High Quality Carbon Nanotubes on Conductive Substrates Grown at Low Temperatures

Ahmad, Muhammad; Anguita, José V.; Stolojan, Vlad; Corless, Tony; Chen, Jeng-Shiung; Carey, J. D.; Silva, S. Ravi P.

doi:10.1002/adfm.201501214

Cited by 39 publications

(60 citation statements)

References 59 publications

(107 reference statements)

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“…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%

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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Section: Resultsmentioning

confidence: 99%

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

et al. 2017

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“…[26][27][28] Materials that feature a high density of sp 2 carbon and minimal sp 3 are typically conductive. [ 29,30 ] To serve as the gate dielectric in OTFTs with a solution-processed organic semiconductor, the surface wetting property of the PLC fi lm was also evaluated. The PLC fi lm is hydrophobic with a contact angle against water of 101°, but has perfect wettability against typical organic solvent chlorobenzene with a contact angle of 3°, as shown in Figure S2 in the Supporting Information.…”

Section: Doi: 101002/aelm201500374mentioning

confidence: 99%

Room Temperature Grown High‐Quality Polymer‐Like Carbon Gate Dielectric for Organic Thin‐Film Transistors

Feng

Anguita

Tang

et al. 2016

Adv Elect Materials

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from the plasma decomposition of hydrocarbons are known to produce temperature stable materials even when grown at room temperature [ 18 ] which compares to equivalent siliconceramic materials deposited from silane precursors, which require signifi cantly higher deposition temperatures. It is believed that when using hydrocarbons, the plasma is able to provide the carbon radicals with suffi cient electronic excitation energy, to allow the growth of high quality material despite the use of signifi cantly lower growth temperatures, [ 19 ] such as room temperature in this study. The materials formed are stable, and offer functionalities that have wide applicability. In this work, we use this ability to prove the deposition of PLC dielectric fi lms with suffi ciently low defect densities that enable their use for high-quality and electronic-grade gate dielectric layers, even when deposited at room temperature. This low-cost and toxicfree PLC material shows outstanding surface and electrical characteristics, highly suitable for electronic devices. We report for the fi rst time PLC material used as the gate dielectric layer in OTFTs with solution-processed organic semiconductor. The fabricated bottom-gate bottom-contact OTFTs with PLC dielectric present promising overall performance. The capability of PLC for room temperature deposition by well-established and industry-standard PECVD techniques renders it a highly promising gate dielectric material for wide implementation in plastic electronics.The schematic diagram of the PECVD process for PLC dielectric is shown in Figure 1 ; a water-cooling system was used to maintain the substrate at room temperature. We have considered both physical and chemical effects from the plasma on the dielectric, in order to determine the conditions for minimal plasma damage. From a physical perspective, we minimize ion-induced damage by placing the substrates on the earthed electrode of a capacitively coupled RF plasma. We also operate in a relatively high-pressure regime of 900 mTorr, where the mean free path (<<1 mm) is signifi cantly shorter than the electrode separation (8 cm).

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“…With the increasing demand of conductive powders in the realms of electronics, aviation, military and others [1][2][3][4][5], the traditionally conductive materials--metallic powders and fibers [6]--are highly attractive in the development of material fields.…”

Section: Introductionmentioning

confidence: 99%

Synchronous achievement on preparation and modification of BaTiO3 conductive powders through Sm gaseous penetration to gel precursors

et al. 2016

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High Quality Carbon Nanotubes on Conductive Substrates Grown at Low Temperatures

Cited by 39 publications

References 59 publications

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

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

Room Temperature Grown High‐Quality Polymer‐Like Carbon Gate Dielectric for Organic Thin‐Film Transistors

Synchronous achievement on preparation and modification of BaTiO3 conductive powders through Sm gaseous penetration to gel precursors

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