Brandt Amy J, Shakya Deependra M, Metavarayuth Kamolrat, Dolgopolova Ekaterina, Hensley Lauren, Duke Audrey S, Farzandh Sharfa, Stefik Morgan, Shustova Natalia B, Chen Donna A
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States.
Langmuir. 2020 Aug 25;36(33):9900-9908. doi: 10.1021/acs.langmuir.0c01535. Epub 2020 Aug 3.
Crystalline films of the Cu(BTC) (BTC = 1,3,5-benzenetricarboxylate) metal-organic framework (MOF) have been grown by dip-coating an alumina/Si(111) substrate in solutions of Cu(II) acetate and the organic linker HBTC. Atomic force microscopy (AFM) experiments demonstrate that the substrate is completely covered by the MOF film, while grazing incidence wide-angle X-ray scattering (GIWAXS) establishes the crystallinity of the films. Forty cycles of dip-coating results in a film that is ∼70 nm thick with a root mean squared roughness of 25 nm and crystallites ranging from 50-160 nm in height. Co ions were exchanged into the MOF framework by immersing the Cu(BTC) films in solutions of CoCl. By varying the temperature and exchange times, different concentrations of Co were incorporated into the films, as determined by X-ray photoelectron spectroscopy experiments. AFM studies showed that morphologies of the bimetallic films were largely unchanged after transmetalation, and GIWAXS indicated that the bimetallic films retained their crystallinity.
通过将氧化铝/Si(111)衬底浸涂在醋酸铜和有机连接体均苯三甲酸（HBTC）的溶液中，生长出了金属有机框架（MOF）Cu(BTC)（BTC = 1,3,5 - 苯三甲酸酯）的晶体薄膜。原子力显微镜（AFM）实验表明，衬底完全被MOF薄膜覆盖，而掠入射广角X射线散射（GIWAXS）则确定了薄膜的结晶度。浸涂40个循环后得到的薄膜厚度约为70 nm，均方根粗糙度为25 nm，微晶高度在50 - 160 nm范围内。通过将Cu(BTC)薄膜浸泡在CoCl溶液中，将Co离子交换到MOF框架中。通过改变温度和交换时间，X射线光电子能谱实验确定不同浓度的Co被引入到薄膜中。AFM研究表明，双金属薄膜在金属转移后形态基本不变，GIWAXS表明双金属薄膜保留了它们的结晶度。
