文献类型：期刊文献

英文题名：Length feature of ssDNA adsorption onto graphene oxide with both large unoxidized and oxidized regions

作者：Lei, Xiaoling[1,2];Ma, Huishu[3,4,5];Fang, Haiping[1,2]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Appl Phys, Div Interfacial Water, POB 800-204, Shanghai 201800, Peoples R China;[4]Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, POB 800-204, Shanghai 201800, Peoples R China;[5]Univ Chinese Acad Sci, Beijing 100049, Peoples R China

年份：2020

卷号：12

期号：12

起止页码：6699

外文期刊名：NANOSCALE

收录：;EI(收录号：20201508404683);WOS:【SCI-EXPANDED(收录号:WOS:000526890300010)】；

基金：We gratefully acknowledge Prof. Guosheng Shi, Dr Rongzheng Wan and Dr Yongshun Song for helpful discussions and their crucial reading of this manuscript. This work was supported by the NSFC (11305237 and 11974366), the Key Research Program of Chinese Academy of Sciences (Grant No. QYZDJ-SSW-SLH053), the supercomputer Center of the Chinese Academy of Sciences, and the Shanghai Supercomputer Center of China.

语种：英文

外文关键词：Biosensors - Oxidation - Hydrogen bonds - Graphene - Molecular dynamics - Adsorption - Bioinformatics

摘要：DNA/GO functional structures have been widely used in biosensors, biomedicine and materials science. However, most studies about DNA/GO functional structures do not take into account the coexistence of both large unoxidized and oxidized regions on GO sheets. This special local structure provides the boundary region, which is the junction area between unoxidized and oxidized regions, and exhibits a special amphiphilic property of the GO sheets. Here based on molecular dynamics simulations, our results predict that the adsorption efficiency of long strand ssDNA molecules adsorbed on GO is 43%. Further analysis has shown that the ssDNA adsorption behaviors on the GO surface are more likely to start in the boundary region, even for 20 mer ssDNA molecules. Looking into the adsorption dynamic process we can see that the hydrogen bonds between ssDNA and GO are very active and easily broken and formed, especially for the boundary region of the GO surface, resulting in easy capture and adsorption of the ssDNA molecules on this region. The result provides insightful understanding of the adsorption behavior of ssDNA molecules on this amphiphilic GO surface and is helpful in the design of DNA/GO functional structure-based biosensors.