School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People's Republic of China.
Institute of Materials, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China.
Sci Rep. 2017 Aug 31;7(1):10249. doi: 10.1038/s41598-017-10630-5.
Metallic core-shell nanostructures have inspired prominent research interests due to their better performances in catalytic, optical, electric, and magnetic applications as well as the less cost of noble metal than monometallic nanostructures, but limited by the complicated and expensive synthesis approaches. Development of one-pot and inexpensive method for metallic core-shell nanostructures' synthesis is therefore of great significance. A novel Cu network supported nanoporous Ag-Cu alloy with an Ag shell and an Ag-Cu core was successfully synthesized by one-pot chemical dealloying of Zr-Cu-Ag-Al-O amorphous/crystalline composite, which provides a new way to prepare metallic core-shell nanostructures by a simple method. The prepared nanoporous Ag-Cu@Ag core-shell alloy demonstrates excellent air-stability at room temperature and enhanced oxidative stability even compared with other reported Cu@Ag core-shell micro-particles. In addition, the nanoporous Ag-Cu@Ag core-shell alloy also possesses robust antibacterial activity against E. Coli DH5α. The simple and low-cost synthesis method as well as the excellent oxidative stability promises the nanoporous Ag-Cu@Ag core-shell alloy potentially wide applications.
金属核壳纳米结构由于在催化、光学、电学和磁学应用中性能更好，以及相对于单金属纳米结构成本更低，因此引起了人们的极大研究兴趣，但受到复杂和昂贵的合成方法的限制。因此，开发一种用于金属核壳纳米结构合成的一锅法和廉价方法具有重要意义。通过 Zr-Cu-Ag-Al-O 非晶/晶态复合材料的一锅化学脱合金反应，成功合成了具有 Ag 壳和 Ag-Cu 核的新型 Cu 网络支撑的纳米多孔 Ag-Cu 合金，为通过简单方法制备金属核壳纳米结构提供了新途径。所制备的纳米多孔 Ag-Cu@Ag 核壳合金在室温下具有出色的空气稳定性，甚至比其他报道的 Cu@Ag 核壳微球具有更高的氧化稳定性。此外，纳米多孔 Ag-Cu@Ag 核壳合金对大肠杆菌 DH5α 也具有强大的抗菌活性。简单且低成本的合成方法以及出色的氧化稳定性有望使纳米多孔 Ag-Cu@Ag 核壳合金具有广泛的应用前景。
