College of Chemistry and Molecular Engineering , Qingdao University of Science and Technology , Qingdao 266042 , China.
International Center for Materials Nanoarchitectonics (WPI-MANA) & International Center for Young Scientists (ICYS) , National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan.
ACS Appl Mater Interfaces. 2018 Jul 18;10(28):23783-23791. doi: 10.1021/acsami.8b05517. Epub 2018 Jul 2.
We synthesized Au-Cu bimetallic alloy films with a controlled mesoporous architecture through electrochemical deposition using an electrolyte solution containing spherical polymeric micelles. The composition of the alloy films can be easily controlled by tuning the ratio between the Au and Cu species present in the electrolyte solution. At low Cu content, cage-type mesopores are formed, reflecting the parent micellar template. Surprisingly, upon increasing the Cu content, the cage-type mesopores fuse to form vertically aligned one-dimensional mesochannels. The vertical alignment of these mesopores is favorable for enhanced mass and ion transfer within the channels due to low diffusion resistance. The atomic distribution of Au and Cu is uniform over the entire film and free of any phase segregation. The as-synthesized mesoporous Au-Cu films exhibit excellent performance as a nonenzymatic glucose sensor with high sensitivity and selectivity, and the current response is linear over a wide range of concentrations. This work identifies the properties responsible for the promising performance of such mesoporous alloy films for the clinical diagnosis of diabetes. This micelle-assisted electrodeposition approach has a high degree of flexibility and can be simply extended from monometallic compounds to a multimetallic system, enabling the fabrication of various mesoporous alloy films suitable for different applications.
我们通过使用含有球形聚合物胶束的电解液通过电化学沉积合成了具有可控介孔结构的 Au-Cu 双金属合金薄膜。通过调整电解液中存在的 Au 和 Cu 物种的比例，可以轻松控制合金薄膜的组成。在 Cu 含量较低的情况下，形成笼型介孔，反映出母体胶束模板。令人惊讶的是，随着 Cu 含量的增加，笼型介孔融合形成垂直排列的一维介孔道。这些介孔的垂直排列由于扩散阻力低，有利于增强通道内的质量和离子传递。Au 和 Cu 的原子分布在整个薄膜中均匀且没有任何相分离。合成的介孔 Au-Cu 薄膜作为非酶葡萄糖传感器表现出优异的性能，具有高灵敏度和选择性，并且电流响应在较宽的浓度范围内呈线性。这项工作确定了这种介孔合金薄膜在糖尿病临床诊断中具有良好性能的原因。这种胶束辅助的电沉积方法具有很高的灵活性，可以从单金属化合物简单扩展到多金属体系，从而制造出适合不同应用的各种介孔合金薄膜。
