Si and siox nanostructures formed via thermal evaporation

... Processing, Tsinghua University,Beijing 100084, ChinaReceived 18 April 2001; in ®nal form 13 June 2001AbstractVarious Si and SiOxx  1 to 2 nanostructures were formed via a thermal evaporation ... Si and SiOx nanostructures formed via thermal evaporation Yong-jun Chen*, Jian-bao Li, Jin-hui DaiDepartment of Materials Science and Engineering, State Key Laboratory of New Ceramics and ... car-bonated silica ®bers [15], silica nanowire `bundles' and silica `nanobrushes' [16] under dierent con-ditions. In this Letter, some interesting self-as-sembled Si and SiOxnanostructures...

Silicon nanowires grown on si(1 0 0) substrates via thermal reactions with carbon nanoparticles

... theformation of Si nanowires by thermal evaporation of pure SiO [23] or mixed Si SiO2[24] powders.Similarly, in our case a possible reaction routeleading to the nucleation of the Si nanostructures is ... taken collecting the Si 2p photoelectrons corresponding to elemental Si (Si) and SiO2(SiO2)components and C 1s photoelectrons (C). The left and right panels show the raw and processed images, ... $6.5 and 20AA for the ÔsquareÕ and outside areas, using therelationship doxide¼ koxidecosðaÞ ln½1 þðI4þ=I0Þ=c,where I4þ and I0are the integrated intensities ofthe Si and Si oxide...

Characteristics of siox nanowires synthesized via the thermal heating of cu coated si substrates

... considerable efforts havebeen placed on the synthesis and characterization of thosematerials over the past several years.Silicon (Si) and silica (SiOx) nanostructures haveattracted considerable ... visible region.Gaussian ﬁtti ng analysis showed that the broad emissionband was a superimposition of two major peaks at 428 and 469 nm, respectively. The similar blue emission with a peakposition ... locallypresent small islands. On the other hand, the relativelythick Cu layer may not be transformed into the smallenough islands. The formed big islands may provide densenucleation sites, generating...

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

... made of a Si core and a SiO2sheath.The one-dimensional growth of SiNWs is facili-tated by the SiO2sheath that con®nes the lateralgrowth of SiNWs, and the high absorptivity for Si O clusters ... SiNWs deposited on Si at about 1000°C.(a) SiNWs are connected and grown radially outward from thesurface of the particle: and (b) some SiNWs show preferredgrowth directions from dierent sized ... that the nucleation sites ofSiNWs are on the surface of a SiO matrix, wherethe amorphous SiO nanoparticles are formed, and successive phase separation (or disproportiona-tion) and precipitation...

Large scale synthesis, characterization and photoluminescence properties of amorphous silica nanowires by thermal evaporation of silicon monoxide

... crystalline Si embedded in SiO2outer shell wasobserved unlike some earlier reports on growth of Si nanowires bySiO evaporation [23], the concept that SiO ﬁrst disproportionateinto Si and SiO2to ... 2009PACS:61.46.–w81.07.–bKeywords:Silicon monoxideSilicon oxide nanowires Thermal evaporation PhotoluminescenceabstractA single step non-catalytic process based on thermal evaporation of silicon monoxide has ... synthesis of pure silica(SiO2) nanowires by a non-catalytic approach based on thermal evaporation of SiO under argon ambient with traces of oxygen.The process is simple yet elegant and involves...

Synthesis and photoluminescence property of silicon carbon nanowires synthesized by the thermal evaporation method

... high pure and expensive carbon nanotube or thehazardous and easily explosive silicon (carbon) precursor of SiH4or SiCl4(CH4). In addition, the synthesized products were of lowyield and with ... can occur,SiOðgÞþCOðgÞ!SiCðsÞþ2SiO2ðsÞ (9)Since SiC has much higher melting point than SiO2, thesolidiﬁcation of SiC occurs faster than that of SiO2 and theamorphous, viscous SiO2may ... as-synthesized SiC nanowire samples(Fig. 7) also showsb-SiC characteristic absorption band at791 cmÀ1 and SiO2characteristic absorption bands at 470 and 1000 cmÀ1[13,20]. The SiO2characteristic...

Temperature-Controlled Growth of Silicon-Based Nanostructures by Thermal Evaporation of SiO Powders

... metal-containing Si target11-14or metal-free Si/ SiO2target,11,15 and thermal evaporation of Si- SiO2mixture11,16,17or SiO pow-ders.11,18Among these techniques, the thermal evaporation techniquedeveloped ... present study isSiO, we assume that the nucleation of the Si particle occurs onthe Si substrate by decomposition of SiO described by 2SiO ) Si + SiO2. After the Si nucleus is formed, it will ... case also occurs in thepreparation of Si- O powders from a mixture of SiO2 and Si. Hass and Sulzberg21found that the decomposition of SiO vaporinto Si and SiO2should occur above a certain temperature....

Tài liệu Báo cáo khoa học: Association of mammalian sterile twenty kinases, Mst1 and Mst2, with hSalvador via C-terminal coiled-coil domains, leads to its stabilization and phosphorylation doc

... apoptosis. J Biol Chem 277, 47991–48001.11 Lee KK, Ohyama T, Yajima N, Tsubuki S & YoneharaS (2001) MST, a physiological caspase substrate, highlysensitizes apoptosis both upstream and ... promotes apoptosis in conjunction with sal-vador and warts. Cell 114, 445–456.21 Udan RS, Kango-Singh M, Nolo R, Tao C & Halder G(2003) Hippo promotes proliferation arrest and apopto-sis in the ... [6]).Based on their similarity with each other, the Mst kin-ases can be further subdivided into two groups, Mst1 and Mst2 (GCKII) and Mst3 and Mst4 (GCKIII).Mst1 has been widely studied and is the best...

Formation of silicon oxide nanowires directly from au si and pd–au si substrates

... 2006AbstractAmorphous silicon oxide (SiOx) nanowires were directly grown by thermal processing of Si substrates. Au and Pd–Au thin ﬁlms withthicknesses of 3 nm deposited on Si (0 0 1) substrates ... heated Au deposited Si (0 0 1) [Au /Si] and Pd–Au deposited Si (0 0 1) [Pd–Au /Si] substrates in the tube furnace. As shown in Fig. 1(a),Aunanoislands with diameters of 10–80 nm were formed onthe surface ... that our SiOxnanowires grown on the Au /Si substrate have an atomic ratio of Si/ O higher than the12ofSiO2. On the other hand, the atomic ratio of Si/ O in theSiOxnanowires formed on...

Silicon nanowires fabricated by thermal evaporation of silicon monoxide

... SiNWs.20 30 40 50 60 70 8050010001500200025003000SiO2Al2O3 Si ¦Ã-Al2O3Al(220) Si( 331) Si( 400) Si( 311) Si( 220) Si( 111)Intensity2 Theta (degree)Fig. 3. XRD spectrum of the SiNWs ... crystalline silicon nanowires (SiNWs) with a diameter of ∼30 nm and length of tens of micrometers onAl2O3templates and silicon wafers were synthesized by the thermal evaporation of silicon monoxide ... the SiNWs consistsof high-intensity Si and small quantity of oxygen.Fig. 3 shows the XRD spectrum of the SiNWs grownon the Al2O3template, which displays high-intensitypeaks of the Si (1...

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