(412b) Electrical Properties of Controlled, Longitudinal Wrinkles on Graphene Produced Via Bacterial-Scaffold Shrinkage
AIChE Annual Meeting
2016 AIChE Annual Meeting
Nanoscale Science and Engineering Forum
Graphene and Carbon Nanotubes: Characterization, Functionalization, and Dispersion
Tuesday, November 15, 2016 - 3:30pm to 3:45pm
Graphene interfaced with biological cells is an important system with applications in cell actuated sensors, cell-driven field-effect-transistors (FETs), cell-excretion based FETs, and cell electrochemical transponders. However, little is known about cell induced mechanical actuation (such as wrinkling) of graphene. For example, local pi-orbital stretching, dipolar doping, and/or carrier puddling caused by wrinkles in graphene directly influence its electronic and phononic properties. Here, we show that bacteriumâ??s high surface energy, transportable volatile content and shrinkable microstructure can induce controlled and confined wrinkles on interfaced graphene sheets. The relaxation of pre-stretched bacterial cell in vacuum results in graphenic wrinkles to orient in the longitudinal direction to the strepto-bacillus cereus cells with a texture aspect-ratio of 0.125. Coarse-grained molecular dynamics (CGMD) simulations suggest that tension in graphene prompts wrinkle formation with wavelength of ~34 nm, consistent with the observed wavelength of 32.4 â?? 34.3 nm. This talk will (a) demonstrate directed electrophoresis of bacterial cells between electrodes for position-controlled 2D-wrinkle placement, and (b) discuss the electron density distribution and transport properties through wrinkled graphene. These graphenic bio-interfaced wrinkles can lead to novel nano/bio microelectromechanical systems with applications in electrical cell actuation, dehydration, sensing, restraining, retention, electro-microfluidics, and controlled delivery.