Dealloying Derived Synthesis of W Nanopetal Films and Their Transformation into WO<sub>3</sub>

Liu, Zhifu; Yamazaki, Toshinari; Shen, Yanbai; Meng, Dan; Kikuta, Toshio; Nakatani, N.; Kawabata, Tokimasa

doi:10.1021/jp709659r

Cited by 42 publications

(30 citation statements)

References 29 publications

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“…The dealloying mechanism involves a phase separation at the solid-liquid interface, with the dissolution of a species. 34,35 It is an inexpensive route to porous metals, and can be tailored to provide a desired product. The best known example of selective leaching is the preparation of RANEYÒ nickel catalysts, which occurs by the leaching of aluminium from Ni-Al alloys.…”

Section: Dealloying Of Metalsmentioning

confidence: 99%

Spontaneously formed porous and composite materials

et al. 2010

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In recent years, a number of routes to porous materials have been developed which do not involve the use of pre-formed templates or structure-directing agents. These routes are usually spontaneous, meaning they are thermodynamically downhill. Kinetic control, deriving from slow diffusion of certain species in the solid state, allows metastable porous morphologies rather than dense materials to be obtained. While the porous structures so formed are random, the average architectural features can be well-defined, and the porosity is usually highly interconnected. The routes are applicable to a broad range of functional inorganic materials. Consequently, the porous architectures have uses in energy transduction and storage, chemical sensing, catalysis, and photoelectrochemistry. This is in addition to more straightforward uses deriving from the pore structure, such as in filtration, as a structural material, or as a cell-growth scaffold. In this feature article, some of the methods for the creation of porous materials are described, including shape-conserving routes that lead to hierarchical macro/ mesoporous architectures. In some of the preparations, the resulting mesopores are aligned locally with certain crystallographic directions. The coupling between morphology and crystallography provides a macroscopic handle on nanoscale structure. Extension of these routes to create biphasic composite materials are also described.

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Section: Dealloying Of Metalsmentioning

confidence: 99%

Spontaneously formed porous and composite materials

et al. 2010

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“…Recently, a number of nanoporous metals, including gold, nickel, tungsten, platinum, palladium, and copper, have been synthesized by chemical or electrochemical dealloying. [1][2][3][4][5][6] For nanoporous copper (NPC), a variety of dealloying methods have been reported. For examples, nanoporous Raney copper has been synthesized by dealloying CuAl 2 and other copper-based alloys in NaOH electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Copper with Tunable Nanoporosity for SERS Applications

Chen

Fujita

et al. 2009

Adv Funct Materials

354

271

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Nanostructured materials with designable microstructure and controllable physical and chemical properties are highly desired for practical applications in nanotechnology. In this article, it is reported that nanoporous copper with a tunable nanopore size can be fabricated by controlling the dealloying process. The influence of acid concentration and etching potential on the formation of nanoprosity is systematically investigated. With optimal etching conditions, the nanopore sizes can be tailored from ∼15 to ∼120 nm by controlling the dealloying time. It is found that the tunable nanoporosity leads to significant improvements in surface‐enhanced Raman scattering (SERS) of nanoporous copper and peak values of SERS enhancements for both rhodamine 6G and crystal violet 10B molecules are observed at a pore size of ∼30–50 nm. This study underscores the effect of complex three‐dimensional nanostructures on physical and chemical properties and is helpful in developing inexpensive SERS substrates for sensitive instrumentations in molecular diagnostics.

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“…The strain in the WO 3 layer grows with its increasing thickness, because of the lattice mismatch between the crystallized WO 3 layer and Si substrate, and the volume shrinkage. 27 As a result, cracks appear in the WO 3 layer and some sections of the WO 3 layer separate from the substrate layer. With the time proceeding, WO 3 is partially reduced by sulfur vapor to form volatile suboxide species WO 3-x , which would be further sulfurized, leading to the formation of small WS 2 nanoplates.…”

Section: Growth Mechanism Of Ws 2 Nanoplatesmentioning

confidence: 99%

Bulk Fabrication of WS₂ Nanoplates: Investigation on the Morphology Evolution and Electrochemical Performance

Qian

Peng

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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Two-dimensional layered chalcogenide WS2, similar to graphene, is considered to be very interesting for materials scientists. However, to make it a useful material platform, it is necessary to develop sophisticated synthesis methods to control its morphology. In this paper, we present a simple approach to prepare various morphologies of WS2 nanostructures by direct thermal evaporation of WO3 and S powders onto Si substrates sputtered with W film without using any nanostructured W-contained precursors and highly toxic sulfide gases. This method can produce bulk quantities of pure hexagonal, horizontally grown WS2 nanoplates, vertically grown nanoplates, and nanoplate-formed flowers simply by tuning the distance between the substrate and source powders. The synthesis mechanism and morphology evolution model were proposed. Moreover, when employed as a thin-film anode material, the Li-ion battery with as-prepared, vertically grown WS2 nanoplates presented a rechargeable performance between 3 and 0.01 V with a discharge capacity of about 773 mAh/cm(3) after recycling three times, much better than its already-reported counterparts with randomly distributed WS2 nanosheet electrodes, but the battery with horizontally grown WS2 nanoplates could not show any charge-discharge cycling property, which could be attributed to the different structures of WS2 anodes for Li(+) ion intercalation or deintercalation.

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Dealloying Derived Synthesis of W Nanopetal Films and Their Transformation into WO₃

Cited by 42 publications

References 29 publications

Spontaneously formed porous and composite materials

Spontaneously formed porous and composite materials

Nanoporous Copper with Tunable Nanoporosity for SERS Applications

Bulk Fabrication of WS₂ Nanoplates: Investigation on the Morphology Evolution and Electrochemical Performance

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Dealloying Derived Synthesis of W Nanopetal Films and Their Transformation into WO3

Cited by 42 publications

References 29 publications

Spontaneously formed porous and composite materials

Spontaneously formed porous and composite materials

Nanoporous Copper with Tunable Nanoporosity for SERS Applications

Bulk Fabrication of WS2 Nanoplates: Investigation on the Morphology Evolution and Electrochemical Performance

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Product

Resources

About

Dealloying Derived Synthesis of W Nanopetal Films and Their Transformation into WO₃

Bulk Fabrication of WS₂ Nanoplates: Investigation on the Morphology Evolution and Electrochemical Performance