Synergistic effects between TiO<sub>2</sub>and carbon nanotubes (CNTs) in a TiO<sub>2</sub>/CNTs system under visible light irradiation

Wu, Chung‐Hsin; Kuo, Chao‐Yin; Chen, Shih-Ting

doi:10.1080/09593330.2013.774058

Cited by 50 publications

(17 citation statements)

References 25 publications

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“…In the TiO 2 coated nanotubes, calcined 500 and 1000ºC, these bands are considerably shifted to higher wave numbers, between 1342-1359 cm -1 and 1583-1594 cm -1 , respectively. In this case, the upshift of the D band is related to stress induced by the TiO 2 bonded to the surface of the MWCNT 35,36 and the upshift in the G band is due to the high interaction level between the TiO 2 and the MWCNT 37,38 . Figure 2 shows the X-ray diffractograms obtained from samples of TiO 2 coated MWCNT, calcined at 500 and 1000ºC.…”

Section: Resultsmentioning

confidence: 99%

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

2017

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In recent years, efforts in developing high strength-low density materials are increasing significantly. One of the promising materials to attend this demand is the carbon nanotube (CNT), to be used mainly as a reinforcing phase in lightweight metal matrix composites (MMC). In the present work, the sol-gel technique has been employed to obtain TiO 2 coating on the surface of commercial multiwall carbon nanotubes (MWCNT). The aim of such coating is to improve the thermal stability of MWCNT in oxidize environment, which is necessary in most of MMC processing routes. Calcination in inert atmosphere was performed in order to crystallize a stable coating phase. The hybrid CNT/TiO 2 nanocomposite was characterized by X-Ray Diffractometry (XRD), Raman spectroscopy, Thermogravimetry (TGA) and Field Emission Gun -Scanning Electron Microscopy (FEG-SEM). The coating structure was observed to change from anatase to rutile, as the calcination temperature increases from 500 to 1000ºC. Results from thermogravimetric analysis showed that the samples calcined at 1000 ºC were more resistant to oxidation at high temperatures.

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Section: Resultsmentioning

confidence: 99%

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

2017

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“…For example, the photoactivity of TiO 2 (under visible light) has been shown to enhance upon conjugation with CNTs or graphene, because of lowering of the bandgap energy. [73,170] Such enhancement is attributed to the synergy in electronic properties between titania and carbon nanostructures; e.g. small-sized TiO 2 particles on CNT surfaces reduce the electron-hole pair recombination rate and thus enhance the photoactivity.…”

Section: Transformationmentioning

confidence: 99%

“…small-sized TiO 2 particles on CNT surfaces reduce the electron-hole pair recombination rate and thus enhance the photoactivity. [73] Moreover, the high electron transport ability through hollow CNT structures and conductive graphene -e.g. photoactivity transfer from UV region to visible range -is also known to improve photodynamic activity.…”

Section: Transformationmentioning

confidence: 99%

“…and ligand-based metallic compounds (ferrocene). CMNHs can be synthesised following four key pathways -(i) filling the inner cavities of CNTs and fullerenes with MNMs using vapour deposition, [67] arc discharge, [68] thermal annealing [69] and wet chemical approach [70] ; (ii) attaching MNMs onto CNT surfaces functionalised with pyrene, porphyrin derivatives [71] and similar linking molecules [72] ; (iii) decorating CNM surfaces with MNMs by solgel, [73] hydrothermal [74] and aerosol-based processes [75] and (iv) in-situ growth of MNMs on CNM surfaces by electrochemical, [76] eletroless deposition [77] and redox reactions. [78] Combinations of graphitic and metallic nanostructures result in the emergence of unique and synergistic electrical, optical, mechanical, catalytic, sensing ability and magnetic properties, which can be utilised for applications in various fields; e.g.…”

Section: Carbon-metal Nanohybrids (Cmnhs)mentioning

confidence: 99%

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A critical review of nanohybrids: synthesis, applications and environmental implications

et al. 2014

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Environmental context. Recent developments in nanotechnology have focussed towards innovation and usage of multifunctional and superior hybrid nanomaterials. Possible exposure of these novel nanohybrids can lead to unpredicted environmental fate, transport, transformation and toxicity scenarios. Environmentally relevant emerging properties and potential environmental implications of these newer materials need to be systematically studied to prevent harmful effects towards the aquatic environment and ecology.Abstract. Nanomaterial synthesis and modification for applications have progressed to a great extent in the last decades. Manipulation of the physicochemical properties of a material at the nanoscale has been extensively performed to produce materials for novel applications. Controlling the size, shape, surface functionality, etc. has been key to successful implementation of nanomaterials in multidimensional usage for electronics, optics, biomedicine, drug delivery and green fuel technology. Recently, a focus has been on the conjugation of two or more nanomaterials to achieve increased multifunctionality as well as creating opportunities for next generation materials with enhanced performance. With incremental production and potential usage of such nanohybrids come the concerns about their ecological and environmental effects, which will be dictated by their not-yet-understood physicochemical properties. While environmental implication studies concerning the single materials are yet to give an integrated mechanistic understanding and predictability of their environmental fate and transport, the importance of studying the novel nanohybrids with their multidimensional and complex behaviour in environmental and biological exposure systems are immense. This article critically reviews the literature of nanohybrids and identifies potential environmental uncertainties of these emerging 'horizon materials'.

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“…Both bands are slightly shifted to larger wavenumbers, when comparing to Figure 7(a). According to the literature [41,42], upshift of the D band can be related to stresses induced by the presence of TiO 2 shell on the surface of the MWCNT core, and the upshift of the G band is due to a high-structural interaction (bonding) between the TiO 2 and the MWCNTs [43,44].…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

Core/Shell Structure of TiO₂‐Coated MWCNTs for Thermal Protection for High‐Temperature Processing of Metal Matrix Composites

Rodriguez

Travessa

2018

Advances in Materials Science and Engineering

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e production of metal matrix composites with elevated mechanical properties depends largely on the reinforcing phase properties. Due to the poor oxidation resistance of multiwalled carbon nanotubes (MWCNTs) as well as their high reactivity with molten metal, the processing conditions for the production of MWCNT-reinforced metal matrix composites may be an obstacle to their successful use as reinforcement. Coating MWCNTs with a ceramic material that acts as a thermal protection would be an alternative to improve oxidation stability. In this work, MWCNTs previously functionalized were coated with titanium dioxide (TiO 2 ) layers of different thicknesses, producing a core-shell structure. Heat treatments at three different temperatures (500°C, 750°C, and 1000°C) were performed on coated nanotubes in order to form a stable metal oxide structure. e MWCNT/TiO 2 hybrids produced were evaluated in terms of thermal stability. ermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (RS), and X-ray photoelectron spectroscopy (XPS) were performed in order to investigate TiO 2 -coated MWCNT structure and thermal stability under oxidative atmosphere. It was found that the thermal stability of the TiO 2 -coated MWCNTs was dependent of the TiO 2 layer morphology that in turn depends on the heat treatment temperature.

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Synergistic effects between TiO₂and carbon nanotubes (CNTs) in a TiO₂/CNTs system under visible light irradiation

Cited by 50 publications

References 25 publications

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

A critical review of nanohybrids: synthesis, applications and environmental implications

Core/Shell Structure of TiO₂‐Coated MWCNTs for Thermal Protection for High‐Temperature Processing of Metal Matrix Composites

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Synergistic effects between TiO2and carbon nanotubes (CNTs) in a TiO2/CNTs system under visible light irradiation

Cited by 50 publications

References 25 publications

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

A critical review of nanohybrids: synthesis, applications and environmental implications

Core/Shell Structure of TiO2‐Coated MWCNTs for Thermal Protection for High‐Temperature Processing of Metal Matrix Composites

Contact Info

Product

Resources

About

Synergistic effects between TiO₂and carbon nanotubes (CNTs) in a TiO₂/CNTs system under visible light irradiation

Core/Shell Structure of TiO₂‐Coated MWCNTs for Thermal Protection for High‐Temperature Processing of Metal Matrix Composites