powder amorphous precursors nanotubes and nanowires
Báo cáo hóa học: "Synthesis and Growth Mechanism of Ni Nanotubes and Nanowires" potx
... process of Ni nanowires begins with the formation of Ni nanotubes Nanotubes were formed at first, and then Ni nanoparticles of the electrode stacked randomly in the tubes, until nanowires were ... electrodeposition process for Ni nanotubes and nanowires Figure 4a provides a clear understanding of the growth mechanism of Ni nanotubes The junction between the electrode surface and the bottom edge of ... electrode surface until the nanotubes are completely filled, and nanowires are obtained 123 1018 Nanoscale Res Lett (2009) 4:1015–1020 Fig TEM images of Ni nanowires and nanotubes: (a) sample 1,...
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Synthesis of large scale sic–sio2 nanowires decorated with amorphous carbon nanoparticles and raman and PL properties
... carbon-related bands in Raman spectrum The enhancement of blue emission band and a new yellow band were observed from SiC–SiO2 core–shell nanowires decorated with carbon nanoparticles and considered ... observation D- and G-band were also appeared in spectrum (b) As can be seen in Fig 4, D- and G-band in spectrum (b) are different from those of spectrum (a) in position, width, and intensity ratio ... recorded from different nanowires In Fig 5, spectrum (a) and (b) were recorded from two kinds of nanowires Strong enhancement of blue emission band at about 482 nm (2.58 eV) and appearance of a new...
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Phonon assisted tunneling process in amorphous silicon nanostructures and gaas nanowires
... applied voltage and temperature by analyzing the transition rate W(E,T) of electron/hole from deep center to conduction band and using in this manner dependences on the field strength and on temperature, ... from deep center to the conduction band derived in Ref [5] is used: iln J (A/cm-2) 2860 (3) 8e_ET Here G2 ¼ 8að_oÞ2 ð2n þ 1Þ is the width of the absorption band of a center, n ¼ ½expð_o=kB TÞ ... charge unit, m* is the electron effective mass, and a is the electron–phonon coupling constant ða ¼ G2 =8ð_oÞ2 Þ, where G0 is the width of center band at temperature K Thus, let us compare the...
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titanium oxide nanotubes, nanofibers and nanowires
... 354 and 375 m2 /g being obtained when amorphous TiO2 powders reacted with NaOH (10 mol/L) solution at 100, 130 and 150 ◦ C, respectively Values of 325 and 371 m2 /g obtained when TiOSO4 powder ... were often bent (Figs and 4) The Na+ ions attached in nanotubes and nanosheets could be exchanged and removed after washing with water and diluted acid solution Titanium in the amorphous TiO2 gel ... nanowires were formed in the autoclaving of TiO2 powders and KOH solution The TEM observation of the growth process of the nanowires reveals that nanowires 182 Z.-Y Yuan, B.-L Su / Colloids and...
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hierarchically structured anatase nanotubes and membranes
... utilizing both the (NH4)2TiF6 precursor and boric acid By lengthening the deposition period, nanowires were also obtained The diameters of both nanotubes and nanowires obtained by them corresponded ... bath for 30 and collecting the fragments on holey carbon copper-supported grids Nitrogen adsorption and desorption isotherms were recorded at 77 K using an Accelerated Surface Area and Porosimetry ... open circles – anatase TiO2), and (c) AAO membranes treated by liquid phase deposition for h with Ti/Al ratio of Recently, Shyue and co-workers [18] formed TiO2 nanotubes by coating the walls...
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nanotubes and nanocones
... downloaded at www.jcrystal.com My earliest implementation of routines for the creation and visualization of nanotubes and nanocones was realized in JSV (Java Structure Viewer), a program which I wrote ... generating a flat graphene sheet and then rolling it into a tube or a cone Two types of nanotubes can be capped with parts of the well-known Buckyball (C60) These are the {5,5} and the {9,0} tubes, which ... {7,0}, {10,0}, {13,0} and {16,0} tubes {7,0} Nanotube Bundle A bundle of seven {7,0} single-walled carbon nanotubes (SWCNT) {7,3} Nanotube Bundle A bundle of seven {7,3} nanotubes Inside {5,3}...
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Báo cáo hóa học: " Thermal conductivity of carbon nanotubes and graphene in epoxy nanofluids and nanocomposites" pptx
... conductivity of carbon nanotubes and graphene in epoxy nanofluids and nanocomposites Mario Martin-Gallego1, Raquel Verdejo1, Mohamed Khayet2, Jose Maria Ortiz de Zarate2, Mohamed Essalhi2, and Miguel Angel ... synthesis and characterization of nanofillers and nanocomposites, participated in the discussion, and drafted the manuscript RV helped in nanocomposite preparation, participated in the discussion, and ... vibrational modes of the graphene and of the polymeric matrix plays a dominant role on the thermal conductivities of the liquid and solid states Keywords: carbon nanotubes; graphene; nanocomposites;...
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Báo cáo hóa học: " Atomic Layer Deposition of ZnO on Multi-walled Carbon Nanotubes and Its Use for Synthesis of CNT–ZnO " doc
... those D band, D0 band and G band peaks changed only slightly Additional Raman peaks from the ZnO shells appeared; the relatively strong peaks at 427 and 567 cm-1 correspond to Ehigh and A1 (LO) ... seen, a G band appears at about *1580 cm-1 corresponding to sp2-hybridized carbon and a D band at *1346 cm-1 originating from disordered carbon [17, 18] In addition to the D band, the D0 band as ... distortion [18] The intensity ratio of the D0 over the G band (ID0 /IG) increases with a decrease in the graphite crystalline domain The D band and D0 band peak are very strong, indicating that the CNTs...
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Báo cáo hóa học: "Single step process for the synthesis of carbon nanotubes and metal/alloy-filled multiwalled carbon nanotubes" docx
... development and fabrication of microelectrodes in fuel cell technology and as hydrogen sensors Filling of hydrogen storage alloy nanowires inside CNTs prevents them from oxidation and hence results ... carbon and the methane decomposition rate depend on the structure and nature of the active catalytic sites and the size of the catalyst particles [21], alloy hydride catalysts with low cost and ... for SWNTs show the presence of RBM, at 388.9 cm–1, in addition to the G- and Dbands The increase in the intensity of D-band for Nifilled MWNTs is due to the non-uniform filling of Ni, resulting...
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Nanotubes and Nanofibers potx
... quasi-one-dimensional materials such as nanotubes and nanowires demonstrate many extreme properties that can be tuned by controlling their structure and diameter Nanotubes, nanowires, and nanofibers are not only ... materials and structures incorporating nanotubes and nanowires are under development Extensions to other tubular and rodlike or wirelike structures provide the scope for new discoveries and novel ... pyrolysis of organic precursors [57] TEM-based pulling and bending tests gave more reasonable moduli and strength of MWNT of 0.8 and 150 GPa, respectively [58] Multiwall nanotubes and SWNT bundles...
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Theoretical investigations of sandwich molecular clusters and nanowires, and their surface assembly
... multidecker sandwich complexes and clusters 1.1.1 Multidecker sandwich complexes and clusters containing pure hydrocarbon rings 1.1.2 Multidecker sandwich complexes and clusters containing boron- and ... the multidecker sandwich clusters and the infinite sandwich nanowires that are studied in this thesis 1.2 Theoretical investigations on multidecker sandwich complexes, clusters and SMWs The early ... Sandwich Molecular Wires 54 4.1 Computational details 55 4.2 Vn(SiCp)n+1 and Fen(SiCp)n+1 sandwich molecular clusters 56 4.3 (SiCp-M)∞ sandwich molecular wires 63 4.4 Germacyclopentadienyl sandwich...
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Aluminum oxide template and titanium oxide nanotubes and their applications
... Fabrication and characterization 2.1 Introduction 2.2 23 Preparation of aluminum oxide templates, titanium oxide nanotubes and magnetic nanowires and deposition of thin film 2.2.1 23 2.2.2 Nanowires ... Preparation of aluminum oxide templates, titanium oxide nanotubes and magnetic nanowires and deposition of thin film 2.2.1 Aluminum oxide template and titanium oxide nanotube array via anodization ... and electrolyte and O2− deficit at the interface of barrier layer and aluminum Thus, it can function as a couple of N and P junctions, which rectifies the current like a diode Deposition of nanowires...
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Processing and applications of carbon nanotubes and graphene
... armchair chirality (n = m) has no band gap between the conduction band and the valence band, so it is metallic A SWCNT with n - m = 3q (q is an integer) has a quite small band gap It thus exhibits quasi-metallic ... rad, and the gap between cone and plate was 0.5 mm During measurement, the gels were sandwiched between the cone and plate A periodic shear strain: γ = γ0sin(tω) (9) was applied to the cone, and ... by zinc powder at room temperature 82 6.1 Introduction 82 6.2 Results and discussion 82 6.2.1 GO Reduction with Zn Powder 82 6.2.2 Structure and Properties...
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Carbon nanotubes and branched DNA based nucleic acid assays towards a PCR free detection and quantification of nucleic acids
... turn improves the assay sensitivity, and (III) a single-strand DNA (ssDNA) standard bearing the same sequence and length as of the target gene was created and accurately quantified for use in ... SA-beads and COOH-beads 81 2.2.4.4 Hybridization with TG and NTG .81 2.2.4.5 Hybridization with conventional and CNT-based labels .82 2.2.5 Colorimetric detection 82 2.3 Results and ... carbon nanotubes and biosensors I want to thank A/P Sheu Fwu-Shan (NUS) and A/P Poenar D Puiu (NTU) for their guidances Special thanks to Dr Eishi Igata (NTU) for sharing his insights and experiences...
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The hydrothermal synthesis of zeolites-Precursors, intermediates and reation mechanism
... silica near 200 C This concept was developed and extended in a landmark paper by Chang and Bell [63] 3.7 Chang and Bell and after The work of Chang and Bell [63] was based upon studies of the ... organisation and hence amorphous to X-rays (secondary amorphous phase) However, elements of local order will be present and will impart to the amorphous intermediate some of the chemical and physical ... zeolites A, X and mordenite amorphous by ball milling and then carried out hydrothermal syntheses on the residues to yield zeolites A, P and hydroxysodalite [372] From powder XRD and particle...
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Polymer assisted synthesis of aligned amorphous silicon nanowires and their core shell structures with au nanoparticles
... SiNWs and the metal–SiNWs composite materials, and make the processes more cost-effective bin Yvon T64000), and X-ray photoelectron spectroscopy (XPS, Perkin–Elmer PHI-5702) Experimental Results and ... and an ethereal solvent, tetrahydrofuran (THF), reported in detail elsewhere [14,15] This polymer is composed of a randomly constructed network of tetrahedral hybridized phenylcarbyne units and ... 10 °C/min to 1120 °C, and held at 1120 °C for h After this treatment, the target amorphous SiNWs were obtained The freshly prepared SiNWs were peeled off from Si substrate and dispersed in a solution...
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Preparation and photoluminescence properties of amorphous silica nanowires
... SiO2 nanowires can obtained through XPS The two strong peaks at 103.35 and 532.65 eV as shown in Results and discussion TEM micrography shows the general morphology and dimension of SiONWs The nanowires ... vapor of silicon and silicon monoxide is transported to the catalytic center to form SiO and Si nanowires by VLS mechanism while both silicon and silicon monoxide are all oxidized to amorphous SiO2 ... diraction micrographs (inset) show that the nanowires are amorphous Fig 1(b) indicates the amoeba-shape of the nanowires, with the diameter of about 70 nm and a length up to tens of micrometers Fig...
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Large scale synthesis, characterization and photoluminescence properties of amorphous silica nanowires by thermal evaporation of silicon monoxide
... seen by Park and Yong [13] and Zhang et al [23] was observed This reveals that the nanowires have uniform amorphous structure across the length and diameter EDAX spectra of the nanowires were ... However, the nanowires grown in the present study are amorphous across the diameter instead of crystalline Si core and amorphous SiO2 outer shell structure as confirmed by HRTEM image and SAED pattern ... Ni) was found to be essential 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...
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Photoluminescence and growth mechanism of amorphous silica nanowires by vapor phase transport
... can see that, the nanowires are remarkably clean and smooth Fig 2(b) shows the high-magnification TEM image of a catalyst tip, and Figs 2(c) and (d) are the corresponding SAED and high-resolution ... and surrounded by amorphous silica, indicating that the growth process of amorphous silica nanowires is catalyst-assisted EDX was applied to examine the chemical composition of the as-grown nanowires ... band) and Egreen (green emission band) can be obtained, although the fitting was quite subjective The results are tabulated in Table The red emission band has a relatively constant intensity, and...
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