Fabrication and Biosensing with CNT/Aligned Mesostructured Silica Core−Shell Nanowires

Zhang, Lei; Geng, Wang; Qiao, Shi Zhang; Zheng, Huajun; Lu, Gao Qing; Yan, Zi Feng

doi:10.1021/am100351k

Cited by 26 publications

(24 citation statements)

References 35 publications

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“…Another key effect could be due to the optical properties of SBA-15. Mesoporous silica films have been shown to have excellent scattering properties [ 54 ] and excellent antireflective properties when coated onto a substrate [ 55 ]. The CNTs have excellent optical absorption properties in the UV-vis region [ 74 – 76 ], and thus, any incident light on the CNTs will not reflect or scatter to possibly interact with the dispersed titania, and thus, those photons will not contribute to the generation of electron or holes.…”

Section: Resultsmentioning

confidence: 99%

Photo-Catalytic Properties of TiO2 Supported on MWCNTs, SBA-15 and Silica-Coated MWCNTs Nanocomposites

Ramoraswi

Ndungu

2015

Nanoscale Res Lett

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Mesoporous silica, specifically SBA-15, acid-treated multi-walled carbon nanotubes and a hybrid nanocomposite of SBA-15 coated onto the sidewalls acid-treated multi-walled carbon nanotubes (CNTs) were prepared and used as supports for anatase TiO2. Sol-gel methods were adapted for the synthesis of selected supports and for coating the materials with selected wt% loading of titania. Physical and chemical properties of the supports and catalyst composite materials were investigated by powder X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis, scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), UV-vis diffuse reflectance spectroscopy and fluorescence spectroscopy. The photo-activity of the catalyst composites were evaluated on the decolorisation of methylene blue as a model pollutant. Coating CNTs with SBA-15 improved the thermal stability and textural properties of the nanotubes. All supported titania composites had high surface areas (207–301 m2/g), altered band gap energies and reduced TiO2 crystallite sizes. The TiO2/SBA-CNT composite showed enhanced photo-catalytic properties and activity than the TiO2/SBA-15 and TiO2/CNT composites. In addition, an interesting observation was noted with the TiO2/SBA-15 nanocomposites, which had a significantly greater photo-catalytic activity than the TiO2/CNT nanocomposites in spite of the high electron-hole recombination phenomena observed with the photoluminescence results. Discussions in terms of morphological, textural and physical-chemical aspects to account for the result are presented.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-1137-3) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Photo-Catalytic Properties of TiO2 Supported on MWCNTs, SBA-15 and Silica-Coated MWCNTs Nanocomposites

Ramoraswi

Ndungu

2015

Nanoscale Res Lett

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“…As described previously, we noticed that the container wall was coated by silica during the preparation of spherical particles by the Stöber synthesis. Motivated by this observation, the application of the Stöber synthesis for the preparation of thin layer of silica‐surfactant mesostructured materials on functional powder was examined in addition to flat substrate coating . Photocatalytic reactions on titania particles were controlled by the mesoporous silica layer on the catalyst surface to be molecular recognitive photocatalysts .…”

Section: Deposition Of Mesoporous Silica On Nanostructured Solidsmentioning

confidence: 99%

“…Core‐shell structured mesoporous silicas have been used for drug delivery and cancer surgery . Semiconductor, metal and carbon were coated with mesoporous silica layer . The possible roles of mesoporous silica are to promote the adsorption (concentration) of target species and to prevent the aggregation and flocculation of the particles.…”

Section: Deposition Of Mesoporous Silica On Nanostructured Solidsmentioning

confidence: 99%

Mesoporous Silica Layer: Preparation and Opportunity

Ogawa

2016

The Chemical Record

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Periodic mesoporous silicas, which were prepared from silica-surfactant mesostructured materials, have been investigated for a wide range of application due to their very large surface area, high porosity, pore size uniformity and variation, periodic pore arrangement and possible pore surface modification, after the pioneering papers on the formation of mesoporous silicas (MCM-41 and FSM-16). Morphosyntheses from such macroscopic morphologies as bulk monolith and film to nanoscopic ones, nanoparticles and their stable suspension, make mesoporous materials more attractive for applications and detailed characterization. Mesoporous silicas have been studied initially for such applications as adsorbent and catalyst, and more recently, optical, electronic, and bio-related applications have been investigated. This review summarizes the studies on mesoporous silica film to highlight the present status and future of the preparation, characterization and application of the mesoporous silica film.

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“…21) with uniform meso-porous silica shell, perpendicularly aligned/orientated and accessible mesopores via the interfacial surfactant (octadecyltrimethylammo-nium bromide, ODTMA) template approach [127]. CNT@silica NWs shows including good dispersibility in aqueous solution, high adsorption capacity, biocompatibility, and facile functionalization without the disruption of the CNTs structure.…”

Section: Sensing Application Of Silica Nwsmentioning

confidence: 99%

“…e) Cyclic voltammograms of the DMSOR-CNTs/pyrolytic graphite electrode and (f) DMSOR-NWs/pyrolytic graphite electrode in 50 mM purged tris-buffle solution (pH 8.0) with 30 μM [Co(transdiammac)]3+ mediator in the (curve a) absence and (curve b) presence of 115 μM DMSO. Scan rate at 20 mV ·s −1 [127]. …”

Section: Figmentioning

confidence: 99%

Silica nanowires: Growth, integration, and sensing applications

et al. 2014

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This review (with 129 refs.) gives an overview on how the integration of silica nanowires (NWs) into micro-scale devices has resulted, in recent years, in simple yet robust nano-instrumentation with improved performance in targeted application areas such as sensing. This has been achieved by the use of appropriate techniques such as di-electrophoresis and direct vapor-liquid-growth phenomena, to restrict the growth of NWs to site-specific locations. This also has eliminated the need for post-growth processing and enables nanostructures to be placed on pre-patterned substrates. Various kinds of NWs have been investigated to determine how their physical and chemical properties can be tuned for integration into sensing structures. NWs integrated onto interdigitated micro-electrodes have been applied to the determination of gases and biomarkers. The technique of directly growing NWs eliminates the need for their physical transfer and thus preserves their structure and performance, and further reduces the costs of fabrication. The biocompatibility of NWs also has been studied with respect to possible biological applications. This review addresses the challenges in growth and integration of NWs to understand related mechanism on biological contact or gas exposure and sensing performance for personalized health and environmental monitoring.

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Fabrication and Biosensing with CNT/Aligned Mesostructured Silica Core−Shell Nanowires

Cited by 26 publications

References 35 publications

Photo-Catalytic Properties of TiO2 Supported on MWCNTs, SBA-15 and Silica-Coated MWCNTs Nanocomposites

Photo-Catalytic Properties of TiO2 Supported on MWCNTs, SBA-15 and Silica-Coated MWCNTs Nanocomposites

Mesoporous Silica Layer: Preparation and Opportunity

Silica nanowires: Growth, integration, and sensing applications

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