463474 Electrical Properties of Controlled, Longitudinal Wrinkles on Graphene Produced Via Bacterial-Scaffold Shrinkage

Tuesday, November 15, 2016: 3:30 PM
Golden Gate 7 (Hilton San Francisco Union Square)
Shikai Deng1, Enlai Gao2, Yanlei Wang2, Soumyo Sen3, Sreeprasad Sreenivasan4, Sanjay Behura5, Petr Král6, Zhiping Xu2 and Vikas Berry5, (1)University of Illinois at Chicago, chicago, IL, (2)Tsinghua University, Beijing, China, (3)University of Illinois at Chicago, Chicago, IL, (4)Automotive Engineering, Clemson University, Greenville, SC, (5)Chemical Engineering, University of Illinois at Chicago, Chicago, IL, (6)Department of Chemistry, University of Illinois at Chicago, Chicago, IL

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 bacterium’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 – 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.

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