carbon nanotube based composites and damage sensing

... Nanocomposites 73 Ni -Based Nanocomposites 73 Co -Based Nanocomposites 76 Fe -Based Nanocomposites 77 References 80 3.1 3.1.1 3.2 3.2.1 3.2.2 3.3 Physical Properties of Carbon Nanotube Metal Nanocomposites ... of Carbon Nanotube Metal Nanocomposites 103 Strengthening Mechanism 103 Tensile Deformation Behavior 106 Aluminum -Based Nanocomposites 106 Magnesium -Based Nanocomposites 110 Copper -Based Nanocomposites ... properties and application of carbon nanotube- reinforced composites The various synthetic and fabrication techniques, dispersion of carbon nanotubes in composite matrices, morphological and interfacial...

Ngày tải lên: 04/06/2014, 15:04

... characteristic of single wall carbon nanotube 1.2 Carbon nanotube and metal contact 1.2.1 Atomic structure of carbon nanotube and metal contacts 1.2.1.1 Carbon nanotube and metal contact with ... between metals and carbon nanotube contacts 1.3 Carbon Nanotube based devices 12 1.3.1 Carbon nanotube field effect transistors (CNTFET) 13 iii 1.3.1.1 p-type carbon nanotube field ... Schottky and Ohmic metal and CNT contacts have important applications for CNT based devices and would be the objectives of this dissertation 1.3 Carbon Nanotube based devices Carbon nanotube based...

Ngày tải lên: 10/09/2015, 15:52

... 2.3 Carbon nanotubes (CNTs) 2.3.1 Carbon nanotube structure CNTs are thin, hollow cylinders of covalently bonded carbon atoms They fall into two different categories: single-walled carbon nanotubes ... yield and fast production rate of HiPco process 2.3.3 Electrical properties of carbon nanotubes Carbon nanotubes inherit their remarkable electrical properties from the unique electronic band structure ... DEPOSITION 16 2.3.2.4 HIGH PRESSURE CARBON MONO-OXIDE PROCESS 17 2.3.3 ELECTRICAL PROPERTIES OF CARBON NANOTUBES 17 2.3.4 MECHANICAL PROPERTIES OF CARBON NANOTUBES 20 2.3.5 PREVIOUS WORK ON CNT...

Ngày tải lên: 06/10/2015, 20:43

... : a¼ 2 and C1, C2, C3,…C8 are constants Substituting Eqs 12 and 13 into Eqs 5, 6, 7, 8, 9, 10 and 11, we can obtain the following matrix form: ½ AŠ f C g ¼ Fig A cantilevered nanotube- based mass ... shift and sensitivity of carbonnanotube -based sensor with an attached mass was studied using nonlocal elasticity theory The relationship equation between the frequency shift of the sensor and the ... O’Connell (ed.), Carbon Nanotubes: Properties and Applications (CRC Press, Boca Raton, 2006) M Yudasaka, S Iijima, V.H Crespi, Topics Appl Phys 111, 605 (2008) A.P Ottenhouse (ed.), Carbon Nanotubes:...

Ngày tải lên: 21/06/2014, 07:20

... SWCNT bandgap and can be enhanced by selecting a semiconducting SWCNT with smaller diameter and large bandgap In our previous work [15, 17], we obtained devices with low contact resistance and large ... during the first hour, the ON and OFF states remain well separated and the retention time exceeds 8–10 h in ambient air and under vacuum at both room temperature and 77 K At low temperature, the ... M.J Biercuk, S Ilani, C.M Marcus, P.L McEuen, Electrical transport in single-wall carbon nanotube, in Carbon Nanotubes, Topics Appl Phys, vol 111, ed by A Jorio, G Dresselhaus, M.S Dresselhaus...

Ngày tải lên: 21/06/2014, 08:20

... Pt catalysts on carbon support In the following sections, an overview of supported Pt catalysts will be given including Pt catalysts supported on carbon black (CB) and carbon nanotube (CNT) as ... where the carbon black is replaced by carbon nanotubes during Pt deposition Table 1.1 lists some examples of chemical synthesis methods and sputter-deposition method used to prepare Pt/CNT -based ... other hand, the sulphonic acid group HSO3 is highly hydrophilic and is ionically bonded with a SO3- ion and a H+ ion This is why such structure is called ionomer When the PEM absorbs water and becomes...

Ngày tải lên: 11/09/2015, 10:02

... including carbon paper Teflonization, GDL preparation and CL preparation 43 Carbon Paper Teflonization To fabricate a conventional CB -based electrode prepared by ink-spread process, a 5cm2 carbon ... onto both sides of the carbon paper The carbon paper was then dried on a hotplate and weighed to determine the Teflon content on the carbon paper Teflon content on the carbon paper was controlled ... CB -based electrodes are spread onto the Teflonized carbon papers, usually consisting of a mixture of carbon black VXC72R and PTFE The weight ratio of VXC72R to PTFE was 7:3 for both anode and...

Ngày tải lên: 11/09/2015, 10:03

... 78 carbon paper TGPH090 showed a sharp G band peak at 1581 cm-1 and a low D band peak, indicating a highly graphitized structure of the carbon fibers making up the carbon paper D band G band ... of multi-walled carbon nanotubes, in which two characteristic peaks representing the D band and the G band were notably identified at 1345 and 1581 cm-1 Raman shift [13] The D´ band was also observed ... obtained on the carbon paper, and the carbon paper surface was modified by the dense CNT layer with tremendously enhanced surface area and porosity This improvement in surface structure and morphology...

Ngày tải lên: 11/09/2015, 10:03

... curves of symmetric Pt/CNT -based MEA and asymmetric MEA with Pt/VXC72R -based anode and Pt/CNT -based cathode Further investigation on the MEA with symmetric Pt/CNT -based anode and cathode was conducted ... VCX72Rbased GDL, and a mg cm-2 blend GDL consisting of 50wt% VXC72R and 50wt% commercial CNTs The VXC72R/CNT blend GDL was made with a mixture of commercial CNTs and carbon black Vulcan XC72R, and ... of a Pt/CNTbased MEA with the Pt/CNT -based electrodes at both anode and cathode, to evaluate the overall effectiveness of the Pt/CNT -based electrode for PEMFC applications The Pt/CNT -based MEA...

Ngày tải lên: 11/09/2015, 10:03

... Wilkinson, and J St-Pierre, Handbook of Fuel Cells – Fundamentals, Technology and Applications, John Wiley and Sons Ltd., Chichester (2003) [3]J.  R Yu, T Matsuura, Y Yoshikawa, M.  N Islam, and M ... (a) Pt/CNT and (b) 20 wt% Pt/VXC72R -based electrodes before and after potentiostatic oxidation process   Figure 5.4 presents the cyclic voltammograms of the two electrodes before and after the ... post-oxidation CVs of the Pt/VXC72R -based electrode, corresponding to the oxidation and reduction of the quinone (Q) and hydroquinone (HQ) species formed on the oxidized carbon material surface [11,...

Ngày tải lên: 11/09/2015, 10:03

... CVD and sputter-deposition techniques can provide a versatile fabrication method to synthesize a variety of Pt/CNT -based electrodes for future PEMFC research and applications These Pt/CNTbased ... [3] D A Landsman, and F J Luczak, U.S Patent 4,316,944 (1982) [4] V Jalan, and E J Taylor, J Electrochem Soc., 130, 2299 (1983) [5] A J Appleby, Energy, 11, 13 (1986) [6] S Mukerjee, and S Srinivasan, ... [1-8] Ross [1, 2] and Landsman [3] reported improved ORR activity in phosphoric acid fuel cells from various Pt3M (M denotes the first-row transition metal, such as Ti, V, Cr, Fe, Ni and Co) alloys,...

Ngày tải lên: 11/09/2015, 10:03

... where carbon nanotubes are not revealed However, regardless the metal oxide employed, carbon nanotubes could be observed in a few regions of the films’ surface (see Fig 2) Therefore, carbon nanotubes ... in the presence of NO2 and CO both at ambient temperature and 150 ◦ C Three concentrations of each gas under study were measured: 100, 200 and 500 ppb for NO2 ; and 1, 10 and 50 ppm for CO The ... 50 ␮m in length and their outer and inner diameters ranged from 15 to nm and to nm, respectively A uniform functionalization with oxygen was applied to the as-provided carbon nanotubes in order...

Ngày tải lên: 19/03/2014, 16:48

... adding ethanol, carbon nanotubes are better dispersed and not randomly entangled in the PPy/MWCNT composites by adding ethanol in solution In addition, the surface of the PPy/MWCNT composites appears ... polymer /carbon nanotubes and controlling the morphology of polymer film on MWCNTs surface Raman spectroscopy has also been used to investigate the surface and interfacial properties of PPy /carbon nanotubes ... cup-stacked-type carbon nanofibers Nano Lett 2003, 3:723-726 Heer W, Poncharal P, Berger C, Gezo J, Song Z, Bettini J, Ugarte D: Liquid carbon, carbon- glass beads, and the crystallization of carbon nanotubes...

Ngày tải lên: 21/06/2014, 03:20

... Sandler JKW: Carbon Nanotube/ Nanofibre Polymer Composites, in Processing and Properties of Nanocomposites New York: World Scientific; 2006 Al-Saleh MH, Sundararaj U: ’A review of vapor grown carbon ... functionalisation and characterisation of carbon nanotubes samples and drafted the manuscript JNP, CP, and VS participated in the nanocomposite samples processing, experimental measurements, analysis and interpretation ... Carabineiro et al.: Effect of the carbon nanotube surface characteristics on the conductivity and dielectric constant of carbon nanotube/ poly(vinylidene fluoride) composites Nanoscale Research Letters...

Ngày tải lên: 21/06/2014, 04:20

Ngày tải lên: 23/02/2014, 02:20

... at 350 ◦ C) (a) Au/WO3 and (b) Pd/WO3 340 A Labidi et al / Sensors and Actuators B 120 (2006) 338–345 Fig Experimental set-up used for C2 H6 O and O3 sensing tests 2.2 Sensing tests procedure ... metals For that, two metals have been chosen Pd and Au, and their effect on the sensor sensitivity towards ozone and ethanol was studied The DC transient and AC responses were analyzed in order to ... Sensors and Actuators B 120 (2006) 338–345 as H2 S [11], NOx [12,13], O3 [14,15] and C2 H6 O [16,17] It is well known that WO3 like the majority of metal oxide -based gas sensors suffer from drift and...

Ngày tải lên: 19/03/2014, 16:48

Ngày tải lên: 24/03/2014, 10:20

... J K, Johnson A T and Fischer J E 2002 Carbon nanotube composites for thermal management Appl Phys Lett 80 2767–9 [4] Prasher R 2007 Thermal conductance of single-walled carbon nanotube embedded ... Cola B A, Xu J and Fisher T S 2009 Contact mechanics and thermal conductance of carbon nanotube array interfaces Int J Heat Mass Transfer 52 3490–503 [11] Cola B A, Amama P B, Xu X and Fisher T ... temperature on carbon nanotube array thermal interfaces Trans ASME, J Heat Transfer 130 114503 [12] Xu J and Fisher T S 2006 Enhanced thermal contact conductance using carbon nanotube array interfaces...

Ngày tải lên: 06/05/2014, 08:53

... intensity and diffraction angle The possibility that carbon contamination Figure FESEM images showing a) top view of a Bi2Te3 pattern electrofrom the CNTs could have influenced the texture and lattice ... for Si (2.6 Â 10À6 KÀ1 [10]) and Bi2Te3 (13.0 Â 10À6 KÀ1 [11]), the theoretical stress-free lateral displacement between the TE film and the substrate was calculated and is also indicated in Table ... Sands, Appl Phys Lett 2008, 92, 013133-1-3 [8] A Ioffe, Semiconductor Thermoelements and Thermoelectric Cooling, Infosearch, London 1958 [9] M S Martin-Gonzalez, A L Prieto, R Gronsky, T D Sands,...

Ngày tải lên: 06/05/2014, 08:58

... NAND (A, B, C) , ∗ NOR (A, B, C)) (4) The carbon nanotube full adder presented in [15] is another majority function based with 14 transistors and capacitors To design this full adder, NAND and ... capacitor-inverter based carbon nanotube full adder Nanoscale Research Letters 2010, 859:862 14 Navi K, Rad RSh, Moaiyeri MH, Momeni A: A low-voltage and energyefficient full adder cell based on carbon nanotube ... capacitors A high-speed capacitor-inverter -based carbon nanotube full adder based on majority-not function is presented in [13] To design this full adder, NAND and NOR functions are used The output...

Ngày tải lên: 21/06/2014, 00:20