Growth of Semiconducting Single-Walled Carbon Nanotubes by Using Ceria as Catalyst Supports

Qin, Xiaojun; Peng, Fei; Yang, Feng; He, Xiaohui; Huang, Huixin; Luo, Da; Yang, Juan; Wang, Sheng; Liu, Haichao; Peng, Lian‐Mao; Li, Yan

doi:10.1021/nl403515c

Cited by 86 publications

(86 citation statements)

References 38 publications

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“…In the absence of a routine synthesis technique able to provide single-chirality SWCNT samples, various ways aiming at controlling the electronic properties of carbon * corresponding author : salome.forel@polytechnique.edu; alice.castan@onera.fr; hakim.amara@onera.fr nanotubes have been investigated [20], especially to favor the growth of semiconducting SWCNTs (s-SWCNTs) highly desired for applications in microelectronics. Two main routes are used: the selective etching of the metallic SWCNTs (m-SWCNTs) during the growth process [21][22][23][24][25][26], or the burning of m-SWCNTs after integration into a device [27]. Nevertheless, obtaining s-SWCNT-enriched samples is not sufficient for designing efficient devices: a fine-tuning of the diameter of the SWCNTs, which is inversely proportional to the gap, can greatly contribute to improving device performance [26].…”

Section: Introductionmentioning

confidence: 99%

Tuning bimetallic catalysts for a selective growth of SWCNTs

et al. 2019

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Recent advances in structural control during the synthesis of SWCNTs have in common the use of bimetallic nanoparticles as catalysts, despite the fact that their exact role is not fully understood. We therefore analyze the effect of the catalyst's chemical composition on the structure of the resulting SWCNTs by comparing three bimetallic catalysts (FeRu, CoRu and NiRu). A specific synthesis protocol is designed to impede the catalyst nanoparticle coalescence mechanisms and stabilize their diameter distributions throughout the growth. Owing to the ruthenium component which has a limited carbon solubility, tubes grow in tangential mode and their diameter is close to that of their seeding nanoparticle. By using as-synthesized SWCNTs as a channel material in field effect transistors, we show how the chemical composition of the catalysts and temperature can be used as parameters to tune the diameter distribution and semiconducting-to-metallic ratio of SWCNT samples. Finally, a phenomenological model, based on the dependence of the carbon solubility as a function of catalyst nanoparticle size and nature of the alloying elements, is proposed to interpret the results.

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Section: Introductionmentioning

confidence: 99%

Tuning bimetallic catalysts for a selective growth of SWCNTs

et al. 2019

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“…Growth of pure (100%) m-SWNTs or s-SWNTs is still being pursued. Recent works [8], [9], [10], [11], [12], [13], [14], [15], [16] reported SWNT enrichments based on electronic type [8], [9], [10], [11], [12] and specific chiralities [15], [16]. However, achieving ondemand control of SWNTs type is still far from being solved.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent separation of metallic and semiconducting carbon nanotubes using gel agarose chromatography

Yahya

Bonaccorso

Clowes

et al. 2015

Carbon

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Post-synthesis separation of metallic (m-SWNTs) and semiconducting (s-SWNTs) single-wall carbon nanotubes (SWNTs) remains a challenging process. Gel agarose chromatography is emerging as an efficient and large scale separation technique. However, the full (100%) separation has not been achieved yet, mainly due to the lack of understanding of the underlying mechanism. Here, we study the temperature effect on the SWNTs separation via gel agarose chromatography, for four different SWNT sources. Exploiting a gel agarose micro-beads filtration technique we achieve up to 70% m-SWNTs and over 90% s-SWNTs, independent of the source material. The process is temperature dependent, with yields up to 95% for s-SWNT (HiPco) at 6 °C. Temperature affects the sodium dodecyl sulfate surfactant-micelle distribution along the SWNT sidewalls, thus determining the effectiveness of the SWNTs sorting by electronic type. The sorted SWNTs are then used to fabricate transistors with very low OFF-currents (∼10−13 A), high ON/OFF current ratio (>106) and charge carriers mobility ∼ 40 cm2 V−1 s−1

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“…[3][4][5][6][7] Recent progress in growth, purification, and placement of carbon nanotubes demonstrates that the main hurdles for using carbon nanotubes in semiconductor applications are surpassable. [8][9][10][11][12] However, many challenges for reliable fabrication of CNTFETs still remain.…”

mentioning

confidence: 99%