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Electrical Probing and Tuning of Molecular Physisorption on Graphene
journal contribution
posted on 2016-01-13, 00:00 authored by Girish
S. Kulkarni, Karthik Reddy, Wenzhe Zang, Kyunghoon Lee, Xudong Fan, Zhaohui ZhongThe
ability to tune the molecular interaction electronically can
have profound impact on wide-ranging scientific frontiers in catalysis,
chemical and biological sensor development, and the understanding
of key biological processes. Despite that electrochemistry is routinely
used to probe redox reactions involving loss or gain of electrons,
electrical probing and tuning of the weaker noncovalent interactions,
such as molecular physisorption, have been challenging, primarily
due to the inability to change the work function of conventional metal
electrodes. To this end, we report electrical probing and tuning of
the noncovalent physisorption of polar molecules on graphene surface
by using graphene nanoelectronic heterodyne sensors. Temperature-dependent
molecular desorptions for six different polar molecules were measured
in real-time to study the desorption kinetics and extract the binding
affinities. More importantly, we demonstrate electrical tuning of
molecule–graphene binding kinetics through electrostatic gating
of graphene; the molecular desorption can be slowed down nearly three
times within a gate voltage range of 15 V. Our results provide insight
into small molecule–nanomaterial interaction dynamics and signify
the ability to electrically tailor interactions, which can lead to
rational designs of complex chemical processes for catalysis and drug
discovery.
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binding affinitieschemical processesnoncovalent interactionsgraphene surfacedrug discoverymetal electrodesnoncovalent physisorptionwork functiongate voltage rangecatalysidesorption kineticsmoleculeMolecular Physisorption15 VGrapheneThe abilityprobe redox reactionsgraphene nanoelectronic heterodyne sensorssensor development
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