Growth behaviour and plasmon resonance properties of photocatalytically deposited Cu nanoparticles

Abstract

Cu nanoparticles (NPs) were deposited on UV-irradiated TiO(2) in an aqueous solution containing Cu(CH(3)COO)(2) and ethanol by a photocatalytic reaction. Cu NPs on TiO(2) exhibit an extinction (= absorption + scattering + reflection) peak due to localized surface plasmon resonance at around 600 nm initially. The density and size as well as the extinction of Cu NPs increase during the deposition, accompanied by a slight redshift of the peak. Eventually, TiO(2) is mostly covered with coalesced Cu NPs that exhibit a spectrum less characteristic of Cu NPs, but more characteristic of a Cu layer.

Photoelectrochemical Responses from Polymer-coated Plasmonic Copper Nanoparticles on TiO2

“…As a result, the initially colorless TiO 2 film turned gray and a broad extinction (= absorption + scattering) peak characteristic of LSPR 16 was observed at around 600 nm in the extinction spectrum ( Figure 1a . 16 The calculated extinction peaks at 620 nm (Figure 1c), supporting that the experimentally observed extinction peak is due to LSPR of Cu NPs. The broader peak of the experimentally observed spectrum than that of the calculated one is explained in terms of dispersion in the particle size.…”

“…Ag NPs, of which resonance wavelength largely varies as the particle size changes on TiO 2 , can be applied to multicolor photochromism. 6a,6b Since resonance wavelength of Cu NPs is less sensitive than that of Ag NPs to changes in the particle size, 16 monochromatic photochromism may be a potential application of Cu NPs.…”

“…In the present work, we deposit Cu NPs on TiO 2 by photocatalytic reactions 16 and coat the deposited NPs with poly(vinyl alcohol) (PVA) to mildly protect the NPs from extensive oxidation during photoelectrochemical processes. As a result, photoelectrochemical responses based on LSPR of Cu NPs are observed under visible light.…”

Plasmonic Photoelectrochemistry: Functional Materials Based on Photoinduced Reversible Redox Reactions of Metal Nanoparticles

“…Cu 37 and Au nanoparticles can also be applied to photochromism. Since the resonance wavelength of Cu nanoparticles is less dependent on their size, 50 the CuTiO 2 system would be suitable for single color photochromism, rather than multicolor photochromism. The same thing may hold for Au nanoparticles.…”

Reaction factors for photo-electrochemical deposition of metal silver on polypyrrole as conducting polymer

“…In order to control the structure of the composite formed by the simultaneous reactions of silver deposition and polymerization under UV irradiation, it is essential to reveal the role of UV light on silver deposition. Although electroless deposition of silver on conducting polymer without any special attention to a light condition [21] and silver deposition behaviour on inorganic oxide semiconductor under photo irradiation [22,23] were studied, deposition behavior of metal silver on conducting polymer under the photo irradiation is still unclear as well as the role of doping anion in conducting polymer upon silver deposition.…”