期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-01635-9
关键词
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资金
- National Science Foundation (NSF ECCS) [1610333]
- EPSRC
- ERC (Starter and Consolidator grants)
- University of Minnesota Doctoral Dissertation Fellowship
- University of Minnesota Nanofabrication Center
- NSF through National Nanotechnology Coordinated Infrastructure (NNCI) program
- NSF through MRSEC program [DMR-1420013]
- Minnesota Partnership for Biotechnology and Medical Genomics
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1610333] Funding Source: National Science Foundation
The many unique properties of graphene, such as the tunable optical, electrical, and plasmonic response make it ideally suited for applications such as biosensing. As with other surface-based biosensors, however, the performance is limited by the diffusive transport of target molecules to the surface. Here we show that atomically sharp edges of monolayer graphene can generate singular electrical field gradients for trapping biomolecules via dielectrophoresis. Graphene-edge dielectrophoresis pushes the physical limit of gradient-forcebased trapping by creating atomically sharp tweezers. We have fabricated locally backgated devices with an 8-nm-thick HfO2 dielectric layer and chemical-vapor-deposited graphene to generate 10x higher gradient forces as compared to metal electrodes. We further demonstrate near-100% position-controlled particle trapping at voltages as low as 0.45 V with nanodiamonds, nanobeads, and DNA from bulk solution within seconds. This trapping scheme can be seamlessly integrated with sensors utilizing graphene as well as other twodimensional materials.
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