2026-09-24T14:57:52Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/50491 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

U of I Only Restriction Lifted for Item 50602 on 2016-09-22T20:59:21Z. http://hdl.handle.net/2142/50491 en Copyright 2014 Jonghyun Choi Graphene Bio-sensing Nam, SungWoo Choi, Jonghyun 2014-09-16T17:18:00Z 2014-09-16T17:18:00Z 2016-09-22T20:59:21Z 2014-08 2014-09-16 2014-08 Graphene has been attracting significant research interests for post-silicon electronics due to its unique properties such as extraordinarily high carrier mobility, mechanical robustness/flexibility and biocompatibility. Furthermore, bio-sensing capabilities of graphene-based field-effect transistors interfaced with cells/tissues have been widely investigated by several research groups. However, the reported sensor devices based on graphene have been planar structures, which present substantial challenges for three dimensional (3D) intimate interfacing with biological systems and simultaneous extra- and intracellular sensing of action potentials. Here, a novel approach of graphene transfer is reported to provide intimate and conformal interfacing of biological systems with underlying sensing platforms. Polydimethylsiloxane (PDMS), which is widely accepted as biocompatible material, was used as the substrate material. Toluene was exploited to pre-swell the substrate before the transfer, to reduce the suspension of graphene and consequentially minimize the damage of graphene. The large area, conformal transfer of graphene was characterized with Raman spectroscopy and scanning electron microscope (SEM), demonstrating that the continuous monolayer graphene was on top of 3D features without significant damages. Furthermore, we expand our discussion to the fabrication of graphene-based field-effect sensors and 3D heterostructure consisting of graphene/graphite foams. Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2014-07-24T12:59:36Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Choi_Jonghyun.docx: 19047103 bytes, checksum: 39255b89ca5be695a23b17e14a96d0cc (MD5) Choi_Jonghyun.pdf: 2847620 bytes, checksum: 48c8c28d3fec4574051daad9fa9dcdef (MD5) Made available in DSpace on 2014-09-16T17:18:00Z (GMT). No. of bitstreams: 3 Jonghyun_Choi.pdf: 2847956 bytes, checksum: 4a9a0a59f654ca0e4500d3e9e5b943e1 (MD5) Choi_Jonghyun.docx: 19047103 bytes, checksum: 39255b89ca5be695a23b17e14a96d0cc (MD5) license.txt: 4063 bytes, checksum: dd84020d434c85abb209d66ef19b7319 (MD5) Embargo set by: Seth Robbins for item 50602 Lift date: 2016-09-16T17:18:17Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Field Effect Transistor (FET) Three-dimensional graphene/graphite structure for ultra-sensitive biosensor text Mechanical Sci & Engineering 1917 Mechanical Engineering 0133 University of Illinois at Urbana-Champaign Thesis M.S. MS:Mechanical Engineerng -UIUC 10KS0133MS