XPS study of the Cu@Cu2O core-shell nanoparticles
XPS study of the Cu@Cu2O core-shell nanoparticles
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DOI：
10.1016/j.apsusc.2008.08.110
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发表时间：
2008-12-30
影响因子：
6.7
通讯作者：
Lameii, M.
中科院分区：
文献类型：
--
作者：
Ghodselahi, T.;Vesaghi, M. A.;Lameii, M.
通过rf溅射和RF-PECVD共沉积，在a-C: H薄膜上制备了Cu@Cu2O核壳纳米粒子。生长出不同Cu浓度的样品和不同尺寸的Cu纳米颗粒。x射线光电子能谱（XPS）表征表明，当铜纳米颗粒暴露于空气中时，其表面发生氧化。结果表明，纳米颗粒的壳层以Cu2O相为主，CuO包覆薄层。表面等离子体共振（SPR）峰是铜核纳米粒子存在的标志。从这些核壳纳米粒子的XPS研究中获得了一些有趣的信息。由Cu 2p（3/2）主峰反褶积得到的CuO/Cu2O比值与Cu 2p（3/2）主峰与卫星峰强度比得到的CuO/Cu2O比值一致。XPS光谱的背景是铜离子和铜纳米粒子等离子体的散射光电子。我们观察到，在氧化铜中加入铜芯可以改善CO气体的吸收。(C) 2008 Elsevier b.v.版权所有
Cu@Cu2O core-shell nanoparticles on the a-C: H thin films are prepared by co-deposition of RF-Sputtering and RF-PECVD. The samples with different Cu concentration and Cu nanoparticle with different size are grown. X-ray photoelectron spectroscopy (XPS) characterization indicates that the surface of the Cu nanoparticles oxidizes when they are exposed to air. The results are indicative that the shell of nanoparticle is mainly Cu2O phase with CuO cover thin layer. Surface plasmon resonance (SPR) peak that is signature of the existence of the Cu core nanoparticles appears in visible spectra of these films. Several interesting information are obtained from XPS study of these core-shells nanoparticles. The CuO/Cu2O ratio that is obtained by deconvolution of Cu 2p(3/2) main peak and from intensity ratio of the main and satellite peak of Cu 2p(3/2) are consistent. Background of XPS spectra is assigned to the scattering photoelectrons from Cu ions and plasmon of Cu nanoparticles. We observed that Cu core addition to copper oxide improves absorption of CO gas. (C) 2008 Elsevier B. V. All rights reserved.