Controlled Electrodeposition of Nanoparticulate Tungsten Oxide

Controlled Electrodeposition of Nanoparticulate Tungsten Oxide

Nanoparticulate tungsten oxide films were synthesized by pulsed electrodeposition. Particle sizes between 45 and ∼330 nm were achieved by varying pulse duration from 5 to 500 ms. Shorter pulses increased the rate of new particle nucleation above the rate of existing particle growth, allowing for the...

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Veröffentlicht in:Nano letters 2002-08, Vol.2 (8), p.831-834
Hauptverfasser: Baeck, S. H, Jaramillo, T, Stucky, G. D, McFarland, E. W
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Jaramillo, T
Stucky, G. D
McFarland, E. W
description Nanoparticulate tungsten oxide films were synthesized by pulsed electrodeposition. Particle sizes between 45 and ∼330 nm were achieved by varying pulse duration from 5 to 500 ms. Shorter pulses increased the rate of new particle nucleation above the rate of existing particle growth, allowing for the observed variations in size. Cathodic deposition voltage (−1 ∼ −3 V) had little effect on particle size. Compared to films prepared by continuous electrodeposition, nanoparticulate tungsten oxide films showed a higher photoactivity and greater current density for the hydrogen intercalation reaction. Functional improvements are explained by the smaller particle size and larger surface area of nanocrystalline tungsten oxide.
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