Electron field emission properties of conducting polymer coated multi walled carbon nanotubes

Rakhi, R.B.; Sethupathi, K.; Ramaprabhu, Sundara

doi:10.1016/j.apsusc.2008.04.094

Cited by 36 publications

(43 citation statements)

References 26 publications

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“…The first report on 'template-free' (soft template) synthesis of conducting polymer nanostructures is due to Wan and his group, who obtained micro/nanotubules of polyaniline and polypyrrole. [22][23][24][25][26][27][28][29][30][31] Regarding FE studies of conducting polymers, the first report is due to Musa et al, who have investigated FE characteristics of poly(3-octythiophene). Although in most of these studies, the synthesis is based on single phase oxidative polymerization, two-phase oxidative polymerization (interfacial polymerization), and electrospinning routes have also been used to prepare conducting polymer nanostructures.…”

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confidence: 99%

“…21 As the 1-D nanostructures such as, wires, tubes, rods, needles, etc. [28][29][30][31] In this paper, we report on the synthesis of conducting PANI nanotubes by simple single phase chemical oxidation route and their field emission investigations. [22][23][24][25][26][27][28][29][30][31] Regarding FE studies of conducting polymers, the first report is due to Musa et al, who have investigated FE characteristics of poly(3-octythiophene).…”

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confidence: 99%

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Promising Field Emission Characteristics of Polyaniline Nanotubes

Patil

Koiry

Aswal

et al. 2011

J. Electrochem. Soc.

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Polyaniline (PANI) nanotubes have been synthesized employing chemical polymerization with acetic acid as dopant. The synthesized PANI nanotubes were characterized by Scanning electron microscope (SEM), Transmission electron microscope (TEM), Uv-visible spectroscopy and Fourier transform infrared spectroscopy (FTIR). The SEM and TEM analysis clearly reveals the formation of PANI nanotubes, with outer diameter in the range of 50-150 nm and length in several microns. The Uv-visible and FTIR spectra exhibit characteristic features corresponding to electrically conducting phase of doped PANI. Field emission (FE) studies of the PANI nanotubes were performed in planar diode configuration at a base pressure of $1 Â 10 À8 Torr. From the FE results, value of the turn on field required to draw an emission current density of 1 A/cm 2 was found to be 1.55 V/m and current density of 1 mA/cm 2 has been drawn at an applied field of 3.8 V/m. The PANI nanotubes emitter exhibited good emission current stability at pre-set value of 1 A over duration of more than 3 h. The ease of synthesis route and interesting field emission properties recommend the PANI nanotubes as a promising material for field emission based applications in vacuum micro-nanoelectronic devices.

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confidence: 99%

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confidence: 99%

Promising Field Emission Characteristics of Polyaniline Nanotubes

Patil

Koiry

Aswal

et al. 2011

J. Electrochem. Soc.

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“…It is seen that, the improved functionality of the conducting polymer nanocomposites also leads to enhancement in their emission characteristics. In this regard, Rakhi et al and Nair et al have carried out FE studies of different conducting polymer nanocomposites [14][15][16]. Recently, we have reported field emission of different nanostructures (such as nanopetals, nanocrystals, nanofibers, nanotubes etc.)…”

Section: Introductionmentioning

confidence: 95%

“…Since the 1-D nanostructures, owing to their high aspect ratio, offer unique advantages for their practical application as field emitters, attempts have been made to synthesize conducting polymers in 1-D nanometric form and study their field emission (FE) characteristics. Followed by the first report on FE properties of poly(3-octythiophene) by Musa et al, various research groups have carried out FE investigations of different conducting polymers and nanocomposites [9][10][11][12][13][14][15][16][17][18][19][20]. Wang et al have synthesized polyaniline (PANI) nanofibril array using AAO template and reported FE behaviour [10].…”

Section: Introductionmentioning

confidence: 96%

Facile synthesis of cadmium sulphide-polyaniline (CdS-PANI) nanocomposite and its field emission investigations

et al. 2015

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A simple two step chemical route has been employed to synthesize cadmium sulphide -polyaniline (CdS-PANI) nanocomposite. In the first step PANI nanotubes are synthesized by oxidative polymerization followed by deposition of CdS nanoparticles on them. In order to investigate the structural, chemical and optical properties of the CdS-PANI nanocomposite, various characterization techniques have been used. The microscopic analysis reveals that the PANI nanotubes having length in several microns with cavity diameter of~10 to 20 nm are decorated with CdS nanoparticles of 5 to 10 nm. The XRD spectrum indicates formation of crystalline hexagonal phase of CdS, supported by the SAED pattern obtained during TEM analysis. The FTIR and UVvisible spectra confirm formation of the conducting phase of PANI. The field emission studies of the CdS-PANI nanocomposite indicate low turn on field of 1.4 V/μm, corresponding to emission current density~1 μA/cm 2 , and emission current density of~5.5 mA/cm 2 has been drawn at an applied field of 3.8 V/μm. Furthermore the emission current is observed to be fairly stable at the preset values over long term duration. The enhanced field emission properties, exhibited in terms of low turn on field, and delivery of very high emission current density at relatively lower applied field, are attributed to the nanometric dimensions of the PANI nanotubes and CdS nanoparticles, and modulation of electronic properties due to formation of heterojunction. The overall field emission results propose the CdS-PANI nanocomposite as a promising material for field emission based devices.

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“…Such temperatures severely limit the selection of the substrate material. On the other hand the indirect coating method [9][10][11][12][13] including screen printing, spray, dip, and filtration utilizes CNT colloidal solution or paste, and makes coating on a substrate in the form of a CNT layer. It is a simple process and, thus, suitable for mass production of the emitter.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotube field emitter irradiated by proton beam

Lee

Kim

et al. 2010

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

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The present study adopts proton irradiation to solve the problems, such as performance degradation due to outgassing and weak adhesion, of a carbon nanotube (CNT) field emitter fabricated by the indirect coating method. The protons collide against the CNT layer and the copper film, and results in thinning out of the CNTs and particle migration of the copper constituents. This process reduces the turn-on field and increases the lifetime of CNT emitters, respectively. Numerical simulations have been performed to understand the results from experiments by using a software, SRIM 2008.

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Electron field emission properties of conducting polymer coated multi walled carbon nanotubes

Cited by 36 publications

References 26 publications

Promising Field Emission Characteristics of Polyaniline Nanotubes

Promising Field Emission Characteristics of Polyaniline Nanotubes

Facile synthesis of cadmium sulphide-polyaniline (CdS-PANI) nanocomposite and its field emission investigations

Carbon nanotube field emitter irradiated by proton beam

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