metallic nanoparticles nps carbon nanotubes cnts and conducting polymer composites

... nano 2.4 Tổng hợp chức hóa Carbon nanotubes (CNTs) Với trang thiết bị có phòng thí nghiệm lọc hóa dầu – Đại học Bách khoa Đà Nẵng , tổng hợp thành công Carbon nanotubes (CNTs) theo phương pháp kết ... hóa CNTs mô tả hình Quá trình chức hóa CNTs thực vòng 24 CNTs sau chức hóa, ký hiệu CNTs- unct, thu hồi lọc hút chân không rửa nhiều lần nước cất đạt pH trung tính Kết thúc trình này, thu CNTs ... Vật liệu tổ hợp g-nano /CNTs- funct/cotton Kết chụp TEM vật liệu CNTs tổng hợp được trình bày hình cho thấy kích thước ống carbon (CNTs) nằm khoảng 10 – 30nm Hình 5: Ảnh TEM CNTs Trong trình thí...

Ngày tải lên: 22/03/2014, 17:20

... very low carbon solubility and negligible carbide formation Zhou et al [16] argue that low carbon solubility results in an increased precipitation rate To grow carbon nanotubes, Lu and Liu [17] ... of carbon nanotubes produced from phenylboronic acid in a MgO matrix The images show a carbon outer shell and a core (nanowire) comprised B, O and Mg Top image-zero loss image The C, B, O and ... AJ, Hofmann S, Wardle BL: Nanoscale Zirconia as a Nonmetallic Catalyst for Graphitization of Carbon and Growth of Single- and Multiwall Carbon Nanotubes J Am Chem Soc 2009, 131:12144 33 Bystrzejewski...

Ngày tải lên: 21/06/2014, 04:20

... Pt nanoparticles (NPs) immobilized on N-doped carbon nanotubes (CNTs) and undoped ones To understand the bonding of Pt NPs on N-doped and undoped CNTs, the surface scan of XPS spectrum is examined ... mechanism and b Pt NPs immobilized on N-doped CNTs and undoped ones 0.50 0.55 0.60 0.65 0.70 E (V vs SHE) Fig a Electrochemical activity of PtNPs immobilized on N-doped CNTs and undoped ones and bonset ... undoped CNTs, it can be seen that well-dispersed Pt NPs on CNTs can be realized using N doping To further see the deposition of Pt NPs on N-doped and undoped CNTs, one-single N-doped and undoped...

Ngày tải lên: 22/06/2014, 00:20

... beam lithography procedure with standard two-layer resist, and formed by evaporating 15 nm AuPd Devices containing individual metallic DWCNTs with good source and drain contacts were selected ... DWCNTs is like the two level fluctuations or random telegraph signals observed in tunnel junctions, metal-oxide-semiconductor field-effect transistors (MOSFETs), and FETs based on p-type semiconducting ... tunnel junctions, MOSFETs, and FETs based on p-type semiconducting SWCNTs reported previously [23–25] It seems that there are two electronic states in this DWCNT, and the DWCNT can stay stable...

Ngày tải lên: 22/06/2014, 01:20

... single-walled CNTs [17,18], etching [19] and filling [20] of CNTs, magnetic measurements [21,22], purification of CNTs [23] and etc Recent developments and potential applications of CNTs are extensive and ... laser and carbon nanotubes (CNTs) were investigated with a focused laser beam system Phenomena of sustained laser-induced incandescence (LII) and laser-induced actuation were observed and studied ... spectroscopy and characterization of single-walled CNTs The ratio of G-band to D-band intensities can be used as an indicator for the purity of CNTs The lower the D-band compared to the G-band for...

Ngày tải lên: 11/09/2015, 10:05

... nanotubes have also been synthesized and investigated They have shown better H2 storage than carbon nanotubes c) Decoration of carbon nanotubes with metallic nanoparticles and enzymes, for the application ... properties of carbon nanotubes which are relevant to technological applications The outstanding electrical and thermal properties of carbon nanotubes immediately imply that CNTs are ideal candidates ... characterization of carbon nanotubes and lack of understanding fundamental gas-solid interactions of carbon nanotubes and hydrogen molecules (see Chapter 3.4 for theoretical and chapter for experimental...

Ngày tải lên: 12/09/2015, 09:28

... properties of both fullerenes and carbon nanotubes Extreme carbon nanotubes -The observation of the longest carbon nanotubes (18.5 cm long) was reported in 2009 These nanotubes were grown on Si ... inside a multi-walled carbon nanotube -The thinnest freestanding single-walled carbon nanotube is about 4.3 Å in diameter PROPERTIES OF CARBON NANOTUBES Strength and elasticity  CNTs are expected ... walled carbon nanotubes is about terapascal -The modulus of the multi walled carbon nanotubes correlates to the amount of disorder in the carbon nanotube walls -when multi walled carbon nanotubes...

Ngày tải lên: 19/04/2016, 12:47

... network of carbon nanotubes and electroactive polymer The nanostructured polymer film presents very well-defined electroactivity in neutral aqueous medium from the quinone group embedded in the polymer ... based on electropolymerised polypyrrole and carbon nanotubes, using ethidium bromide as redox indicator with high sensitivity, ca 85 pM Very few works were related to label-free and reagentless ... methods combining polymer and carbon nanotubes have also been widely used in reagentless formats (Xu et al., 2004, 2006; Cai et al., 2003) In this paper, we describe a label-free and reagentless...

Ngày tải lên: 02/07/2014, 14:14

... Chemistry and Pharmacological Potential of Fullerenes and Carbon Nanotubes CARBON MATERIALS: CHEMISTRY AND PHYSICS A comprehensive book series which encompasses the complete coverage of carbon materials ... fullerenes and carbon nanotubes (CNTs) play an important role These new allotropic forms of carbon have been discovered in the last two decades, and, since then, they have stimulated the curiosity and ... systems, which include liposomes, emulsions, polymers and microparticles (Lavan et al., 2003; Martin and Kohli, 2003; Allen and Cullis, 2004), carbon nanotubes (CNTs) have recently gained popularity...

Ngày tải lên: 17/02/2014, 05:20

... Chapter Synthesis and Purification of MultiWalled and Single-Walled Carbon Nanotubes M.Yumura Chapter Electron Diffraction and Microscopy of Carbon Nanotubes S Amelinckx, A Lucas and P Lambin ... Structure and Raman Effect of Single-Walled Carbon Nanotubes R Saito, G Dresselhaus and M S Dresselhaus 51 Chapter Behaviour of Single-Walled Carbon Nanotubes in Magnetic Fields H Ajiki and T Ando ... of Multi-Walled and SingleWalled Carbon Nanotubes EELS Study T Hanada, Y Okada and K Yase 29 Chapter Electronic Structure of Single-Walled Carbon Nanotubes K Tanaka, M Okada and Y Huang ...

Ngày tải lên: 05/03/2014, 17:20

... compound), glass- and carbon fibers, ceramic materials, polymers, and activated carbon have been widely used as a catalytic support However, single-walled and multi-walled carbon nanotubes have ... shell and electron trapping by a carbon nanotube core and following reactions where CNT is a carbon nanotube, hVB is a hole in TiO2 valence band, eCB is a electron in TiO2 conduction band, and ... in situ and the yield of the purified nanotubes was approximately 40 % and revealed that 15 % of the surface of the carbon nanotubes was covered with carboxylic (-COOH), carbonyl (-CO) and hydroxylic...

Ngày tải lên: 20/03/2014, 13:06

... 221-230 Conclusion Gold NPs, CoPt and FePt NPs have been prepared After annealing, CoPt and FePt NPs showed a high coercivity We succeeded in conjugating Trastuzumab to gold NPs for specific detection ... would have a film of CoPt The presence of PVP around NPs created a steric forces that limit the growth of NPs and we could obtained Co and Pt NPs well dispersed in the solution 226 N.H Luong et ... went to the cathode surface and received electrons to make Pt and Co NPs If there was not PVP surfactant, Co and Pt atoms would continously deposited on the particles and at the end we would have...

Ngày tải lên: 28/03/2014, 13:20

... nanocomposites consisting of MWCNTs functionalized with PANI (MWCNTs-f-PANI) and noble metal (Au and Ag) nanoparticles Firstly, MWCNTs-f-PANI was prepared For this we modified the carbon nanotubes ... crystallinity of the polymers and composites Fig shows the X-ray diffraction patterns of (a) oxidized MWCNTs, (b) pristine PANI, (c) MWCNTs-f-PANI, (d) MWCNTs-f-PANI/Au, and (e) MWCNTs-fPANI/Ag composites ... MWCNTs, and (b) pristine PANI, (c) MWCNTs-f-PANI, (d) MWCNTs-f-PANI/Au, and (e) MWCNTs-f-PANI/Ag composites Oxidized MWCNTs (Fig 5a) generated a weak peak at 1725 cm−1 , which was due to the carbonyl...

Ngày tải lên: 05/05/2014, 15:26

... in the spectra of CNTs grown under negative and zero dc bias voltage represent sp3 rich phases of CNTs and suggest the existence of amorphous carbon or defects on the walls of CNTs. 31 The absence ... quality of the fit in the low-energy and high-energy tails of the D- and G-bands, respectively, is good The assignment of the peak components of the D- and G-bands is consistent with the works 19730 ... FESEM images of CNTs grown under (e) +100 V and (f) + 200 V of Rao et al.28 and Sun et al.29 The Raman spectra are generally distinguished by two peaks around 1318 and 1595 cm-1 and a shoulder...

Ngày tải lên: 06/05/2014, 08:53

... folding is the metallic and scrniconducting character of single-walled carbon nanotubes While most carbon nanotubes arc semiconductors, a fraction (1 13) are mclallic or quasi -metallic This pcculiar ... infrared and Ramanactivc phonon modcs and showed for armchair and zig-zag tubes the displacement patterns of the Raman-active phonons 3 Electronic Properties of Carbon Nanotubes Carbon nanotubes ... visiblc cncrgy range The bonding and antibonding x band, in contrast, cross at the Fermi lcvcl Thcy make graphene and one third of carbon nanotubes metallic or quasi -metallic This chapter concentrates...

Ngày tải lên: 04/06/2014, 15:05

... of the CNT-Pd sensors suggest a hopeful candidate for noxious gas sensors, especially those for NH3 and CO Abbreviations CNTs: carbon nanotubes; CO: carbon monoxide; NH3: ammonia; Pd: palladium ... limit, and good repeatability over a variety of NH3 and CO concentrations and also showed better repeatability and less noise Moreover, CNT-Pd sensors detected concentrations as low as ppm of NH3 and ... HP: Gas molecule adsorption in carbon nanotubes and nanotube bundles Nanotechnology 2002, 13:195 Zhao Q, Nardelli MB, Lu W, Bernhoc J: Carbon nanotube-metal cluster composites: a new road to chemical...

Ngày tải lên: 20/06/2014, 22:20

... single wall carbon nanotubes Carbon 2002, 40:2043-2061 24 Deng F, Zheng QS, Wang LF: Effects of anisotropy, aspect ratio, and nonstraightness of carbon nanotubes on thermal conductivity of carbon ... 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; nanofluids; ... Science and Innovation (MICINN) under project MAT 2010-18749 MMG thanks the CSIC for a JAE-Pre grant -6- References Han Z, Fina A: Thermal conductivity of carbon nanotubes and their polymer nanocomposites:...

Ngày tải lên: 20/06/2014, 23:20

... conceived and designed this work HY and ZZ performed the MD simulations HY, YZ and ZZ collected and analyzed the data All authors discussed the results and edited the manuscript All authors read and ... nanoflows and is instructive for understanding the coupling effect of the size and the temperature at the nanoscale Abbreviations LJ: Lennard-Jones; MD: molecular dynamics; SWCNTs: single-walled carbon ... Carbon Nanotube Nature 2001, 414:188 Holt JK: Carbon Nanotubes and Nanofluidic Transport Adv Mater 2009, 21:3542 Hanaski I, Yonebayashi T, Kawano S: Molecular dynamics of a water jet from a carbon...

Ngày tải lên: 21/06/2014, 06:20

... image of PECVD-grown CNTs b TEM image of ALD ZnO-coated CNTs c and d SEM images of ALD ZnO-coated CNTs e TEM image of ALD AlxOy-coated CNTs Fig Raman spectrum of CNTs before (a) and after (b) ALD ... our PECVD MWCNTs (Fig curve a) shows a strong D band, indicating the existence of defects on the tube wall Compared to MWCNTs, the surfaces of the single-walled carbon nanotubes (SWCNTs) are known ... *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 a shoulder of the Nanoscale Res...

Ngày tải lên: 21/06/2014, 08:20

... performance of zigzag and chiral carbon nanotubes Xiaojian Tan1, Huijun Liu*1, Yanwei Wen1, Hongyan Lv1, Lu Pan1, Jing Shi*1, and Xinfeng Tang2 Key Laboratory of Artificial Micro- and Nano-structures ... simulations and nonequilibrium Green's function method, we investigate the thermoelectric properties of a series of zigzag and chiral carbon nanotubes which exhibit interesting diameter and chirality ... electron and phonon transports and thus can significantly improve the ZT value As an interesting quasi-one-dimensional nanostructure with many unusual properties, carbon nanotubes [CNTs] have...

Ngày tải lên: 21/06/2014, 17:20