A surfactant free synthesis and formation mechanism of hollow Cu2O nanocubes using Cl− ions as the morphology regulator
A surfactant free synthesis and formation mechanism of hollow Cu2O nanocubes using Cl− ions as the morphology regulator
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DOI：
10.1039/c5ra08988c
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发表时间：
2015-07
期刊：
影响因子：
3.9
通讯作者：
Qiuxiang Wang;Q. Kuang;Kun Wang;Xue Wang;Zhaoxiong Xie
中科院分区：
文献类型：
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作者：
Qiuxiang Wang;Q. Kuang;Kun Wang;Xue Wang;Zhaoxiong Xie
空心纳米材料因其特殊的结构和在许多领域的潜在应用而引起了人们的广泛关注。在本文中，我们报道了在室温下使用 Cl− 离子作为形貌调节剂还原 Cu2+ 前体，无表面活性剂合成空心 Cu2O 纳米立方体。研究发现，在 Cl− 离子存在下，通过用抗坏血酸直接还原 Cu2+ 前驱体可以很容易地合成空心 Cu2O 纳米立方体。通过精心设计的实验，我们提出，在这种无表面活性剂的合成路线中，空心 Cu2O 纳米立方体的形成是由于反应激活立方 CuCl 中间体的柯肯德尔扩散过程而形成的，这些中间体在反应过程中形成并充当自牺牲模板。 Cl−离子和NaOH的量是决定空心Cu2O纳米立方体是否形成的两个关键因素。
Hollow nanomaterials have attracted intense attention due to their special structures and potential applications in many fields. In this paper, we report a surfactant free synthesis of hollow Cu2O nanocubes by reducing Cu2+ precursors using Cl− ions as the morphology regulator at room temperature. It is found that in the presence of Cl− ions, hollow Cu2O nanocubes can be easily synthesized by directly reducing Cu2+ precursors with ascorbic acid. Through well-designed experiments, we propose that, in this surfactant free synthetic route, the formation of hollow Cu2O nanocubes results from a reaction activated Kirkendall diffusion process of cubic CuCl intermediates, which are formed in the reaction process and act as self-sacrificial templates. The amounts of Cl− ions and NaOH are two key factors to determine whether hollow Cu2O nanocubes are formed or not.