Semiconductor-enriched single wall carbon nanotube networks applied to field effect transistors

Izard, Nicolas; Kazaoui, Saïd; Hata, Kenji; Okazaki, Toshiya; Saito, Tetsuya; Iijima, Sumio; Minami, Nobutsugu

doi:10.1063/1.2939560

Cited by 145 publications

(134 citation statements)

References 19 publications

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“…The Raman spectra provided proof of the separation of the met-and sem-SWNTs [50][51][52] . For the HiPco-produced SWNTs, based on the Kataura plot 53,54 , we can estimate the ratio of the sem-or met-SWNTs using the RBM region in the Raman spectra measured by excitation at 633 nm, which is a widely used method 31,36,43,55 . Compared with the spectrum of the as-produced SWNTs (black line in Fig.…”

Section: Synthesis Of Cp-mmentioning

confidence: 99%

“…Moreover, we revealed that the PFO copolymers with a bulky optically active moiety could separate the right-and left-handed sem-SWNTs 35 . However, there are several serious problems when using PFOs; that is, difficulty in the removal of the wrapped PFOs from the SWNT/PFO composites 36,37 as well as their low extraction efficiency from the as-produced SWNTs 30,31 .…”

mentioning

confidence: 99%

“…In order to preserve the intrinsic SWNT properties, the latter method has an advantage over the former one. Recently, various methods for the separation of sem-and met-SWNTs including wrapping by SWNT solubilizers, such as DNAs 20,21 and p-conjugated or non-conjugated copolymers 11,[22][23][24] , density gradient ultracentrifugation 25,26 and gel chromatography techniques 12,14,[27][28][29][30][31][32][33][34][35][36][37][38][39] , have been reported. However, the reported techniques are rather complex and the efficiency is not very high.…”

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confidence: 99%

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Semiconducting single-walled carbon nanotubes sorting with a removable solubilizer based on dynamic supramolecular coordination chemistry

2014

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Highly pure semiconducting single-walled carbon nanotubes (SWNTs) are essential for the next generation of electronic devices, such as field-effect transistors and photovoltaic applications; however, contamination by metallic SWNTs reduces the efficiency of their associated devices. Here we report a simple and efficient method for the separation of semiconducting-and metallic SWNTs based on supramolecular complex chemistry. We here describe the synthesis of metal-coordination polymers (CP-Ms) composed of a fluorene-bridged bis-phenanthroline ligand and metal ions. On the basis of a difference in the 'solubility product' of CP-M-solubilized semiconducting SWNTs and metallic SWNTs, we readily separated semiconducting SWNTs. Furthermore, the CP-M polymers on the SWNTs were simply removed by adding a protic acid and inducing depolymerization to the monomer components. We also describe molecular mechanics calculations to reveal the difference of binding and wrapping mode between CP-M/semiconducting SWNTs and CP-M/metallic SWNTs. This study opens a new stage for the use of such highly pure semiconducting SWNTs in many possible applications.

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Section: Synthesis Of Cp-mmentioning

confidence: 99%

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Semiconducting single-walled carbon nanotubes sorting with a removable solubilizer based on dynamic supramolecular coordination chemistry

2014

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“…Here, we experimentally demonstrate optical gain in carbon nanotubes at a wavelength of 1.3 µm at room temperature. Semiconducting SWNT (s-SWNT) extracted by the previously described polyfluorene (PFO) method [17] were drop cast on glass substrate. Pure s-SWNT thin films will be hereafter designated as sample A, while a control sample made with a blend of s-and m-SWNT will be named sample B.…”

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confidence: 99%

Optical gain in carbon nanotubes

Gaufrès

Izard

Roux

et al. 2010

Applied Physics Letters

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Semiconducting single wall carbon nanotubes (s-SWNT) have proved to be promising material for nanophotonics and optoelectronics. Due to the possibility of tuning their direct band gap and controlling excitonic recombinations in the near-infrared wavelength range, s-SWNT can be used as efficient light emitters. We report the first experimental demonstration of room temperature intrinsic optical gain as high as 190 cm −1 at a wavelength of 1.3 µm in a thin film doped with (8,7) s-SWNT. These results constitute a significant milestone towards the development of laser sources based on carbon nanotubes for future high performance integrated circuits. [4]. Luminescence properties of carbon nanotubes attracted a special interest, and became a leading component in various configurations, not only as individualised entities in micelle surfactant, but also when suspended over trenches [8] or deposited onto chip surface [9]. Numerous works prove that the nanotube environment plays a primordial role in their emission behaviour [10][11][12], and several nonradiative de-excitation mechanisms exist, either by Auger recombination [13] or energy transfers to metallic SWNT (m-SWNT) [14] or excitons [15]. These mechanisms lead to a strong competition between bright and dark excitons and a limited photoluminescence lifetime [16]. Up to now, a main challenge was to obtain light amplification in carbon nanotubes. Here, we experimentally demonstrate optical gain in carbon nanotubes at a wavelength of 1.3 µm at room temperature. Semiconducting SWNT (s-SWNT) extracted by the previously described polyfluorene (PFO) method [17] were drop cast on glass substrate. Pure s-SWNT thin films will be hereafter designated as sample A, while a control sample made with a blend of s-and m-SWNT will be named sample B. Both layers have a homogeneous carbon nanotube density and a thickness of 1 µm. The coating was made to obtain regular and vertical edge facets [18]. Absorbance spectrum of such initial s-SWNT/PFO solution and photoluminescence spectrum of drop-casted s-SWNT/PFO solution on glass substrate are reported in ref 12. Optical properties characterized by the E 22 and E 11 optical transitions are related to strongly bound excitons [19]. Photons absorbed on the E 22 optical transition create excitons at the carbon nanotube surface and light emission is produced due to the exciton recombination through the E 11 optical transi- tion. The polymer host matrix (PFO) presents absorption and photoluminescence peaks in the UV-visible spectrum range, and is optically inactive (no absorption and no emission) on the near infrared carbon nanotube absorption and emission range, without any evidence of energy transfer towards carbon nanotubes [20].Optical gain measurements were first performed on sample A using the variable strip length (VSL) method [21]. The sample was optically excited by an Optical Parametric Oscillator laser emitting at a wavelength of 740 nm, pumped by a two nanosecond pulsed Nd:YAG laser at 355 nm. Amplified Spontaneous Emission (ASE) ...

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“…Composites of conducting polymers with carbon nanotubes (CNTs) [1][2][3] have attracted considerable attention in the past few years because of their potential applications in polymer light emitting diodes [4,5], photovoltaic cells and photodiodes [6], field effect transistors [7], optical limiting devices [8], supercapacitors [9], sensors [10], etc. In fact, the extensive and exhaustive applications of CNTs in the field of polymer composites has perhaps exhilarated the scientific community to consider nanotubes as a part of the polymer family [11] rather than as a novel nanotechnology product.…”

Section: Introductionmentioning

confidence: 99%

Low electrical percolation threshold and PL quenching in solution-blended MWNT–MEH PPV nanocomposites

Bansal

Srivastava

Lal

et al. 2010

Journal of Experimental Nanoscience

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Pristine multiwall carbon nanotubes (MWNT) (synthesised using CVD approach) and poly[2-methoxy-5-(2 0 -ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH PPV) based composites were prepared using a solution blending approach by employing various nanotube weight fractions. The prepared composites have been characterised using SEM, AFM, PL spectroscopy, UV-Vis studies and I-V characterisation. Increase in MWNT concentration has been found to quench the PL spectra of the composites suggesting photoinduced electron transfer from polymer to MWNT. The increase in MWNT concentration also increases the absorption of the composites. PL quenching and increase in absorption are desirable attributes for the design of photovoltaic systems. Also, the electrical conductivities of the composites can be described by the scaling law based on percolation theory and based upon the scaling law, a low electrical percolation threshold value (0.5 wt%) has been obtained for this composite system. The value of t (critical exponent) based on percolation theory is found to be 1.11. The low value of t is attributed to the aggregation and bundling of nanotubes in the prepared composites, as is evident from SEM and AFM micrographs. The turnon voltage is also found to be reduced in the case of polymer-nanotube composite system as compared to the pristine polymer system. Also, it has been observed that at higher weight percentages, the MWNTs form an immensely dense network and act as nanometric heat sinks, thus preventing the build up of large thermal effects, caused by the increased current in the pixels at higher voltages. Analysis of these optical and electrical properties is important before utilising the composite in organic electronics applications, in order to obtain more scientifically correct and repeatable results with fabricated devices.

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Semiconductor-enriched single wall carbon nanotube networks applied to field effect transistors

Cited by 145 publications

References 19 publications

Semiconducting single-walled carbon nanotubes sorting with a removable solubilizer based on dynamic supramolecular coordination chemistry

Semiconducting single-walled carbon nanotubes sorting with a removable solubilizer based on dynamic supramolecular coordination chemistry

Optical gain in carbon nanotubes

Low electrical percolation threshold and PL quenching in solution-blended MWNT–MEH PPV nanocomposites

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