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

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Tungsten 2020年第4期2卷 411-422页

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 Tata Institute of Fundamental Research Hyderabad 500046India Division of Healthcare Advancement Innovation and ResearchVellore Institute of Technology(VIT)Chennai 600127India Department of Physical Science and Engineering Nagoya Institute of TechnologyNagoya 466‑8555Japan

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 ***,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 ***,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 *** 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 *** 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 *** 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

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