Pt‐Catalyzed Formation of Ni Nanoshells on Carbon Nanotubes

Grzelczak, Marek; Correa‐Duarte, Miguel A.; Salgueiriño, Verónica; Rodríguez‐González, Benito; Rivas, José; Liz‐Marzán, Luis M.

doi:10.1002/anie.200701671

Cited by 58 publications

(44 citation statements)

References 49 publications

(19 reference statements)

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“…[14] Firstly, CNTs were functionalized through wrapping with a positively charged polyelectrolyte; poly(allylamine hydrochloride) (PAH). This polyelectrolyte is the ''glue'' or linker by which negatively charged Pt nanoparticles can be connected to the surface of the CNTs.…”

Section: Resultsmentioning

confidence: 99%

“…By Fourier transform analysis, the following intershell and interplanar distances were determined: multiwalled nanotubes (MWNTs) 3.36 Å , Pt 2.19 Å , and Ni 2.03 Å and 1.72 Å , corroborating the envisaged structure of the CNT@Pt/ Ni/NiO nanocomposites. [14] CNT@Pt/Ni nanocomposites were exposed to an oxygen-rich environment during the magneticmaterial-deposition process (aqueous solution) promoting the formation of the chemically stable NiO outer layer around each Ni nanocrystal. [14,32] This surface-passivation process provides the samples with an additional surface stabilization and simultaneously protects the inner, metallic Ni from further oxidation.…”

Section: Resultsmentioning

confidence: 99%

“…We recently demonstrated that the direct reduction of nickel salt onto the surface of CNTs in the presence of Pt nanoparticles leads to very homogeneous nanowires of Ni/NiO. [14] The present work describes the magnetic properties of these nanometer-sized Ni/ NiO wires supported on CNT/Pt nanocomposites in detail.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

Salgueiriño

Correa‐Duarte

Bañobre‐López

et al. 2008

Adv Funct Materials

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Several nanometer‐scale technological applications rely on the promising scenario of highly anisotropic magnetic materials. Bearing this in mind, we have studied the structure, magnetic properties, and interfacial exchange anisotropy effects of unique wires of Ni/NiO synthesized using carbon nanotubes as substrates. Structural analyses of these nanocomposites in correlation with magnetic measurements show that the crystalline NiO outer shells cause an enhanced exchange bias, providing an extra source of anisotropy that leads to their magnetization stability. These Ni/NiO nanowires, with a spin‐glass‐like behavior and with their magnetic moments in a blocked state over a wide temperature range that includes room temperature, should therefore inspire further study concerning the applicability of anisotropic structures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

Salgueiriño

Correa‐Duarte

Bañobre‐López

et al. 2008

Adv Funct Materials

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“…[25,32] Correa-Duarte's group, Liz-Marzan's group, and Giersig's group have reported a series of excellent works and have successfully assembled silica-coated Au nanoparticles, [25] gold nanorods, [33] quantum dots, [34,35] magnetic nanoparticles, [36] and Pt nanoparticles onto CNTs. [37] Vinodgopal and co-workers [38] have used a similar method to prepare highly dispersed Pt catalysts on single-walled carbon nanotubes; the as-made electrocatalysts had high activities toward oxygen reduction and methanol oxidation. Our groups have reported that silica-coated Prussian blue nanoparticles could be assembled onto CNTs via the electrostatic assembly method: the obtained Prussian blue nanoparticles on CNTs retained their intrinsic electrochemical properties and high electrocatalytic activity towards hydrogen peroxide.…”

mentioning

confidence: 98%

Carbon Nanotubes Decorated with Pt Nanocubes by a Noncovalent Functionalization Method and Their Role in Oxygen Reduction

Yang¹,

Wang²,

Yang³

et al. 2008

Advanced Materials

128

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“…At the stage of synthesis of nanocomposites by sol-gel method nanoparticles of metal oxides can be obtained and implanted into previously prepared organic polymers (see, for example, [88][89][90][91]). As the composites obtained in other ways, these nanocomposites are classified by the nature of interaction between organic and inorganic phases: nanocomposites with interphase covalent bond [92][93][94] and nanocomposites with weak (for example, hydrogen) bonds between the phases [95][96][97]. There are quite many examples in which these types of nanocomposites are described and characterized, we shall confine just to some of them [98][99][100][101][102][103][104][105][106][107][108][109][110].…”

Section: Formation Of Inorganic Precursor In Presence Of Organic Polymentioning

confidence: 99%

Physics and Chemistry of Sol-Gel Nanocomposites Formation

Pomogailo

Джардималиева

2014

Nanostructured Materials Preparation via Condensation Ways

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This method called sol-gel or dip-and spin-on-glass process, spin-spray-coating, sol -gel glasses, which was widely used in the second half of the twentieth century [1] 1 is one of the most universal condensation ways of production of nanoparticles stabilized by inorganic oxide or polymeric matrices. A special interest is attracted to materials obtained by combination of sol-gel chemistry and aerosol or spray processes, and combination of sol-gel synthesis with intercalation. This also includes combinations of sol-gel processes with different types of thermolysis, and approaches met in nature in biomineralization processes, etc., which are new aspects of integrative chemistry approach. Traditional sol-gel concept is based on hydrolysis and condensation of metal alkoxides and many metalloids including different ways of their modification [2,3]. Main reactions proceed at relatively low temperatures with usage of prepared in advance or synthesized in parallel polymers, and are convenient techniques for preparation of organic-inorganic nanocomposites compared with commercial silicate-intercalation technique. Sizes of formed nanoparticles in a composite can be reduced to 10 nm by choice of relative conditions. Polymer-inorganic materials have high mechanical strength and thermal stability in combination with optimal heat transport properties. They are widely used in practice due to unique physical and chemical properties: incorporation of nanometric inorganic component into polymeric matrix improves mechanical properties of material [4][5][6][7], permeability of polymers [8]. Light-sensitive materials are used in optic and electronic industry, printed-circuit boards, photoconductive cells, as key elements in solid coatings, packing materials, as cover materials they have good transparency [9][10][11]. For example, sol-gel method was used to produce various polymer/TiO 2 composites with high refractive index [12]. Such type of composites are used for chromatographic carriers, membrane materials, these are the main class of plastics for different applications, including airspace. Controlled properties of the surface of these colloid 1 We refer here to the recent review devoted to celebration of 40th anniversary of innovation researches in polymer-inorganic ceramics produced by sol-gel technique [1].

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Pt‐Catalyzed Formation of Ni Nanoshells on Carbon Nanotubes

Cited by 58 publications

References 49 publications

Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

Carbon Nanotubes Decorated with Pt Nanocubes by a Noncovalent Functionalization Method and Their Role in Oxygen Reduction

Physics and Chemistry of Sol-Gel Nanocomposites Formation

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