Simple Approaches to Quality Large-Scale Tungsten Oxide Nanoneedles

Jin, Yizheng; Zhu, Yan; Whitby, Raymond L. D.; Yao, Nan; Ma, Renzhi; Watts, Paul; Kroto, Harold W.; Walton, D. R. M.

doi:10.1021/jp048596q

Cited by 67 publications

(73 citation statements)

References 25 publications

(54 reference statements)

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“…The method used here is similar to that has been reported by Jin et al [20]. There they used tungsten particles with diameters 0.6-1 mm and synthesized W 18 O 49 nanoneedles with diameters 200-400 nm which have obvious dislocations at 800 1C.…”

Section: Methodsmentioning

confidence: 84%

Low-temperature synthesis and electrical transport properties of W18O49 nanowires

Shu-lan

Xue

Feng

et al. 2008

Journal of Crystal Growth

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Section: Methodsmentioning

confidence: 84%

Low-temperature synthesis and electrical transport properties of W18O49 nanowires

Shu-lan

Xue

Feng

et al. 2008

Journal of Crystal Growth

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“…29 Nanorod formation in sparse populations was also apparent and likened to the growth of vapor-deposited WO 3 nanorods/nanobelts at temperatures of 950-1000°C with pure tungsten filaments in air. 42 We believe that the limited nanorod formation was due to hot spots in the FTO substrate and that increased temperatures would enhance nanorod formation.…”

Section: Discussionmentioning

confidence: 96%

Synthesis and Characterization of Ultrathin WO₃ Nanodisks Utilizing Long-Chain Poly(ethylene glycol)

et al. 2006

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Metal oxide nanostructures hold great potential for photovoltaic (PV), photoelectrochemical (PEC), and photocatalytic applications. Whereas thin films of various materials of both nanoparticle and nanorod morphologies have been widely investigated, there have been few inquiries into nanodisk structures. Here, we report the synthesis of ultrathin WO 3 nanodisks using a wet chemical route with poly(ethylene glycol) (PEG) as a surface modulator. The reported nanodisk structure is based on the interaction of the nonionic 10000 g/mol PEG molecules with tungsten oxoanion precursors. The WO 3 nanostructures formed are dominated by very thin disks with dimensions on the nanometer to micrometer scale. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images reveal the structures to have dimensions on the order of 350-1000 nm in length, 200-750 nm in width, and 7-18 nm in thickness and possessing textured single-crystalline features. A number of analytical techniques were used to characterize the WO 3 nanodisks, including selected-area electron diffraction (SAED), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), Raman scattering spectroscopy, UV-visible spectrophotometry, and cyclic voltammetry (CV). The growth of the WO 3 nanodisks was inhibited in the [010] crystal direction, leading to ultrathin morphologies in the monoclinic crystal phase. The large flat surface area and high aspect ratio of the WO 3 nanodisks are potentially useful in PEC cells for hydrogen production via direct water splitting, as has been demonstrated in a preliminary experiment with external bias.

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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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Simple Approaches to Quality Large-Scale Tungsten Oxide Nanoneedles

Cited by 67 publications

References 25 publications

Low-temperature synthesis and electrical transport properties of W18O49 nanowires

Low-temperature synthesis and electrical transport properties of W18O49 nanowires

Synthesis and Characterization of Ultrathin WO₃ Nanodisks Utilizing Long-Chain Poly(ethylene glycol)

Plasmonics in heavily-doped semiconductor nanocrystals

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Simple Approaches to Quality Large-Scale Tungsten Oxide Nanoneedles

Cited by 67 publications

References 25 publications

Low-temperature synthesis and electrical transport properties of W18O49 nanowires

Low-temperature synthesis and electrical transport properties of W18O49 nanowires

Synthesis and Characterization of Ultrathin WO3 Nanodisks Utilizing Long-Chain Poly(ethylene glycol)

Plasmonics in heavily-doped semiconductor nanocrystals

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Synthesis and Characterization of Ultrathin WO₃ Nanodisks Utilizing Long-Chain Poly(ethylene glycol)