by molecular beam epitaxy Tao Xu 1 , Julien Sulerzycki 1 , Jean ... analysis of the surface energy of diamond cubic crystals. Surf Interface Anal 2003, 35:805. doi:10.1186/1556-276X-6-113 Cite this article as: Xu et al.: Synthe...

Ngày tải lên: 21/06/2014, 05:20

... rates, the M of the nanofibrous structure get lower due to the presence of an abundant amorphous phase which also shows lower coercivity. The relatively large coercivities of nanofibrous structures ... below the Curie temperature of the sample to form magnetic nanofibers. The total magnetization of a nanofiber is given b y the vectorial sum of all single magnetic moments of the...

Ngày tải lên: 21/06/2014, 03:20

... cubic phase of NaYF 4 (JCPDS card, No. 77-2042). From the line broadening of the diffraction peaks, the crystallite size of the sample was determined to be approximately 18 nm using the Debye-Sche ... an important prerequisite for the applications of UCNPs is the availability of small and monodisperse nanoparticles [1]. Recently, the synthesis of various inorganic nanoparticles...

Ngày tải lên: 20/06/2014, 22:20

... properties of existing polymeric membranes are still restricted by the trade-off trend between gas permeability and selectivity which was suggested by Robson [8]. Additional limita- tion of the polymeric ... the development of synthesis methods of pinhole-free, mechanicall y stable, and inorganic-organic hybrid mem- branes to combine the advantages of both inorganic and organi...

Ngày tải lên: 20/06/2014, 23:20

... formation of nanometer scale crystallites of HfO 2 .The second method involved a two-step heating process by which macroscopic, freestanding nanosheets of HfO 2 were formed as a byproduct during the synthesis ... have been reports of interesting p roperties of HfO 2 when synthesized in the form of nanocrystals or nanorods [3-5]. Inducing dimen- sional constraints by reducing...

Ngày tải lên: 21/06/2014, 04:20

... massive amount of synthesis r outes and variations were developed. Most of these were based on the use of catalyst particles, including the che- mical vapour deposition (CVD) route. CVD synthesis ... Germany 3 University of Oxford, Parks Road, Oxford, OX1 3PH, UK 4 West Pomeranian University of Technology, ul. Pulaskiego 10, 70-322 Szczecin, Poland 5 Nanotechnology Center, VSB T...

Ngày tải lên: 21/06/2014, 04:20

... into 200 ml of water and the pro duct wasvacuumdriedat40°Cfor60 h. The yield of azide- functionalized POSS obtained was 85%. Synthesis of MWNT-POSS nanohybrid by click coupling Coupling of an azide ... Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (R11-2005-065). Author details 1 Department of Textile Engineering, Konkuk Uni...

Ngày tải lên: 21/06/2014, 05:20

... precipitation of the oxide. The rate of reaction was controlled by allowing one drop of ammonia per second to react with this solution until a pH of 10, to get a thick dark precipitate. Five grams of citric ... most recommended because of its higher magnetization values, lesser toxicity [19] and the ease of metabolism by the liver. In the present study, we report the synthe...

Ngày tải lên: 21/06/2014, 07:20

... characterization of the Ga 2 O 3 nanowires synthesized in the first step. From Fig. 1a, it can be seen that the diameter of nanowires is about 80–100 nm and the length of nanowires is up to several tens of ... constants of a = 5.80 A ˚ , b = 3.04 A ˚ , c = 12.23 A ˚ , and b = 103.7°. Fig. 1 a FE-SEM image of the Ga 2 O 3 nanowires; b XRD pattern of as-prepared Ga 2 O 3 na...

Ngày tải lên: 21/06/2014, 17:20