Photoluminescence and growth mechanism of amorphous silica nanowires by vapor phase transport
Photoluminescence and growth mechanism of amorphous silica nanowires by vapor phase transport
... 218–223 Photoluminescence and growth mechanism of amorphous silica nanowires by vapor phase transport Y. Yang a , B.K. Tay a , X.W. Sun a,Ã , H.M. Fan b , Z.X. Shen c a School of Electrical and Electronic ... Ga and Sn, and transport gases such as O 2 , and H 2 , are often introduced into the reaction. In this paper, we shall report a catalyst- assisted syn...
Ngày tải lên: 16/03/2014, 15:19
Large scale synthesis, characterization and photoluminescence properties of amorphous silica nanowires by thermal evaporation of silicon monoxide
... Large-scale synthesis, characterization and photoluminescence properties of amorphous silica nanowires by thermal evaporation of silicon monoxide Sanjay K. Srivastava a, Ã , P.K. ... for the SiO x nanowires growth and also different from bi-cycle chain-like morphology of silica nanowires observed by Kar and Chaudhuri [14] during carbon-assisted non-catalytic g...
Ngày tải lên: 16/03/2014, 15:18
Direct growth of amorphous silica nanowires by solid state transformation of sio2 films
... integrated optical devices. The VLS and the SLS mechanism have been an act- ing mechanism for the growth of silica nanowires [7,8]. In this work, a novel growth mechanism for a-SiONWs is presented ... structure EELS of the silicon 2p edge from the inner phase reveals the formation of amorphous silica nanowire (Fig. 2c); Carbon 1s edge band form the outside shell sh...
Ngày tải lên: 16/03/2014, 15:04
Preparation and photoluminescence properties of amorphous silica nanowires
... Preparation and photoluminescence properties of amorphous silica nanowires X.C. Wu * , W.H. Song, K.Y. Wang, T. Hu, B. Zhao, Y.P. Sun, J.J. Du Laboratory of Internal Friction and Defects in ... oxidized porous silicon and annealed SiO 2 [15]. The PL spectrum is also dierent from that of oxidized Si nanowires [16]. The growth process of the nanowires can be explain...
Ngày tải lên: 16/03/2014, 15:07
Growth of amorphous silicon nanowires via a solid–liquid–solid mechanism
... the vapor phase. In these two cases, growth of the SiNWs is controlled by the well-known vapor liquid–solid Ž. VLS mechanism, in which the vapor phase plays an important role in the growth of ... in the growth of SiNWs. Because this growth process involves solid–liquid–solid phases, it is called SLS growth which is, in fact, an analogous to the VLS mechanism. The...
Ngày tải lên: 16/03/2014, 15:05
Morphology and growth mechanism study of self assembled silicon nanowires synthesized by thermal evaporation
... Morphology and growth mechanism study of self-assembled silicon nanowires synthesized by thermal evaporation Z. Zhang 1 , X.H. Fan, L. Xu, C.S. Lee, S.T. Lee * Center of Super-Diamond and Advanced ... the continual phase separa- tion and precipitation and results in the formation of SiNWs made of a Si core and a SiO 2 sheath. The one-dimensional growth of SiNWs...
Ngày tải lên: 16/03/2014, 15:06
Amorphous silica nanowires grown by the vapor–solid mechanism
... that the nanowires have amorphous silicon oxide phase by comparing to the standard EELS spectrum for amorphous silica. Figs. 2c and d show HRTEM photographs and SAD patterns of a nanowire and a ... seed silica nanoparticles. This fact implicates that the silica nanowires grow by vapor solid (VS) mechanism, not by vapor liquid–solid (VLS) mechanism. The SiONWs...
Ngày tải lên: 16/03/2014, 15:03
Growth of amorphous silicon nanowires
... silicon nanowires are of an amorphous state and some of nanowires appear to bifurcate in the vertically growth process. The eect of H 2 gas etchings on the catalytic size and the eect of catalytic ... between growth and tail ends of the nanowires. In this Letter, we use chemical vapor deposition of silane to prepare silicon nanowires. Our research group had p...
Ngày tải lên: 16/03/2014, 15:05
A study in the growth mechanism of silicon nanowires with or without metal catalyst
... low-crystal quality of as-received SiNWs even amorphous SiO 2 nanowires. 3.3. Advantage and disadvantage of with and without metal growth The mentioned metal-assisted and free-metal methods are both simple and ... 2007 Abstract The growth mechanism of silicon nanowires synthesized with or without a metal catalyst via chemical -vapor- deposition (CVD) is discussed by...
Ngày tải lên: 16/03/2014, 15:09
Tài liệu Báo cáo Y học: Insights into the reaction mechanism of Escherichia coli agmatinase by site-directed mutagenesis and molecular modelling ppt
... extension, in the case of E. coli agmatinase, of the loop indicated by the letter a. Fig. 5. Scheme of the binuclear manganese cluster and the localization of the side-chains of Asp153 and Asn153 in the ... alignment of B. caldovelox arginase (1cev), E. coli agma- tinase (AUH) and rat liver arginase (1rla). H, S, T and 3 stands for a-helix, strand, turn and 3 10 -helix...
Ngày tải lên: 21/02/2014, 01:21