Journal
ACS NANO
Volume 7, Issue 6, Pages 4746-4755Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn304267b
Keywords
graphene; chemical gradient; droplet motion; plasma functionalization; chemical force microscopy; surface energy; adhesion
Categories
Funding
- Naval Research Laboratory Base Program
- Defense Threat Reduction Agency under MIPR [B112609M]
- National Research Council
- American Society of Engineering Education
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This work demonstrates the production of a well-controlled, chemical gradient on the surface of graphene. By inducing a gradient of oxygen functional groups, drops of water and dimethyl-methylphosphonate (a nerve agent simulant) are pulled in the direction of increasing oxygen content, while fluorine gradients push the droplet motion in the direction of decreasing fluorine content. The direction of motion Is broadly attributed to increasing/decreasing hydrophilicity, which is correlated to high/low adhesion and binding energy. Such tunability in surface chemistry provides additional capabilities in device design for applications ranging from microfluidics to chemical sensing.
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