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Flow Sensing of Single Cell by Graphene Transistor in a Microfluidic Channel

2011; American Chemical Society; Volume: 11; Issue: 12 Linguagem: Inglês

10.1021/nl202579k

1530-6992

Priscilla Kailian Ang, Ang Li, Manu Jaiswal, Yu Wang, Han Wei Hou, John T. L. Thong, Chwee Teck Lim, Kian Ping Loh,

Nanopore and Nanochannel Transport Studies

The electronic properties of graphene are strongly influenced by electrostatic forces arising from long-range charge scatterers and by changes in the local dielectric environment. This makes graphene extremely sensitive to the surface charge density of cells interfacing with it. Here, we developed a graphene transistor array integrated with microfluidic flow cytometry for the "flow-catch-release" sensing of malaria-infected red blood cells at the single-cell level. Malaria-infected red blood cells induce highly sensitive capacitively coupled changes in the conductivity of graphene. Together with the characteristic conductance dwell times, specific microscopic information about the disease state can be obtained.