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. Yanga, B.K. Taya, X.W. Suna,Ã, H.M. Fanb, Z.X. ShencaSchool of Electrical and Electronic ... Ga and Sn, and transport gases such as O2, and H2, are often introducedinto the reaction. In this paper, we shall report a catalyst-assisted synthesis of amorphous silica nanowires by vapor phase ... 2(b), and 60.28 at% of O, 39.40 at% of Si,0.32 at% of V, and no Zn or Cl, for the long nanowires inFig. 1(b). Thus, it is conﬁrmed that, V acted as a catalyst inthe growth of silica nanowires; ...

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 monoxideSanjay K. Srivastavaa,Ã, P.K. ... for the SiOx 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 growth. It is ... diffusion of Si/SiOxvapors into the metalparticles, (ii) formation of liquid droplet of metal and Si/SiOx and (iii) the precipitation in the form of solid nanowires aftersuper-saturation of liquid...

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-SiONWsis presented ... structureEELS of the silicon 2p edge from the inner phase revealsthe formation of amorphous silica nanowire (Fig. 2c);Carbon 1s edge band form the outside shell shows an amorphous carbon phase (Fig. ... titanium and nitrogen were detected by the EELS in the nanowires. The carbon on the shell is supplied by thermal decom-position of CH4 by nickel. No carbon shells were ob-served from the silica nanowires...

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. DuLaboratory of Internal Friction and Defects in ... oxidized porous silicon and annealed SiO2[15]. The PL spectrum is alsodierent from that of oxidized Si nanowires [16].The growth process of the nanowires can beexplained by the vapor liquid±solid ... of the nanowires at a diameter of 60±110 nm and a length up to hundreds micrometers. Besides most smooth-surface polyp-shaped nanowires, two other forms of nanowires, named amoeba-shaped and frog-egg-shaped...

Growth of amorphous silicon nanowires via a solid–liquid–solid mechanism

... the vapor phase. In these two cases, growth of the SiNWs iscontrolled by the well-known vapor liquid–solidŽ.VLS mechanism, in which the vapor phase playsan important role in the growth of ... in the growth of SiNWs. Becausethis growth process involves solid–liquid–solidphases, it is called SLS growth which is, in fact, ananalogous to the VLS mechanism. The growth pro-cess of a-SiNWs ... consists of nanoparticles of a fewFig. 2. Schematic depiction of SiNW growth by the SLS mecha-Ž. Ž .nism: a deposition of a thin layer of Ni on the Si 111 substrate;Ž. Ž.b formation of the...

Morphology and growth mechanism study of self assembled silicon nanowires synthesized by thermal evaporation

... Morphology and growth mechanism study of self-assembledsilicon nanowires synthesized by thermal evaporationZ. Zhang1, 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 SiO2sheath.The one-dimensional growth of SiNWs is facili-tated by the SiO2sheath ... study of SiNW growth history related to themorphology and growth temperature. We showthat the formation of SiNWs is indeed closely re-lated to the amorphous SiO particles, and the growth and...

Amorphous silica nanowires grown by the vapor–solid mechanism

... that the nanowires have amorphous siliconoxide phase by comparing to the standard EELSspectrum for amorphous silica. Figs. 2c and dshow HRTEM photographs and SAD patterns of a nanowire and a ... seed silica nanoparticles. Thisfact implicates that the silica nanowires grow by vapor solid (VS) mechanism, not by vapor liquid–solid (VLS) mechanism. The SiONWs showstrong blue emission, and ... photograph of the amorphous nanowires. (b) EELS spectrum from the amorphous nanowire. The proﬁle resembles that of the standard EELS spectrum of amorphous silica. (c) A HRTEM photograph and a SAD...

Growth of amorphous silicon nanowires

... silicon nanowires are of an amorphous state and some of nanowires appear to bifurcate in the vertically growth process. Theeect of H2gas etchings on the catalytic size and the eect of catalytic ... between growth and tail ends of the nanowires. In thisLetter, we use chemical vapor deposition of silaneto prepare silicon nanowires. Our research grouphad previously reported the growth amorphous silicon ... of the nanowires is 30 nm. The alignment of the nanowires is improved.Compared with our previously work [17], wegot amorphous aligned silicon nanowires instead of the randomly distributed nanowires. ...

A study in the growth mechanism of silicon nanowires with or without metal catalyst

... low-crystalquality of as-received SiNWs even amorphous SiO2 nanowires. 3.3. Advantage and disadvantage of with and without metal growth The mentioned metal-assisted and free-metal methods are both simple and ... 2007AbstractThe growth mechanism of silicon nanowires synthesized with or without a metal catalyst via chemical -vapor- deposition (CVD) is discussed by using a developed vapor liquid–solid and novel ... absorption of vapor- phase silicon atoms. The continuous absorption induces the supersat-uration of the formed liquid alloy with silicon atoms, which leads tonucleation and growth of a SiNW...

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. coliagmatinase, 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 310-helix. Conserved residues are marked by an ... corrected by hand. Since the sequences of the two arginases and agmatinase greately differ in the N terminal region, theagmatinase and rat liver arginases were stripped of the ﬁrst32 and ﬁve...

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