Molybdenum disulfide-graphene van der Waals heterostructures as stable and sensitive electrochemical sensing platforms  

作　　者：Stelbin Peter Figerez Kiran Kumar Tadi Krishna Rani Sahoo Rahul Sharma Ravi K.Biroju Aleena Gigi KAiswarya Anand Golap Kalita Tharangattu N.Narayanan 

机构地区：[1]Tata Institute of Fundamental Research,Hyderabad 500046,India [2]Division of Healthcare Advancement,Innovation and Research,Vellore Institute of Technology(VIT),Chennai 600127,India [3]Department of Physical Science and Engineering,Nagoya Institute of Technology,Nagoya 466‑8555,Japan

出　　处：《Tungsten》2020年第4期411-422,共12页钨科技（英文）

基　　金：This work was financially supported by Department of Science and Technology,India extramural research grant(Grant No.EMR/2017/000513);intramural grants at TIFR Hyderabad from the Department of Atomic Energy(DAE).

摘　　要：Atomic layers are sought after for molecular sensing due to their available high surface interaction area,and different types of monolayers are attempted for sensing in the recent past.However,their chemical stability towards these molecules is questioned in recent times and alternate methods need to be developed to circumvent such issues,while maintaining high sensitivity.Here,the van der Waals(vdWs)stacks of molybdenum disulfide(MoS_(2))and graphene are shown for their stable electrochemical sensing towards ascorbic acid(AA)and dopamine(DA)-two important biomolecules.AA is known to chemically react with MoS_(2) leading to unstable sensing platform,while here the graphene coverage is shown to protect the MoS_(2) even from low-energy plasma exposure while keeping the same high sensitivity.Upon proving the graphene-based protection of the sensor,such a sensing platform is shown for its applicability in DA sensing,where it is found to give a linear response in a wide range of concentrations(2.5 to 600μmol·L^(−1))and even selective sensing in the presence of AA.Such a stack is found to be not merely giving protection to the beneath MoS_(2) layer but also the inter-layer charge transfer due to work function differences being beneficial in bringing fast and high sensitivity to the next-generation sensors and point-of-care devices.

关 键 词：GRAPHENE Molecular sensing MoS_(2)etching MoS_(2)protection van der Waals structures Electrochemical sensing Ascorbic acid DOPAMINE 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]