Facile fabrication of ultrathin freestanding nanoporous Cu and Cu-Ag films with high SERS sensitivity by dealloying Mg-Cu(Ag)-Gd metallic glasses
Facile fabrication of ultrathin freestanding nanoporous Cu and Cu-Ag films with high SERS sensitivity by dealloying Mg-Cu(Ag)-Gd metallic glasses
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通过脱合金 Mg-Cu(Ag)-Gd 金属玻璃轻松制备具有高 SERS 灵敏度的超薄独立式纳米多孔 Cu 和 Cu-Ag 薄膜
DOI：
10.1016/j.jmst.2020.08.049
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发表时间：
2021-04
影响因子：
10.9
通讯作者：
Zhang Laichang
中科院分区：
文献类型：
--
作者：
Zhao Yuanyun;Feng Qian;Zhao Chengliang;Wang Jianguo;Xie Chunxiao;Chang Chuntao;Li Yanjun;Zhang Laichang
通过脱合金化制备的纳米多孔金属由于其有趣的尺寸依赖的物理、化学和生物学性质而受到越来越多的关注。然而，通过脱合金化的方法制备金属超薄自支撑纳米多孔薄膜(UF-NPF)仍然具有挑战性。在这里，我们报道了一种新的策略，通过脱合金化厚的Mg-Cu(Ag)-Gd金属玻璃带来方便地制备柔性的Cu、Cu3Ag和CuAgUF-NPF。在脱合金化过程中，前驱体薄带的局部反应潜热导致玻璃化转变，导致在初始脱合金化的纳米多孔层和其下的过冷液相层之间形成固/液界面。由于原位生成的H_2在固/液界面上的鼓起作用，厚度为∼200 nm的Cu、Cu3Ag和CuAgUF-NPF可以从脱合金化带的外表面自剥离。此外，还发现罗丹明6G(R6G)在铜和铜银UF-NPF衬底上的表面增强拉曼散射检测下限分别为10−6M和10−11M，低于大多数用其他方法制备的铜和铜银衬底。这项工作提供了一种可靠、简单的策略来合成各种成本效益高且灵活的用于功能应用的金属UF-NPF。
Nanoporous metals prepared by dealloying have attracted increasing attention due to their interesting size-dependent physical, chemical, and biological properties. However, facile fabrication of metallic ultrathin freestanding nanoporous films (UF-NPFs) by dealloying is still challenging. Herein, we report a novel strategy of facile preparation of flexible Cu, Cu3Ag, and CuAg UF-NPFs by dealloying thick Mg-Cu(Ag)-Gd metallic glass ribbons. During dealloying, the local reaction latent heat-induced glass transition of the precursor ribbons leads to the formation of a solid/liquid interface between the initially dealloyed nanoporous layer and the underlying supercooled liquid layer. Due to the bulging effect of in situ generated H2on the solid/liquid interface, Cu, Cu3Ag, and CuAg UF-NPFs with thicknesses of ∼200 nm can self-peel off from the outer surface of the dealloying ribbons. Moreover, it was found that the surface-enhanced Raman scattering (SERS) detection limit of Rhodamine 6G (R6G) on the Cu and CuAg UF-NPF substrates are 10−6M and 10−11M, respectively, which are lower than most of the Cu and Cu-Ag substrates prepared by other methods. This work presents a reliable simple strategy to synthesize a variety of cost effective and flexible metallic UF-NPFs for functional applications.
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