Highly dispersed nanoporous Au rods have been prepared from arc melted Ag₇₀Au₃₀ alloy using site-selective electrochemical potential controlled dealloying method followed by Au anodizing process. The microstructure studies using scanning electron microscope and atomic force microscope indicate that selective removal of Ag from the Ag₇₀Au₃₀, precursor results in the formation of bi-continuous three-dimensional network structures with uniform pores and Au ligaments diameter of 6 nm. The noticeable features present in the optical studies of highly dispersed nanoporous Au rods using UV—Vis spectroscopy are two absorption bands peaking at 477 and 546 nm with overlapping of these bands at 520 nm. The antimicrobial testing by Agar well diffusion method reveals that the dispersed porous Au rods have greater inhibitory effect against both Gram-positive and Gram-negative bacterial strains. The results obtained provide opportunities to design and manipulate nanoporous Au rods at atomic level to achieve antimicrobial efficacy for biomedical applications.

Graphical abstract

中文翻译：

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分散纳米多孔金棒的合成及微观结构影响抗菌性能

使用位点选择性电化学电位控制的脱合金方法，然后是Au阳极氧化工艺，由电弧熔化的Ag ₇₀ Au ₃₀合金制备了高度分散的纳米多孔Au棒。使用扫描电子显微镜和原子力显微镜的微观结构研究表明，从 Ag ₇₀ Au _{30中选择性去除 Ag}，前体导致形成具有均匀孔隙和Au韧带直径为6nm的双连续三维网络结构。使用 UV-Vis 光谱对高度分散的纳米多孔 Au 棒进行光学研究中存在的显着特征是两个吸收带在 477 和 546 nm 处达到峰值，这些带在 520 nm 处重叠。琼脂井扩散法的抗菌测试表明，分散的多孔金棒对革兰氏阳性和革兰氏阴性菌株均具有较大的抑制作用。获得的结果为在原子水平上设计和操纵纳米多孔金棒提供了机会，以实现生物医学应用的抗菌功效。

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