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首页> 外文期刊>Chemistry: A European journal >Surfactant-Assisted Hollowing of Cu Nanoparticles Involving Halide-Induced Corrosion-Oxidation Processes
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Surfactant-Assisted Hollowing of Cu Nanoparticles Involving Halide-Induced Corrosion-Oxidation Processes

机译：表面活性剂辅助的涉及卤化物诱导的腐蚀氧化过程的铜纳米粒子的空洞化

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摘要

We have demonstrated a simple fabrication of hollow nanoparticles by halide-induced corrosion oxidation with the aid of surfactants.Cuprous oxide Cu_2O nanoshells can be generated by simply mixing Cu nanoparticles with alkyltrimethylammonium hal-ides at 55 deg C for 16 min.The hollowing mechanism proposed is that absorption of surfactants onto the Cu surface facilitates the formation of the void interior through an oxidative etching process.Upon extending the reaction up to 4 h,fragmentation,oxidation,and self-assembly were observed and the CuO ellipsoidal structures were formed.The headgroup lengths of the surfactants influenced the degree of CuO ellipsoidal formation,whereby longer surfactants favored the generation of ellipsoids.Optical absorption measured by UV-visible spectroscopy was used to monitor both oxidation courses of Cu->Cu_2O and Cu_2O->CuO and to determine the band-gap energies as 2.4 eV for Cu_2O nanoshells and 1.89 eV for CuO ellipsoids.For the contact-angle measurements,the wettability changed from hydrophihcity(18 deg )to hydrophobicity(140 deg )as the Cu_2O nanoshells shifted to CuO ellipsoids.
机译：我们已经证明了在表面活性剂的帮助下通过卤化物诱导的腐蚀氧化可以简单地制备空心纳米颗粒。只需将Cu纳米颗粒与烷基三甲基卤化铵在55摄氏度下混合16分钟，即可生成氧化铜Cu_2O纳米壳。这是因为表面活性剂在铜表面的吸收促进了通过氧化刻蚀过程形成空隙内部。将反应延长至4小时后，观察到了碎片，氧化和自组装现象，并形成了CuO椭圆形结构。表面活性剂的头基长度影响了CuO椭圆形的形成程度，从而更长的表面活性剂有利于椭圆形的生成。采用紫外可见光谱法测量光吸收率，监测Cu-> Cu_2O和Cu_2O-> CuO的氧化过程并确定Cu_2O纳米壳的带隙能为2.4 eV，CuO椭球的带隙能为1.89 eV。 nts，随着Cu_2O纳米壳向CuO椭球体的转移，润湿性从疏水性（18度）变为疏水性（140度）。

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