Low-temperature synthesis and electrical transport properties of W18O49 nanowires

Shu-lan, Shi; Xue, Xinyu; Feng, Ping; Liu, Yonggang; Zhao, Heng; Wang, Taihong

doi:10.1016/j.jcrysgro.2007.10.038

Cited by 57 publications

(48 citation statements)

References 28 publications

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“…[ 13 ] The lattice spacing of this plane is found to be about 0.380 nm, in agreement with the HRTEM observation result. These data indicate that the UTNBs grow along this direction, which is reasonable because {010} is the close-packed plane of monoclinic W 18 O 49 . The energy dispersive spectrometer (EDS) testing result [Supporting Information (SI), Figure S1] also prove that the stoichiometry of the fi nal product is about WO 2.73 (i.e., W 18 O 49 ).…”

Section: Highly Flexible Sub-1 Nm Tungsten Oxide Nanobelts As Effi CIsupporting

confidence: 52%

“…The powder X-ray diffraction (XRD) pattern ( Figure 2 a) best matches the monoclinic W 18 O 49 (JCPDS card NO: 05-0392) among the various tungsten oxide species. The strongest peak (at 2 θ = 23.3°) is best indexed as {010} according to JCPDS card NO: 05-0392.…”

Section: Highly Flexible Sub-1 Nm Tungsten Oxide Nanobelts As Effi CImentioning

confidence: 75%

“…The blue color of the UTNBs may originate from polaron hopping, to which intervalence charge transfer between these W 5+ and W 6+ states is believed to be closely linked. [ 18 ] Fourier transform infrared (FT-IR) spectrum was employed to analyze the surface property of the UTNBs. The peaks at 2920 cm −1 and 2846 cm −1 correspond to the CH 2 and CH 3 stretching vibrations and the peaks which appear at 1650-1450 cm −1 correspond to the N−H modes (seeing Supporting Information, Figure S2).…”

Section: Highly Flexible Sub-1 Nm Tungsten Oxide Nanobelts As Effi CImentioning

confidence: 99%

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Highly Flexible Sub‐1 nm Tungsten Oxide Nanobelts as Efficient Desulfurization Catalysts

Liu

et al. 2014

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Section: Highly Flexible Sub-1 Nm Tungsten Oxide Nanobelts As Effi CIsupporting

confidence: 52%

Section: Highly Flexible Sub-1 Nm Tungsten Oxide Nanobelts As Effi CImentioning

confidence: 75%

Section: Highly Flexible Sub-1 Nm Tungsten Oxide Nanobelts As Effi CImentioning

confidence: 99%

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Highly Flexible Sub‐1 nm Tungsten Oxide Nanobelts as Efficient Desulfurization Catalysts

Liu

et al. 2014

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“…Only few of these phases have been investigated at the nanoscale. Moreover, the synthesis of nanoneedles, nanowires and nanorods have been demonstrated [38,64,65]. …”

Section: Chemical Synthesis and Structural Properties Of Heavily--dopmentioning

confidence: 99%

Plasmonics in heavily-doped semiconductor nanocrystals

et al. 2013

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Abstract:Heavily--doped semiconductor nanocrystals characterized by a tunable plasmonic band have been gaining increasing attention recently. Herein, we introduce this type of materials focusing on their structural and photo--physical properties. Beside their continuous--wave plasmonic response, depicted both theoretically and experimentally, we also review recent results on their transient ultrafast response. This was successfully interpreted by adapting models of the ultrafast response of noble metal nanoparticles. IntroductionThe optical features exhibited by metallic nano--systems have been the subject of an intensive theoretical and experimental research, resulting in applications in several fields, from surface--enhanced spectroscopy, to biological and chemical nano--sensing [1]. Such developments are primarily due to the localized surface plasmon resonance (LSPR), which results in intense optical absorption and scattering as well as sub--wavelength localization of large electrical fields in the vicinity of the nano--object [2--10]. The plasmonic response of these metallic nanostructures is strongly dependent on the type of metal of which they are made, on the dielectric function of the surrounding medium, on the particle shape and, even if to a lesser extent, on the particle size. Nanoparticles of several metals, such as Ag, Au, Cu and Pt, exhibiting plasmonic response in the ultraviolet and in the visible regions of the spectrum have been successfully synthesized in the past decades [11--15]. Elongated metallic nanoparticles have been shown to exhibit plasmonic response in the near infrared, due to excitation of the longitudinal plasmon mode [16--18]. It has been recently reported that direct optical excitation of the metal by intense femtosecond laser pulses induces an ultra--fast modulation of the plasmonic resonance, which can be used for ultra--fast modulation of signals [19], paving the way to ultrafast active plasmonics. A quantitative investigation of such dynamical features is therefore crucial for the development of a new generation of ultra--fast nano--devices. Pump--probe spectroscopy, giving access to the electronic excitation and subsequent relaxation processes in the material, is to date the most suitable tool for the experimental study of the ultrafast dynamical features exhibited by plasmonic nanostructures. So far, several noble metal structures have been investigated, including spherical nanoparticles [20--22] and nanorods [23], revealing that the physical processes of excitation and relaxation are actually similar to those observed in bulk (i.e. in thin films) metallic systems, that are the electron--electron, the electron--phonon and the phonon--phonon interactions [24,25].

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“…[9] In addition, W 18 O 49 has excellent durability under an electrochemical environment. In previous work, we showed that Pt/W 18 O 49 preserves 87 % of its initial electrochemical surface area after an accelerated durability test (1 000 cycles between 0.6 and 1.3 V NHE ).…”

mentioning

confidence: 99%

Simple Synthesis of Platinum Dendritic Aggregates Supported on Conductive Tungsten Oxide Nanowires as High‐Performance Methanol Oxidation Electrocatalysts

Joo

Lim

et al. 2012

Chemistry A European J

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Platinum nanocrystals are key catalysts invaluable to many reactions involved in proton-exchange membrane (PEM) fuel cells, including the oxidation of small organic molecules, such as methanol, at the anode [1] and the reduction of oxygen molecules at the cathode.[2] Current advances in nanotechnology have allowed us to tune the morphology of nanocrystals, [3] which is crucial to maximize their activity, because morphology determines surface atomic arrangement as well as the number of atoms located at the corners or edges.[4] Recently, Pt nanocrystals with dendritic morphologies have attracted great interest for use as highly active electrocatalysts for PEM fuel-cell applications, because they provide a relatively large specific surface area and a high specific activity due to the presence of high densities of edges and corners on their structures. [5] In typical applications, Pt-based catalysts or electrocatalysts are used in the form of Pt nanocrystals supported on metal oxides [6] or carbonaceous materials [7] to achieve good dispersion of Pt nanocrystals and thus maximize the surface area available for catalytic or electrocatalytic reactions. Among various metal oxides or carbonaceous materials, tungsten oxides are of particular interest as supports for Pt nanocrystals owing to their synergistic effect in catalyzing the methanol oxidation reaction that occurs at the anode of direct methanol fuel cells. [8] It was shown that tungsten oxides facilitate not only the dehydrogenation of methanol by forming a hydrogen bronze, but also the oxidation of the CO ads species, which acts as a poison, due to the presence of hydroxyl groups (OH ads ) on the surface of tungsten ox-A C H T U N G T R E N N U N G ides.[8a] Typical tungsten oxides (WO 3 ), however, have relatively low surface areas and low electrical conductivity, which have been main limitations in developing a highly active catalytic system based on Pt nanocrystals supported on tungsten oxides for the methanol oxidation reaction.Recently, it was shown that W 18 O 49 nanowires have electrical conductivity as high as 4 S cm À1, which is attributed to the presence of W 5 + ions and the intervalence charge transfer between W 5 + and W 6 + ions. [9] In addition, W 18 O 49 has excellent durability under an electrochemical environment. In previous work, we showed that Pt/W 18 O 49 preserves 87 % of its initial electrochemical surface area after an accelerated durability test (1 000 cycles between 0.6 and 1.3 V NHE ).[10]Herein, we report a simple synthesis of new hybrid nanostructures consisting of dendritic Pt nanocrystals supported on W 18 O 49 nanowires. In this approach, Pt/W 18 O 49 hybrid nanostructures were generated by heating benzyl alcohol containing tungsten chloride and subsequent, repeated injection of ethylene glycol containing chloroplatinic acid, in which initially formed W 18 O 49 nanowires provide preferential sites for the nucleation and growth of Pt upon the reduction of chloroplatinic acid by ethylene glycol (Figure 1 A). The overall proced...

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Low-temperature synthesis and electrical transport properties of W18O49 nanowires

Cited by 57 publications

References 28 publications

Highly Flexible Sub‐1 nm Tungsten Oxide Nanobelts as Efficient Desulfurization Catalysts

Highly Flexible Sub‐1 nm Tungsten Oxide Nanobelts as Efficient Desulfurization Catalysts

Plasmonics in heavily-doped semiconductor nanocrystals

Simple Synthesis of Platinum Dendritic Aggregates Supported on Conductive Tungsten Oxide Nanowires as High‐Performance Methanol Oxidation Electrocatalysts

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