Study of field emission characteristics of ultrathin film coated carbon nanotubes core shell structures 3

... the acquisition time per spectrum of ~150 s 3. 4 Field Emission Apparatus Field emission testing of the samples was carried out with a custom-designed field emission system, using parallel plate ... ionization and emission of a core (inner shell) electron whereas in UPS the photon interacts with valence levels of the molecule or solid, leading to ionization by remova...

Ngày tải lên: 11/09/2015, 10:17

... Background 1. 2 Carbon Nanotubes 1. 2 .1 Discovery of Carbon Nanotubes 1. 2.2 Bonding Structures of Carbon Nanotubes 1. 2.3 Properties of Carbon Nanotubes 1. 2.4 Applications of Carbon Nanotubes 2 13 1. 3 ... Nanostructures 10 6 5.2.5 FE Study of Tungsten Oxides Coated CNT Nanostructures 11 0 5.2.6 Summary 11 4 References 11 5 CHAPTER FIELD E...

Ngày tải lên: 11/09/2015, 10:17

... [9-13] 22 Chapter Physics of Field Emission -4 ln ( J/E2) Current density, J ( mA/cm2) -2 -6 -8 -10 - 12 -14 0 .2 0.3 0.4 0.5 1/E 0 Applied electric field, E ( V/µm) Fig 2. 2 The electron emission ... Proc 91, 429 (20 08) 29 Chapter Physics of Field Emission 20 C S Chang, S Chattopadhyay, L C Chen, K H Chen, C W Chen, Y F Chen, R Collazo, and Z Sitar, Phys Rev B 68, 125...

Ngày tải lên: 11/09/2015, 10:17

... heater Fig 4. 1 Schematic setup of the PECVD system used 55    Chapter Synthesis of Vertically-Aligned Carbon Nanotubes 4. 3 Results and Discussion 4. 3.1 Characterization of the As-Grown Carbon Nanotubes ... covered with amorphous carbon, which is the product of the thermal deposition of hydrocarbon [3] 52    Chapter Synthesis of Vertically-Aligned Carbon Nanotubes...

Ngày tải lên: 11/09/2015, 10:18

... these core- shell nanostructures, consisting of core CNTs and shell DLC films The average shell films 125 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes ... multilayer thin film structures or core- shell structures, the FE 132 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon...

Ngày tải lên: 11/09/2015, 10:18

... Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core- Shell Nanostructures with the increase of ambient temperature during emission process, ... average diameter of these nanotubes is comparable to that 136 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotube...

Ngày tải lên: 11/09/2015, 10:18

... Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core- Shell Nanostructures Fig 6.15 Carbon 1s core level XPS spectra of the (a) 50 nm ta C coated ... trend of the threshold fields exhibited by these samples during FE process, 142 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon C...

Ngày tải lên: 11/09/2015, 10:18

... molybdenum oxide -coated carbon nanotubes core- shell nanostructures” Journal of Materials Science 46, 4858 (2011) Jun Yu, and Daniel H C Chua “Enhanced field emission properties of hydrogenated ... H C Chua “Hydrogenation and its effects on the field emission characteristics of tetrahedral amorphous carbon coated carbon nanotubes Journal of Physical Chemistry...

Ngày tải lên: 11/09/2015, 10:18

... electrons are emitted from the graphene tip creating an electron current that can be modulated on and off Fig Fabrication process of graphene sheets using a mechanical exfoliation method The graphene ... vacuum chamber, two tungsten tips were located on the graphene sample; one was contacted directly to the sample and grounded as a cathode, and the other was placed an arbi...

Ngày tải lên: 22/06/2014, 00:20

... bimaterial fracture studies of O'Day and Curtin (2005) to thin film interfacial fracture Lengthscale dependent plasticity, an important feature of plasticity in micrometer-sized films, naturally ... A DISCRETE DISLOCATION STUDY OF THIN FILM INTERFACIAL FRACTURE Chng Chia-K'ai Audrey (B Eng (Hons.), M Eng, NUS) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF...

Ngày tải lên: 11/09/2015, 21:37

... behavior of an oxide film on a copper electrode in a 0.1 N NaOH solution has been studied by the in- situ photothermal spectroscopy (PTS) method using a polyvinylidene difluoride (PVDF) pyroelectric film ... yield information regarding only the rate of reaction, the influence of diffusion, concentration, temperature, and so on They cannot give information about...

Ngày tải lên: 17/09/2015, 17:20

Ngày tải lên: 29/11/2014, 07:21

... perceptions and behaviour, advocating a critical approach to the study of metaphors in discourse Finally, it is also important to note that modern consumers of news texts are assailed by a gamut of alternative ... with a generic system of shared values and metaphorical evaluations It is these particular sets of metaphorical evaluations and group ideologies that...

Ngày tải lên: 10/09/2015, 09:22

... surface of the SiNWs Because of the high standard electrode potential of the Au3 + /Au0 couple, Au3 + has high polarization and high chemical reactivity Au3 + could be easily reduced to Au0 in air ... mass-production of highly aligned SiNWs and their core/ shell structures with metal nanoparticles for the future applications in microelectronic and optoelectronic...

Ngày tải lên: 16/03/2014, 15:06

... gas sensor for monitoring ammonia, Mater Char 58 (2007) 680–684 Please cite this article in press as: M Sánchez, M.E Rincón, Sensor response of sol–gel multiwalled carbon nanotubes-TiO2 composites ... doctorate degree under Prof Rincón’s surpevision Please cite this article in press as: M Sánchez, M.E Rincón, Sensor response of sol–gel multiwalled carbon nanotub...

Ngày tải lên: 20/03/2014, 13:07