Chiral-selective growth of single-walled carbon nanotubes on stainless steel wires

He, Maoshuai; Fedotov, Pavel V.; Obraztsova, E. D.; Viitanen, Ville; Sainio, Jani; Jiang, Hua; Kauppinen, Esko I.; Niemelä, Marita; Lehtonen, Juha

doi:10.1016/j.carbon.2012.05.007

Cited by 28 publications

(21 citation statements)

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“…[35] Therefore, each calibrated species abundance is obtained through dividing the experimental PL intensity (peak height above the baseline) by a theoretical intensity factor. [36] From the calculated abundance of relative species in Table1, we can find that AGE/w-PFO mainly selects for (7,6), (8,4), (8,6), (8,7), (9,4), (9,5), and (10,3).…”

Section: Resultsmentioning

confidence: 98%

“…The absorbance peaks in the 870-1600 nm, 500-870 nm and 440-670 nm range correspond to the first and second van Hove electronic transitions of semiconducting species ( 11 S E and S 22 E ) and first van Hove electronic transitions of metallic species ( M 11 E ), respectively. Metallic species such as (7, 7), (8,5), (9,9), (10, 7), (11,5), and (13,4) are detected and shown in the pristine HiP-CO SWNTs spectrum. For the semiconducting fraction extracted from the upper fraction after AGE/w-PFO, the peaks in the region of M 11 E decrease obviously which suggests the reduction of metallic species in semiconducting fraction.…”

Section: Resultsmentioning

confidence: 99%

“…Although some research has been done to directly synthesize chiral selective nanotubes, the purity and yield of s-SWNTs are not satisfied. [8,9] In order to gain pure and scalable s-SWNTs, separation of raw carbon nanotube materials is still an optimal choice until now.In the last decade, various techniques have been developed to separate semiconducting SWNTs, such as polymer wrapping, density gradient ultracentrifugation (DGU), sephacryl gel-based chromatography, agarose gel, two-phase separation, etc. [10][11][12][13][14][15][16][17][18][19][20][21] Each of these techniques is able to separate SWNTs into metallic and semiconducting species in different level of success.…”

mentioning

confidence: 99%

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Sorting Semiconducting Single‐Walled Carbon Nanotubes by Water‐Soluble Polyfluorene Assisted Electrophoresis and Its Application in Field‐effect Transistors

Zhu

Wang

2015

Chin. J. Chem.

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We report a considerably promising method based on agarose gel electrophoresis (AGE) to separate singlewalled carbon nanotubes by adding a water-soluble polyfluorene (w-PFO) as surfactant into the agarose gel. In this effective method, the AGE/w-PFO gel network will trap more semiconducting single-walled carbon nanotubes (SWNTs) with the assistance of w-PFO, for the strong interaction between w-PFO and semiconducting species. The optical absorbance, photoluminescence emission and resonant Raman scattering characterization were used to verify the separation effect. The purity of separated semiconducting species is as high as (98±1)%. The demonstrated field effect transistors give the on/off ratio and mobility about 27000 and 10.2 cm 2 •V −1•s −1 , respectively.Keywords agarose gel electrophoresis, field effect transistors, semiconducting single-walled carbon nanotubes, water-soluble polyfluorene IntroductionSingle-walled carbon nanotubes (SWNTs) have attracted widespread attention in recent years due to the unique structure.[1] Their extraordinary mechanical, chemical and electronic properties make them potentially suitable for a wide range of applications such as the field effect transistors (FETs), chemical sensors, logic circuits and transparent electrodes and emitter of electrospray ionization mass spectrometry. [2][3][4][5][6] Particularly, the high charge-carrier mobility of semiconducting SWNTs has a promising prospect for FETs. [7] However, SWNTs are generally produced as a mixture of semiconducting SWNTs (s-SWNTs) and metallic SWNTs (m-SWNTs) which is a barrier for the application in electronic fields. Although some research has been done to directly synthesize chiral selective nanotubes, the purity and yield of s-SWNTs are not satisfied. [8,9] In order to gain pure and scalable s-SWNTs, separation of raw carbon nanotube materials is still an optimal choice until now.In the last decade, various techniques have been developed to separate semiconducting SWNTs, such as polymer wrapping, density gradient ultracentrifugation (DGU), sephacryl gel-based chromatography, agarose gel, two-phase separation, etc. [10][11][12][13][14][15][16][17][18][19][20][21] Each of these techniques is able to separate SWNTs into metallic and semiconducting species in different level of success. In spite of their promises, each method has its own limited capability to scale up or requires a complex process of removing the surfactants or polymers. For example, Tanaka et al. [22] showed that agarose gel electrophoresis (AGE) can be used to separate metallic from semiconducting nanotubes effectively using sodium dodecyl sulfate (SDS) as the dispersant. The article reported that under the effect of electrophoresis, SWNTs wrapped with SDS have different level of interaction with gel, in which m-SWNTs migrated toward the anode faster than s-SWNTs. SWNTs thereby can be separated into two parts, metallic fraction and semiconducting fraction. Mesgari et al. [23] have made an improvement of AGE method to increase the purity and yield of s-S...

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Sorting Semiconducting Single‐Walled Carbon Nanotubes by Water‐Soluble Polyfluorene Assisted Electrophoresis and Its Application in Field‐effect Transistors

Zhu

Wang

2015

Chin. J. Chem.

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“…Lately, techniques using chemical vapor deposition (CVD) on substrate surfaces have been studied intensively [20][21][22][23][24][25][26][27][28] so that controllability of the product structure, purity, and yield have been significantly improved.…”

Section: Introductionmentioning

confidence: 99%

“…Under such circumstances, variety of techniques to synthesize CNTs have been highly developed [13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Cr as a key factor for direct synthesis of multi-walled carbon nanotubes on industrial alloys

Sano

Yamamoto²,

Tamon³

2014

Chemical Engineering Journal

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Designing Catalysts for Chirality‐Selective Synthesis of Single‐Walled Carbon Nanotubes: Past Success and Future Opportunity

Zhang

et al. 2018

Advanced Materials

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A major obstacle for the applications of single-walled carbon nanotubes (SWNTs) in electronic devices is their structural diversity, ending in SWNTs with diverse electrical properties. Catalytic chemical vapor deposition has shown great promise in directly synthesizing high-quality SWNTs with a high selectivity to specific chirality (n, m). During the growth process, the tube-catalyst interface plays crucial roles in regulating the SWNT nucleation thermodynamics and growth kinetics, ultimately governing the SWNT chirality distribution. Starting with the introduction of SWNT growth modes, this review seeks to extend the knowledge about chirality-selective synthesis by clarifying the energetically favored SWNT cap nucleation and the threshold step for SWNT growth, which describes how the tube-catalyst interface affects both the nucleus energy and the new carbon atom incorporation. Such understandings are subsequently applied to interpret the (n, m) specific growth achieved on a variety of templates, such as SWNT segments or predefined molecular seeds, transition metal (Fe, Co and Ni)-containing catalysts at low reaction temperatures, W-based alloy catalysts, and metal carbides at relatively high reaction temperatures. The up to date achievements on chirality-controlled synthesis of SWNTs is summarized and the remaining major challenges existing in the SWNT synthesis field are discussed.

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Chiral-selective growth of single-walled carbon nanotubes on stainless steel wires

Cited by 28 publications

References 11 publications

Sorting Semiconducting Single‐Walled Carbon Nanotubes by Water‐Soluble Polyfluorene Assisted Electrophoresis and Its Application in Field‐effect Transistors

Sorting Semiconducting Single‐Walled Carbon Nanotubes by Water‐Soluble Polyfluorene Assisted Electrophoresis and Its Application in Field‐effect Transistors

Cr as a key factor for direct synthesis of multi-walled carbon nanotubes on industrial alloys

Designing Catalysts for Chirality‐Selective Synthesis of Single‐Walled Carbon Nanotubes: Past Success and Future Opportunity

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