Electrodeposition of Noble Metal Nanoparticles on Carbon Nanotubes

Quinn, Bernadette M.; Dekker, Cees; Lemay, Serge G.

doi:10.1021/ja0508828

Cited by 399 publications

(276 citation statements)

References 22 publications

(21 reference statements)

Supporting

Mentioning

265

Contrasting

Unclassified

Order By: Relevance

“…Understanding heterogeneous electron transfer (HET) at CNTs is of considerable importance, due to the wide range of electroanalytical and electrocatalytic systems based on CNTs (14)(15)(16)(17), and also because electrochemistry provides an attractive route to functionalize and tailor the properties of CNTs (18)(19)(20). Probing HET in 1D electrode materials is interesting fundamentally, given their inherent electronic structure and properties (21,22).…”

mentioning

confidence: 99%

Quantitative nanoscale visualization of heterogeneous electron transfer rates in 2D carbon nanotube networks

Güell¹,

Ebejer²,

Snowden³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

113

View full text Add to dashboard Cite

Carbon nanotubes have attracted considerable interest for electrochemical, electrocatalytic, and sensing applications, yet there remains uncertainty concerning the intrinsic electrochemical (EC) activity. In this study, we use scanning electrochemical cell microscopy (SECCM) to determine local heterogeneous electron transfer (HET) kinetics in a random 2D network of single-walled carbon nanotubes (SWNTs) on an Si∕SiO 2 substrate. The high spatial resolution of SECCM, which employs a mobile nanoscale EC cell as a probe for imaging, enables us to sample the responses of individual portions of a wide range of SWNTs within this complex arrangement. Using two redox processes, the oxidation of ferrocenylmethyl trimethylammonium and the reduction of ruthenium (III) hexaamine, we have obtained conclusive evidence for the high intrinsic EC activity of the sidewalls of the large majority of SWNTs in networks. Moreover, we show that the ends of SWNTs and the points where two SWNTs cross do not show appreciably different HET kinetics relative to the sidewall. Using finite element method modeling, we deduce standard rate constants for the two redox couples and demonstrate that HET based solely on characteristic defects in the SWNT side wall is highly unlikely. This is further confirmed by the analysis of individual line profiles taken as the SECCM probe scans over an SWNT. More generally, the studies herein demonstrate SECCM to be a powerful and versatile method for activity mapping of complex electrode materials under conditions of high mass transport, where kinetic assignments can be made with confidence.W ithin the family of nanostructured materials, carbon nanotubes (CNTs) have attracted particular attention because they are readily synthesised at low cost, have exceptional electronic properties, exhibit chemical and mechanical stability, and are amenable to a wide range of simple chemical functionalization routes (1-3). These characteristics have led to CNTs being considered ideal substrates for electronics (4), sensing systems (5, 6), electrocatalytic supports (7), and batteries (8). Furthermore, the different configurations in which CNTs can be arranged broaden their versatility and allow custom design of devices for specific applications. Individual single-walled carbon nanotubes (SWNTs) (9), 2D networks (10-12), and 3D nanostructures (13) have all been employed successfully.Understanding heterogeneous electron transfer (HET) at CNTs is of considerable importance, due to the wide range of electroanalytical and electrocatalytic systems based on CNTs (14-17), and also because electrochemistry provides an attractive route to functionalize and tailor the properties of . Probing HET in 1D electrode materials is interesting fundamentally, given their inherent electronic structure and properties (21,22). However, as we highlight herein, despite many studies aimed at characterizing HET at CNTs, substantial questions remain unanswered, such as the location and rate of HET.A popular approach for studying electrochemistry at CNT...

show abstract

mentioning

confidence: 99%

Quantitative nanoscale visualization of heterogeneous electron transfer rates in 2D carbon nanotube networks

Güell¹,

Ebejer²,

Snowden³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

113

View full text Add to dashboard Cite

show abstract

“…Examples include electrochemical deposition [26] electroless deposition with and without the aid of reducing agents [27,28] and physical/chemical deposition on CNTs with and without surface activation [29]. Among them, the electroless deposition is of particular interest because its simplicity could facilitate a large-scale production of the nanotube-nanoparticle hybrids.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of multi-walled carbon nanotube/silver nanocomposite powders by chemical reduction in aqueous solution

Daoush

Hong

2013

Journal of Experimental Nanoscience

View full text Add to dashboard Cite

Carbon nanotube (CNT)/silver nanocomposite powders with different volume fractions of CNTs 2.5, 5 and 10 vol.% were prepared by chemical reduction in solution. Multi-walled CNTs underwent surface modifications for functionalisations by acid treatments. The acid-treated CNTs were investigated by FT-IR and X-ray photoelectron spectroscopy. The spectroscopic investigations of the acid-functionalised CNTs detected that several kinds of functional groups attached with the graphene structure as well as produced short and de-caped CNTs. Acidic stannous chloride solution was used to sensitise the surface of the functionalised CNTs. Silver was deposited on the surface of sensitised CNTs with chemical reduction reaction of alkaline silver nitrate solution by formaldehyde at room temperature and pH � 9. The morphology of the produced CNT/silver nanocomposite powder was investigated by high-resolution SEM and TEM. It was observed that the produced CNT/silver nanocomposite powders have decorated type of spherical silver particle size 2-5 nm deposited on the surface of CNTs as well as the CNTs were implanted in large spherical silver nanoparticles of particle size �200 nm. The chemical analysis of the produced powder indicates that some oxygen content is included in the prepared powders which can be reduced by heat treatment at temperatures between 300 � C and 400 � C under hydrogen atmosphere.

show abstract

“…The modification of the surface of silica nanoparticles with methyl methacrylate by UV-induced graft polymerisation has also been studied [4]. Nanopowders can be prepared by a variety of methods including chemical and physical processes such as sol-gel reaction [5], chemical reduction [6], high-energy ball milling [7], electrodeposition [8], laser ablation [9], chemical vapour deposition and sputtering deposition [10,11]. Ball milling or mechanical attrition have been applied for nanopowders production.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of silica nanopowders in microwave plasma

Chau

Yang

2012

Journal of Experimental Nanoscience

View full text Add to dashboard Cite

In this work, surface modification of nanopowders in microwave plasma process was demonstrated. In order to obtain silica nanopowder with polymeric coating, a two-step microwave process was designed. 3-Aminopropyltrimethoxysilane was used as the surface modifier. Transmission electron microscopy and electron energy loss spectroscopy have been used for the direct microstructural imaging and chemical analysis of surface modified-silica nanopowders. The silica nanopowders were uniformly coated with a thick layer of aminosilane. Surface modification in microwave plasma is a simple, direct and easy to control process without using any solvents. The surface modified-silica nanopowders can be incorporated directly into polymer matrix for the preparation of hybrid nanocomposite materials.

show abstract

Electrodeposition of Noble Metal Nanoparticles on Carbon Nanotubes

Abstract: Noble metal nanoparticles can be electrodeposited on carbon nanotubes under potential control. The nanotube sidewalls serve both as the electrodeposition template and as the wire electrically connecting the deposited nanoparticles.

Cited by 399 publications

References 22 publications

Quantitative nanoscale visualization of heterogeneous electron transfer rates in 2D carbon nanotube networks

Quantitative nanoscale visualization of heterogeneous electron transfer rates in 2D carbon nanotube networks

Synthesis of multi-walled carbon nanotube/silver nanocomposite powders by chemical reduction in aqueous solution

Surface modification of silica nanopowders in microwave plasma

Contact Info

Product

Resources

About