Towards type-selective carbon nanotube growth at low substrate temperature via photo-thermal chemical vapour deposition

Chen, Jeng-Shiung; Stolojan, Vlad; Silva, S. Ravi P.

doi:10.1016/j.carbon.2014.12.023

Cited by 20 publications

(40 citation statements)

References 49 publications

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“…This suggests the presence of a small proportion of SWCNTs. The radii of the SWCNTs deduced from ω RBM = ( A/d t ) + B are 1.07 nm and 1.03 nm35. Where ω RBM is the Raman frequency shift of the RBM in wavenumber (cm −1 ) and d t is the diameter of the CNT.…”

Section: Resultsmentioning

confidence: 99%

Multi-Functional Carbon Fibre Composites using Carbon Nanotubes as an Alternative to Polymer Sizing

Pozegic

Anguita

Hamerton

et al. 2016

Sci Rep

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Carbon fibre reinforced polymers (CFRP) were introduced to the aerospace, automobile and civil engineering industries for their high strength and low weight. A key feature of CFRP is the polymer sizing - a coating applied to the surface of the carbon fibres to assist handling, improve the interfacial adhesion between fibre and polymer matrix and allow this matrix to wet-out the carbon fibres. In this paper, we introduce an alternative material to the polymer sizing, namely carbon nanotubes (CNTs) on the carbon fibres, which in addition imparts electrical and thermal functionality. High quality CNTs are grown at a high density as a result of a 35 nm aluminium interlayer which has previously been shown to minimise diffusion of the catalyst in the carbon fibre substrate. A CNT modified-CFRP show 300%, 450% and 230% improvements in the electrical conductivity on the ‘surface’, ‘through-thickness’ and ‘volume’ directions, respectively. Furthermore, through-thickness thermal conductivity calculations reveal a 107% increase. These improvements suggest the potential of a direct replacement for lightning strike solutions and to enhance the efficiency of current de-icing solutions employed in the aerospace industry.

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Section: Resultsmentioning

confidence: 99%

Multi-Functional Carbon Fibre Composites using Carbon Nanotubes as an Alternative to Polymer Sizing

Pozegic

Anguita

Hamerton

et al. 2016

Sci Rep

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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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“…Following the functionalisation procedure the I D /I G increased to 0.93±0.02, indicating an increased defect density in the CNT structure (Figure S2 & S3). Figure b concentrates on the D peak and G peak region before and after functionalisation, illustrating the increase in peak height and width for both peaks, again supporting the evidence for increased defect density . This is expected with increased defects acting to break the symmetry within this well‐developed hexagonal carbon sp 2 matrix.…”

Section: Resultsmentioning

confidence: 80%

“…The intensity ratio of the D peak compared to the G peak (I D /I G ) in the Raman spectra is a commonly used metric in CNT research, it is calculated to determine the relative quality of the CNTs . Prior to functionalisation an I D /I G of 0.35±0.01 was recorded, indicating high quality CNTs had been grown on the electrode areas, a result consistent with other PT‐CVD grown CNTs using similar interlayers and growth parameters . Moreover, the CNTs grown on this MEA device are of higher quality, for equivalent growth temperatures, compared to others who have used directly grown CNTs on MEA devices .…”

Section: Resultsmentioning

confidence: 99%

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Highly Sensitive Dopamine Detection Using a Bespoke Functionalised Carbon Nanotube Microelectrode Array

et al. 2017

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Understanding how the brain works requires developing advanced tools that allow measurement of bioelectrical and biochemical signals, including how they propagate between neurons. The introduction of nanomaterials as electrode materials has improved the impedance and sensitivity of microelectrode arrays (MEAs), allowing high quality recordings of single cells in situ using electrode diameters of ≤20 μm. MEAs also have the potential to measure electroactive biological molecules in situ, such as dopamine, a neurotransmitter in the nervous system. Thus, this work focused on fabricating a functionalised carbon nanotube (CNT)‐based MEA to demonstrate its potential for future measurement of small signals generated from excitable cells. To this end, the functionalised CNT MEA has recorded one of the lowest electrochemical interfacial impedances available in the literature, 2.8±0.2 kΩ, for an electrode of its geometric surface area. Electrochemical detection of dopamine revealed again one of the best sensitivity values per area available in the literature, 9.48 μA μM−1 mm−2. Additionally, a limit of detection of 7 nM was recorded for dopamine using the functionalised CNT MEA, with selectivity against common electrochemical interferents such as ascorbic acid. These results indicate improvement beyond currently available MEAs, along with the feasibility of using these devices for multi‐site detection of physiologically relevant electroactive biomolecules.

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Towards type-selective carbon nanotube growth at low substrate temperature via photo-thermal chemical vapour deposition

Cited by 20 publications

References 49 publications

Multi-Functional Carbon Fibre Composites using Carbon Nanotubes as an Alternative to Polymer Sizing

Multi-Functional Carbon Fibre Composites using Carbon Nanotubes as an Alternative to Polymer Sizing

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

Highly Sensitive Dopamine Detection Using a Bespoke Functionalised Carbon Nanotube Microelectrode Array

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