Preparation and characterisation of an aligned carbon nanotube array on the silicon (100) surface

Yu, Jingxian; Lošić, Dušan; Marshall, Matthew William; Böcking, Till; Gooding, J. Justin; Shapter, Joseph G.

doi:10.1039/b611016a

Cited by 53 publications

(77 citation statements)

References 40 publications

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“…41 This extra element of orientational control is governed by the hydrophilic nature of the hydroxylated substrate, which makes interactions with the hydrophobic side walls of the nanotubes very unfavourable. In the case of the SAM, the aliphatic section of the molecules seems to have given the surface enough hydrophobic character to allow sidewall interactions.…”

Section: Atomic Force and Scanning Electron Microscopymentioning

confidence: 99%

Direct attachment of well-aligned single-walled carbon nanotube architectures to silicon (100) surfaces: a simple approach for device assembly

Shapter

Quinton

et al. 2007

Phys. Chem. Chem. Phys.

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115

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A new approach for the attachment of vertically-aligned shortened carbon nanotube architectures to a silicon (100) substrate by chemical anchoring directly to the surface has been demonstrated for the first time. The ordered assembly of single-walled carbon nanotubes (SWCNTs) was accomplished by hydroxylating the silicon surface followed by a condensation reaction with carboxylic acid functionalised SWCNTs. This new nanostructure has been characterised by X-ray photoelectron, Raman and Fourier transform infrared (FTIR) spectroscopy as well as scanning electron and atomic force microscopy. The assembly behaviour of SWCNTs onto the silicon surface shows a fast initial step producing isolated functionalised carbon nanotubes or nanotube bundles anchored to the silicon surface followed by a slower step where the adsorbed nanotubes grow into larger aggregates via van der Waals interactions between adsorbed and solvated nanotubes. The electrochemical and optical properties of the SWCNTs directly attached to silicon have also been investigated. These new nanostructures are excellent electrochemical electrodes. They also fluoresce in the wavelength range 650-800 nm. The successful attachment of the SWCNTs directly to silicon provides a simple, new avenue for fabrication and development of silicon-based nanoelectronic, nano-optoelectronic and sensing devices. Compared to existing techniques, this new approach has several advantages including low operating temperature, low cost and the possibility of further modification.

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Section: Atomic Force and Scanning Electron Microscopymentioning

confidence: 99%

Direct attachment of well-aligned single-walled carbon nanotube architectures to silicon (100) surfaces: a simple approach for device assembly

Shapter

Quinton

et al. 2007

Phys. Chem. Chem. Phys.

Self Cite

115

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“…Carbon nanotube arrays were prepared by modifying an existing technique [18]. It is outlined here in brief.…”

Section: A Single Walled Carbon Nanotube Arraysmentioning

confidence: 99%

“…This can be elucidated by electrochemical impedance spectroscopy (EIS) [13][14][15]. The cell design shown in Figure 1 replaces the dye-sensitized TiO 2 with an array of vertically aligned SWCNT that is chemically attached to FTO coated glass by a technique previously performed extensively in our research group [16][17][18][19][20]. This array of SWCNT behaves as a semi-conductor due to chemical treatment and can generate electron-hole pairs when exposed to visible light.…”

Section: Introductionmentioning

confidence: 99%

Photocurrent Response from Vertically Aligned Single-Walled Carbon Nanotube Arrays

Bissett

Shapter

2010

J. Phys. Chem. C

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Abstract-Vertically-aligned arrays of single walled carbon nanotubes were created on an optically transparent electrode (FTO glass) these arrays were found to exhibit a prompt current and voltage when exposed to light. These cells were then investigated by electrochemical impedance spectroscopy and found to exhibit a dampening of the recombination reaction over the first 24 hours. Symmetrical cell modeling was successful in simulating the behavior of normal cell architecture.

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“…Stage iii: Attachment of the dispersed CNTs on the pre-treated surface Attachment of CNTs on the different surfaces by various methodologies was demonstrated in the literature [45,47,[67][68][69][70][71][72][73][74][75][76][77]. To bond CNTs to rock surface, CNTs are required to be functionalised by carboxylic groups to simplify the procedures.…”

Section: Stage Ii: Dispersion Of Cntsmentioning

confidence: 99%

“…To bond CNTs to rock surface, CNTs are required to be functionalised by carboxylic groups to simplify the procedures. COOH-CNTs are produced by acidifying the CNTs in the solution of sulphuric and nitric acids [69][70][71][72][73]. Carboxylic groups of CNTs react with amine groups of organosilane treated on the surface.…”

Section: Stage Ii: Dispersion Of Cntsmentioning

confidence: 99%

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Ghorbani¹,

Wilson²,

Kapur³

et al. 2014

SPE International Oilfield Scale Conference and Exhibition

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A new potential application of nanotechnology for mineral scale prevention in the oil and gas industry is presented. In current squeeze treatments, in which scale inhibitors are squeezed into wells to adsorb or precipitate onto rock surfaces for later release, a large proportion of the injected inhibitor does not adsorb and is therefore returned very quickly from the reservoir upon well re-start. Here it is demonstrated that nano-particles have the potential to enhance squeeze lifetime by greatly increasing the adsorption of inhibitors within the formation. An extensive literature review is presented, exploring the potential for using nano-scale materials in squeeze treatments. One of the observations from scale inhibitor squeezes into sandstone reservoirs is the apparent lack of suitable surfaces available for adsorption. The main constituent of sandstones, quartz, has a very low ability to adsorb inhibitor (1 mg/I). Given this, research using nanotechnology was targeted towards enhancing the available sites for scale inhibitor adsorption within the near wellbore. Specifically, research was undertaken to examine the potential benefits of using carbon nanotubes in a process called Nanotechnology Assisted Squeeze Treatment (NAST). The process involves carbon nanotubes adsorbing and permanently modifying the near wellbore with scale inhibitors subsequently adsorbing onto the nanotubes. This process was observed to be significantly higher than a non-modified near wellbore surface, with a maximum adsorption of more than 85 and 160mg/g onto the nanotubes in solution of distilled water (DW) and CaC12 in DW; respectively, compared to 1 mg/g directly onto the rock. Coreflood tests comparing the NAST procedure with a simplified standard coreflood show the potential for improvement of the squeeze lifetime. IntroductionInorganic scale precipitation, including formation of CaCO 3 , MgCO 3 , FeCO 3 , BaSO 4 , CaSO 4 , SrSO 4 , etc. occurs when two incompatible brines are mixed or where the conditions (i.e. temperature and pressure) in a system are changed and there is a resulting change in the solubility of certain salts. This can cause blockage of the oil path and damage to the production system. A chemical squeeze treatment is used to pump scale inhibitor (SI) downhole to adsorb or precipitate onto the formation rock. The aim is to establish a downhole reserve of SI from which subsequent desorption or release maintains a concentration of SI within the reservoir sufficient to prevent scale formation. The lifetime of the squeeze treatment is defined as the time when the return Scale Inhibitor (SI) concentration falls below the Minimum Inhibitor Concentration (MIC), which is typically 1-20 ppm depending on the reservoir conditions and SI properties. At this point the well needs to be re-squeezed. Regardless of whether the SI adsorbs or precipitates, the squeeze treatment process is expensive due to the squeeze implementation, chemical inhibitor costs and most importantly because of production losses/deferred during th...

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Preparation and characterisation of an aligned carbon nanotube array on the silicon (100) surface

Cited by 53 publications

References 40 publications

Direct attachment of well-aligned single-walled carbon nanotube architectures to silicon (100) surfaces: a simple approach for device assembly

Direct attachment of well-aligned single-walled carbon nanotube architectures to silicon (100) surfaces: a simple approach for device assembly

Photocurrent Response from Vertically Aligned Single-Walled Carbon Nanotube Arrays

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

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