Mechanical fabrication of carbon nanotube/TiO<sub>2</sub> nanoparticle composite films and their field‐emission properties

He, Kebo; Su, Juan; Guo, Dengzhu; Xing, Yingjie; Zhang, Gengmin

doi:10.1002/pssa.201084202

Cited by 8 publications

(2 citation statements)

References 26 publications

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“…Furthermore, the turn-on field (corresponding to 10 μA/cm 2 ) from sample II–QDs was 1.3 V/μm, which was much lower than that obtained from densified sample II (2.4 V/μm). This value was also comparable to that reported on hybrid CNT/TiO 2 nanoparticles composite film (turn-on was 1.3 V/μm). With an enhancement factor of 3014 ± 258, sample II–QDs exhibit much better field emission in comparison to densified sample II, whose enhancement factor was determined to be 1193 ± 108.…”

Section: Resultssupporting

confidence: 90%

Field Emission from Decorated Carbon Nanotube–QDs Microstructures with a View to the Dominant Electron Paths

et al. 2013

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We present a study on the field emission properties of a hybrid system comprised of carbon nanotube (CNT) micropillars decorated with quantum dots (QDs). With controlled decoration of QDs on the CNT micropillars through a simple assisted self-assembly process, further enhancement in the field emitting property of the hybrid microstructures was detected. Upon irradiation of the hybrid structure with a broad visible-light laser beam, additional enhanced field emission was observed. Analyses using fluorescence and confocal microscopy, as well as ultraviolet photoelectron spectroscopy, suggested that electron transfer from QDs to the CNT strands and the reduced work function of the hybrid system as the contributing factors behind the enhanced field emissions. In addition, we discovered that the field emission process gave rise to lost of the QDs’ fluorescence luminosity on the microstructures in specific patterns attributable to transfers of charge carrier from QDs to the CNTs. This observation provided a new means to understand and to determine the predominant 3D path of the emission of electrons from the sample down to a micrometer scale level.

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Section: Resultssupporting

confidence: 90%

Field Emission from Decorated Carbon Nanotube–QDs Microstructures with a View to the Dominant Electron Paths

et al. 2013

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“…Among the possible methods of characterizing the complex FE process are: the vacuum condition changes, 1 the influence of the emitter substrate temperature, 2 the visualization of the emission sites distribution, 3 the temperature allocation near the FE centers by means of infrared microscopy, 4 and by defining the volatile product composition by residual gas analysis methods. [4][5][6] Despite the progress in the use of mass spectrometer methods for the volatile product diagnostics accompanying FE, the number of such investigations is not enough.…”

Section: Introductionmentioning

confidence: 99%

Mass-spectrum investigation of the phenomena accompanying field electron emission

Popov

Kolosko

Filippov

et al. 2015

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Articles you may be interested inFlexible carbon nanotube-array cathodes: Fabrication and bending effect on field-electron emission J. Vac. Sci. Technol. B 28, C2C5 (2010); 10.1116/1.3363855 Temperature evaluation of field emitting points for polymer-carbon nanotube composite using time-of-flight mass spectrometry J. Multi-walled nanotube polymer composite degradation under high emission current regime as revealed by mass spectrometry J. Vac. Sci. Technol. B 26, 745 (2008); 10.1116/1.2894895 Field electron emission from free-standing flexible PDMS-supported carbon-nanotube-array filmsThis work describes the investigation of carbon nanotube-polymeric nanocomposites and other multiple-tip emitters based on a new reflectron-type time-of-flight mass spectrometer specialized for field emission (FE) tasks, as well as a multichannel acquisition system and on-line processing of the current-voltage characteristics and other parameters of flat multipoint field emitters. Evidence concerning the transfer of large molecular clusters of the emitter material to the opposite electrode for as-prepared samples is presented. It is determined that a vacuum discharge phenomenon in the interelectrode gap is accompanied by strong emission of acetylene. It is also shown that the main volatile product in the FE experiment is hydrogen. The CO and CO 2 ratio during the FE experiment is not constant, and hence, arises from different processes. These oxygen-containing volatile products in the spectrum are observed for as-prepared samples at the vacuum discharge, and also arise after long-term heating of the anode surface by an electron current.

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Improved field emission properties of MgO‐nanoparticle‐doped carbon nanotube films and their application in miniature vacuum gauges

Guo

Xing

et al. 2013

Physica Status Solidi (a)

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Composite films of carbon nanotubes (CNTs) and MgO nanoparticles are fabricated on metal substrates as field emitters by a simple mechanical rubbing method. The field emission properties of the CNT films could be dramatically improved by mixing an optimum proportion (∼7 wt%) of MgO nanoparticles. It lowers the turn‐on field to 1.3 V µm−1 and the threshold field to 2 V µm−1, and also increases the field emission stability and uniformity. Such CNTs–MgO films are applied as cathode in ionization vacuum gauges. The gauges, with the advantages of small size and low power consumption, exhibit good measurement linearity in vacuum pressure range from 8 × 10−6 to 2 × 10−2 Pa, and a sensitivity of 0.2 Pa−1.

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Mechanical fabrication of carbon nanotube/TiO₂ nanoparticle composite films and their field‐emission properties

Cited by 8 publications

References 26 publications

Field Emission from Decorated Carbon Nanotube–QDs Microstructures with a View to the Dominant Electron Paths

Field Emission from Decorated Carbon Nanotube–QDs Microstructures with a View to the Dominant Electron Paths

Mass-spectrum investigation of the phenomena accompanying field electron emission

Improved field emission properties of MgO‐nanoparticle‐doped carbon nanotube films and their application in miniature vacuum gauges

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Mechanical fabrication of carbon nanotube/TiO2 nanoparticle composite films and their field‐emission properties

Cited by 8 publications

References 26 publications

Field Emission from Decorated Carbon Nanotube–QDs Microstructures with a View to the Dominant Electron Paths

Field Emission from Decorated Carbon Nanotube–QDs Microstructures with a View to the Dominant Electron Paths

Mass-spectrum investigation of the phenomena accompanying field electron emission

Improved field emission properties of MgO‐nanoparticle‐doped carbon nanotube films and their application in miniature vacuum gauges

Contact Info

Product

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Mechanical fabrication of carbon nanotube/TiO₂ nanoparticle composite films and their field‐emission properties