生物分子
材料科学
水溶液
剥脱关节
催化作用
核苷酸
吸附
胶体
过渡金属
分子
化学工程
纳米技术
组合化学
无机化学
有机化学
化学
石墨烯
基因
工程类
生物化学
作者
M. Ayán-Varela,Óscar Pérez-Vidal,J.I. Paredes,Jose Munuera,S. Villar–Rodil,María Díaz‐González,César Fernández‐Sánchez,Virgília S. Silva,Mónica Cicuéndez,M. Vila,A. Martı́nez-Alonso,J.M.D. Tascón
标识
DOI:10.1021/acsami.6b13619
摘要
The exfoliation and colloidal stabilization of layered transition metal dichalcogenides (TMDs) in an aqueous medium using functional biomolecules as dispersing agents have a number of potential benefits toward the production and practical use of the corresponding two-dimensional materials, but such a strategy has so far remained underexplored. Here, we report that DNA and RNA nucleotides are highly efficient dispersants in the preparation of stable aqueous suspensions of MoS2 and other TMD nanosheets at significant concentrations (up to 5–10 mg mL–1). Unlike the case of common surfactants, for which adsorption on 2D materials is generally based on weak dispersive forces, the exceptional colloidal stability of the TMD flakes was shown to rely on the presence of relatively strong, specific interactions of Lewis acid–base type between the DNA/RNA nucleotide molecules and the flakes. Moreover, the nucleotide-stabilized MoS2 nanosheets were shown to be efficient catalysts in the reduction of nitroarenes (4-nitrophenol and 4-nitroaniline), thus constituting an attractive alternative to the use of expensive heterogeneous catalysts based on noble metals, and exhibited an electrocatalytic activity toward the hydrogen evolution reaction that was not impaired by the possible presence of nucleotide molecules adsorbed on their active sites. The biocompatibility of these materials was also demonstrated on the basis of cell proliferation and viability assays. Overall, the present work opens new vistas on the colloidal stabilization of 2D materials based on specific interactions that could be useful toward different practical applications.
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