Oxidation degree dependent adsorption of ssDNA onto graphene-based surface  

作　　者：Huishu Ma Jige Chen Haiping Fang Xiaoling Lei 马慧姝;陈济舸;方海平;雷晓玲(Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Physics,East China University of Science and Technology,Shanghai 200237,China;Shanghai Synchrotron Radiation Facility,Zhangjiang Laboratory,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China)

机构地区：[1]Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Physics,East China University of Science and Technology,Shanghai 200237,China [4]Shanghai Synchrotron Radiation Facility,Zhangjiang Laboratory,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China

出　　处：《Chinese Physics B》2021年第10期488-494,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11305237 and 11974366);the Fundamental Research Funds for the Central Universities,China,the Natural Science Foundation of Shanghai,China(Grant No.19ZR1463200);the Key Research Program of Chinese Academy of Sciences(Grant No.QYZDJ-SSW-SLH053).

摘　　要：DNA/GO composite plays a significant role in the research field of biotechnology and nanotechnology,and attracts a great deal of interest.However,it is still unclear how the oxidation degree of the graphene-based surface affects the adsorption process of single-strand DNA(ssDNA).In this paper,based on the molecular dynamics simulations,we find that ssDNA molecule is absorbed on the GO surface in the most stable state with the oxidation degree around 15%.The microscopic mechanism is attributed to the van Der Walls and the electrostatic interactions between the ssDNA molecule and the graphene-based surface,which is accompanied with theπ-πstacking and hydrogen bond formation.The number ofπ-πstacking between ssDNA and GO reaches the maximum value when the oxidation degree is around 15%among all the GO surfaces.Our simulation results also reveal the coexistence of stretched and curved configurations as well as the adsorption orientation of ssDNA on the GO surface.Furthermore,it is found that the absorbed ssDNA molecules are more likely to move on the graphene-based surface of low oxidation degree,especially on pristine graphene.Our work provides the physics picture of ssDNA’s physisorption dynamics onto graphene-based surface and it is helpful in designing DNA/GO nanomaterials.

关 键 词：single-strand DNA(ssDNA) molecular dynamics simulation oxidation degrees graphene-based surfaces 

分 类 号：TB332[一般工业技术—材料科学与工程] O647.3[理学—物理化学]