An efficient method for the carboxylation of few-wall carbon nanotubes with little damage to their sidewalls

Martín, Olga; Gutiérrez, Humberto; Maroto-Valiente, A.; Terrones, Mauricio; Blanco, Tamara; Baselga, Juan

doi:10.1016/j.matchemphys.2013.03.060

Cited by 25 publications

(24 citation statements)

References 54 publications

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“…The intensity ratio I D /I G could be used to indicate the degree of crystallinity within sp 2 -hybridized carbon samples, that is, the smaller the number the more crystalline with fewer defects the sample becomes [39]. No significant variations in the spectral shape or Raman shifts were detected, in accordance with previous results [10], although a slight decrease in the I D /I G ratio was observed as CNTs get oxidized and Cu-NPs get anchored on the tube surfaces. These differences are within variations between different batches produced identically.…”

supporting

confidence: 89%

“…However, CNTs can be dispersed in water by a single step synthesis-functionalization with oxygen-derivatives [9]. In that case, oxygen-derivatives concentrate on the CNT surface and create the electrostatic stability required for creating a uniform colloidal dispersion [10]. Furthermore, the combination of two nanomaterials such as CNTs and Cu-NPs could result in a novel hybrid material useful in the fabrication of sensors or catalysts [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…As produced CNTs (COx) were then mixed with ethanol before the microwave treatment because it has been observed that the liquid reduces overheating (Joule effect). Subsequently, oxidized CNTs (oxdCOx) were prepared by a method reported in our previous publication by Martin et al [10]. In particular, UV radiation (at 254 nm) was applied to CNTs suspensions in water peroxide during 30 min.…”

Section: Introductionmentioning

confidence: 99%

“…8) revealed a decrease of the thermal stability of the oxidized sample (oxdCOx) when compared to the pristine nanotube sample [10]. In particular, the maximum oxidation rate for the COx sample appeared at 578°C whereas for the oxdCOx appeared at 550°C.…”

mentioning

confidence: 96%

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Carbon nanotube-Cu hybrids enhanced catalytic activity in aqueous media

González

Martín-Alberca

Montalvo

et al. 2014

Carbon

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In this work, we report the synthesis of a hybrid material, consisting of Cu nanoparticles (Cu-NPs) anchored on the surface of carbon nanotubes (CNTs), which is able to increase the catalytic behavior when compared to bare CuNPs. This enhanced activity was evalu-ated by the electrophoretic separation of three carbohydrates: sucrose, glucose and fruc-tose. CNTs were first synthesized in the presence of minute amounts of oxygen, oxidized using H 2 O 2 -UV radiation and then decorated with Cu-NPs. The resulting hybrid structure was confirmed and characterized by X-ray photoelectron spectroscopy, transmission elec-tron microscopy, high resolution transmission electron energydispersive X-ray spectros-copy, titration, thermogravimetric analysis, elemental analysis and Raman spectroscopy.

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supporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 96%

See 2 more Smart Citations

Carbon nanotube-Cu hybrids enhanced catalytic activity in aqueous media

González

Martín-Alberca

Montalvo

et al. 2014

Carbon

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“…21 In a typical experiment, 100 mL of H 2 O 2 (30% wt) was added to 1 g of CNT keeping the mixture in an ultrasonic bath for three minutes; then the mixture was exposed to UV light (Philips Lighting 250HPLN 250W) for 15 minutes stirring with a magnetic stirrer. The dispersion was filtered and washed three times with distilled water and finally dried under vacuum.…”

Section: Hybrid Composites Preparationmentioning

confidence: 99%

High porosity scaffold composites of graphene and carbon nanotubes as microwave absorbing materials

2016

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The design of microwave absorbing materials requires low reflection and high absorption of radiation simultaneously. Low reflection of electromagnetic waves can be achieved inducing porous faces which minimize the impedance mismatch. High absorption can be obtained by increasing the conductivity of the material. We report the preparation of highly porous scaffolds from a combination of graphene and carbon nanotubes. The bimodal porous structure was controlled making use of the surface properties of graphene oxide that are able to stabilize hexane droplets in aqueous dispersions of graphene oxide and carbon nanotubes. After hydrothermal and two step freeze-drying processes, macro-(220 microns) and mesoporous (10 microns) structures, due to hexane droplets and freeze drying, respectively, were obtained. DC conductivities of 8.2, 14.7, 33.2, and 60.7 S m 1 were obtained for graphene scaffolds containing 0, 10, 20 and 40% of carbon nanotubes respectively. An electromagnetic characterization was performed on scaffolds infiltrated with epoxy resin; using appropriate models, the electromagnetic properties of the conducting phase have been obtained. Scaffolds with a thickness of 9 mm were able to absorb up to 80% of the incident radiation keeping the reflection as low as 20%.

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Fabrication and Functionalisation of Nanocarbon‐Based Field‐Effect Transistor Biosensors

et al. 2022

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Nanocarbon-based field-effect transistor (NC-FET) biosensors are at the forefront of future diagnostic technology. By integrating biological molecules with electrically conducting carbon-based platforms, high sensitivity real-time multiplexed sensing is possible. Combined with their small footprint, portability, ease of use, and label-free sensing mechanisms, NC-FETs are prime candidates for the rapidly expanding areas of point-of-care testing, environmental monitoring and biosensing as a whole. In this review we provide an overview of the basic operational mechanisms behind NC-FETs, synthesis and fabrication of FET devices, and developments in functionalisation strategies for biosensing applications.

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An efficient method for the carboxylation of few-wall carbon nanotubes with little damage to their sidewalls

Cited by 25 publications

References 54 publications

Carbon nanotube-Cu hybrids enhanced catalytic activity in aqueous media

Carbon nanotube-Cu hybrids enhanced catalytic activity in aqueous media

High porosity scaffold composites of graphene and carbon nanotubes as microwave absorbing materials

Fabrication and Functionalisation of Nanocarbon‐Based Field‐Effect Transistor Biosensors

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