nanorods nanowires and nanotubes

semiconductor nanowires and nanotubes

Ngày tải lên : 20/03/2014, 13:07

... only NANOWIRES AND NANOTUBES P1: FHD 105 Figure 13 (a) Thermal conductivities of 58 nm and 83 nm diameter single crystalline Si/SixGe1−x superlattice nanowires The value of x is ∼0.9–0.95 and ... Ghosh, and A.D Stiff-Roberts SYNTHESIS ROUTES FOR LARGE VOLUMES OF NANOPARTICLES, Ombretta Masala and Ram Seshadri SEMICONDUCTOR NANOWIRES AND NANOTUBES, Matt Law, Joshua Goldberger, and Peidong ... saturation as band ﬁlling and charge screening induce an exciton-to-EHP transition GaN nanowires, on the other hand, show a consistent red-shift from threshold to saturation owing to band-gap 27...

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Polymer assisted synthesis of aligned amorphous silicon nanowires and their core shell structures with au nanoparticles

Ngày tải lên : 16/03/2014, 15:06

... 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 ... them upto 300 °C at a rate of °C/ and keeping them at that temperature for h under Ar atmosphere in a seal pyrolysis quartz tube The morphology and structure of nanowires (were examined by scanning...

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composite of tio2 nanowires and nafion as humidity sensor material

Ngày tải lên : 19/03/2014, 16:47

... stability and optical transparency of the composite films The IR spectrum of the hydrated titanium dioxide [h-TiO2 ] shows a large broad band between 3250 and 3490 cm−1 and narrow bands at 1641 and ... TiO2 nanowires SEM pictures revealed that TiO2 nanowires were successfully fabricated by a hydrothermal method in our laboratory Fig 3a and b and other SEM pictures revealed a high yield of nanowires ... TiO2 nanowires with homogeneous morphology and high specific surface area can adsorb moisture easily and R.-J Wu et al / Sensors and Actuators B 115 (2006) 198–204 Fig SEM photograph of TiO2 nanowires/ Nafion...

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facile route to straight sno2 nanowires and their optical properties

Ngày tải lên : 19/03/2014, 16:48

... Alloys and Compounds xxx (2008) xxx–xxx Fig (a) SEM image of the SnO2 nanoparticles synthesized by hydrothermal method (b and c) SEM images of the SnO2 nanowires (d) EDS analysis of the SnO2 nanowires ... indicates that these nanowires are of uniform size and smooth surface, and the average diameter and length of these nanowires are 80 nm and ␮m, respectively The energy dispersive X-ray spectroscopy (EDS) ... single crystalline and grows along [12-1] direction, which is different from common [1 1] and [1 0] growth direction [26,27] No obvious defects and dislocations are observed, and the interplanar...

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syntheses of tio2(b) nanowires and tio2 anatase nanowires by hydrothermal and post-heat treatments

Ngày tải lên : 20/03/2014, 13:08

... images, both diameter and length of nanowires were larger than those of nanotubes; the diameter and length of nanowires were about 10–50 nm and several mm, respectively TEM images and nitrogen adsorption ... 800 and 900 1C, respectively The SEM images of (a) and (b) show almost only nanowires Those of (c) and (d) show both nanowires and small amount of particles Over 800 1C, the surfaces of nanowires ... image and XRD pattern of the titanate nanowires prepared by hydrothermal method at 150 1C for 72 h and H2O wash and subsequent HCl treatment pH2 for times For the following experiments, titanate nanowires...

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Báo cáo hóa học: " Growth and characterization of gold catalyzed SiGe nanowires and alternative metal-catalyzed Si nanowires" pot

Ngày tải lên : 21/06/2014, 05:20

... constant HCl and silane partial pressures (respectively, 160 and 100 mTorr) and fixed deposition time (results not shown) It is observed that NW growth occurs from 600°C, and the length and density ... annealing show that the islands are crystalline PtSi with two main growth directions [101] and [200] After island’s formation, SiH4 in H2 is introduced into the deposition chamber and the growth is studied ... the NW during growth Gold is known to create deep traps in the band gap decreasing the carrier mobility and lifetime in Si and Ge, and be responsible for serious problems of contamination for the...

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Báo cáo hóa học: " Two novel hierarchical homogeneous nanoarchitectures of TiO2 nanorods branched and P25-coated TiO2 nanotube arrays and their photocurrent performances" potx

Ngày tải lên : 21/06/2014, 06:20

... self-organized, and free-standing morphologies, and the optimize geometrical architectures (average external diameter, 350 nm; tube length, 3.5 μm; wall thickness, 10 nm; and space among tubes, 60 nm), and ... rings and attached particles, these special structures and morphologies are the (a) probable cause of crystal nucleus formed And then the nucleus gradually grew up and became increasing TiO2 nanorods ... FESEM images of the top view and cross-section of the TNTAs shown in Figure 1a and the TEM, SAED, and HRTEM images in Figure 1b The second step is the synthesis of BTs and PCTs using hydrothermal...

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Báo cáo hóa học: "Platinum Assisted Vapor–Liquid–Solid Growth of Er–Si Nanowires and Their Optical Prope" potx

Ngày tải lên : 22/06/2014, 00:20

... thermoelectrically cooled InGaAs diode, and the standard lock-in technique The low-temperature measurements were made using a closed-cycle cryostat Results and Discussion Figure 1a, b shows an SEM ... from 80 to 150 nm and lengths of *10 lm, respectively It is known that the epitaxial relationship between the substrate and NWs attributes to the vertical growth of NWs [19] and, thus, both catalysts ... indicates the presence of Er, Si, and O in the surface layer, and a high-resolution TEM image of the surface region shows the presence of a single-crystalline layer sandwiched between nanometer-thin...

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Báo cáo hóa học: " Ultra-fast Microwave Synthesis of ZnO Nanowires and their Dynamic Response Toward Hydrogen Gas" docx

Ngày tải lên : 22/06/2014, 00:20

... ﬁlm was then patterned by photolithography and dry etching About 30 mg of ZnO nanowires dispersed in ethanol and ultrasonicated The suspension (nanowires and ethanol) dropped onto the interdigitated ... Fig a and b Low and high magniﬁcation TEM images of ZnO nanowires, c Corresponding SAED pattern, and d HRTEM 123 952 Nanoscale Res Lett (2009) 4:948–954 Gas Sensing Performance of ZnO Nanowires ... power consumption, fast growth (100 s), and large quantity (in grams) of nanowires The ZnO nanowires have a wurtzite structure and showed a fast response and high sensitivity to hydrogen gas at...

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Báo cáo hóa học: " Tungsten Oxide Nanorods Array and Nanobundle Prepared by Using Chemical Vapor Deposition Technique" potx

Ngày tải lên : 22/06/2014, 18:20

... NSF-EPSCoR and DoD grants We would like to thank Mr William’s assistance of Raman measurements, Mr Ortiz and Ms Hernandez for SEM and EDS measurements, Mr Esteban for XPS measurements and Mr Wu ... bands marked with K1 and K2 located in 770 cm–1 and 870 cm–1 which was shown in Fig 4a, were related to tungsten oxide Typical Raman peaks of crystalline tungsten oxide located at 700 cm–1 and ... than that of 200 and 002 orientations Similar phenomenon was observed at the 2h diffraction angles between 47o and 51o, which were associated with the orientations of 004, 040, and 400 Meanwhile,...

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Báo cáo hóa học: " Gold nanowires and the effect of impurities" doc

Ngày tải lên : 22/06/2014, 22:20

... both a fundamental and applied perspectives, it is a natural line of investigation the understanding of how other atomic and molecular species affect the mechanical, structural and electrical properties ... C, H, O, N, B, and S, and some small molecules; CH, CH2 and H2 We discuss some of them here Hydrogen is an impurity that even under ultra high vacuum conditions might be present and, therefore, ... ab initio DFT methods As mentioned above, both SIESTA and VASP codes were used, and no qualitative changes were observed Breaking distances and breaking forces were all similar within all three...

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Theoretical investigations of sandwich molecular clusters and nanowires, and their surface assembly

Ngày tải lên : 08/09/2015, 19:42

... 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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Synthesis, structure and magnetic properties of nanowires and films by electrodeposition

Ngày tải lên : 14/09/2015, 08:45

... time and length of nanowires Table 4.2: Coercivity Hc and Squareness of Ni nanowires Table 4.3: Coercivity Hc and Squareness of Co nanowires Table 4.4: Coercivity Hc and Squareness of Fe nanowires ... increase our understanding of the growth mechanism of single-crystal and poly-crystal nanowires, and the coercivity mechanism of nanowires and continuous films The investigations and results are ... crystal nanowires The formation of single crystalline structure is due to the stress between AAO pore wall and nanowires formed during nanowires growth.The single-crystalline Ni, Co, and Fe nanowires...

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First principles studies on the interactions between transition metal atoms, si(001), and nanotubes

Ngày tải lên : 14/09/2015, 11:15

... electronic and magnetic properties of these functionalized nanotubes It was found that the magnetism of the encapsulated nanowires is weakened by the interactions between nanowires and nanotubes BC3 nanotubes ... electronic, and magnetic properties of Mn-doped graphitic B2 O sheets and B2 O nanotubes A comparative study on Bx Cy Nz nanotubes ﬁlled by transition-metal nanowires was performed to understand the ... [29] Thus, the understanding of the interactions of TM atoms with nanotubes is very important On one hand, it is important to understand the growth mechanism of nanotubes and the roles played...

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Bottom up 1 d nanowires and their applications

Ngày tải lên : 02/10/2015, 12:55

... 1.3.2.5.2 Diameters of Nanowires VSS is capable of producing long and straight nanowires, but these nanowires are generally in cone shapes [115-117] On the other hand, nanowires in uniform diameters ... Bottom-up 1-D Nanowires and Their Applications Abstract One-dimensional semiconductor and metallic nanowires are of great interest for study due to their fascinating properties and size when ... process with SiH4 and N2 gases at (a) at 575 °C, and (b) 600 °C Fig 2.13 TEM results of nanowires stem grown at 575 °C with SiH4 and 49 N2 gases: (a) a stem (insert: EDS result), and (b) another...

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PREPARATION OF HYBRID TRANSPARENT ELECTRODES OF SILVER NANOWIRES AND CHEMICALLY CONVERTED GRAPHENE ON ABITRARY SUBSTRATE AT LOW TEMPERATURE

Ngày tải lên : 23/09/2016, 14:02

... of Science and Technology 50 (1B) (2012) 425-431 [4] David S Hecht, Liangbing Huand Glen Irvin, Emerging transparent electrodes based on thin films of Carbon nanotubes, Graphene, and metallic ... transmittance of Ag NWs, CCG and hybrid CCG/Ag NWs electrode Figure Transmittance of the AgNWs, CCG and the hybrid CCG/Ag NWs electrode without including the substrate In Fig and Fig 6, the optoelectronic ... σDC/σOp between Ag NWs and graphene/Ag NWs electrode CONCLUSION In this work, we report an inexpensive, fast and facile method for fabricate a flexible hybrid electrode from silver nanowires (Ag NWs)...

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thermal oxide synthesis and characterization of fe3o4 nanorods and fe2o3 nanowires

Ngày tải lên : 20/03/2014, 13:11

... the sample, and the results can be seen in Figure 4(d) It can be clearly identified that the nanorods were composed of Fe and O elements, and the ratio of the number of atoms Fe and O was about ... Fe3O4 nanorods In a typical experiment, a sheet of iron with size of 1×1 cm was polished by the sand paper and dealt with alcohol in ultrasonic for 15 Then, it was placed in quartz boat and a ... Figure 1(a), (c)－(f) and the side SEM image was shown in Figure 1(b) As seen in Figure 1(c) and (e), the shape of nanorods samples were the appearance of rectangular cross-section and with the length...

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titanium oxide nanotubes, nanofibers and nanowires

Ngày tải lên : 20/03/2014, 13:11

... tubes with multiple shells of 1–5 layers, and a shell spacing is about 0.78 nm The tubes are hollow and Results and discussion 3.1 Nanotubes Titanium oxide nanotubes can be formed in the range of ... absorption bands centered at 3400, 1630 and 950 cm−1 can be assigned to O–H stretching mode for interlayer water, oxonium ions and hydroxyl groups, H–O–H bending for water and oxonium ions, and O–H ... these nanosheets 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...

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Báo cáo hóa học: "Synthesis and Growth Mechanism of Ni Nanotubes and Nanowires" potx

Ngày tải lên : 21/06/2014, 20:20

... 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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Tài liệu Medicinal Chemistry and Pharmacological Potential of Fullerenes and Carbon Nanotubes docx

Ngày tải lên : 17/02/2014, 05:20

... Tsang and co-workers studied the interaction of protein, enzymes and DNA with carbon nanotubes They found that DNA molecules tended to cover the surface of nanotubes and the small proteins and ... fullerene and light, so the polymer was tested on mice affected by bone tumor After injection and irradiation, tumor size and weight were reduced and the mouse survival time was extended (Jiang and ... acids and their impact on health 2.2 2.2.1 Carbon Nanotubes Structure and Characteristics CNTs, discovered in 1991 by Iijima (Iijima, 1991; Iijima and Ichihashi, 1993), display unique structures and...

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