2026-09-21T19:14:39Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/29653 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Pop, Eric Lyons, Austin 2012-02-06T20:08:58Z 2012-02-06T20:08:58Z 2011-12 2012-02-06T20:08:58Z 2011-12 We use chemical vapor deposition (CVD) to synthesize graphene films on copper foil. After transferring the graphene to SiO2/Si substrates, we pattern the film into graphene nanoribbons (GNRs) of width < ~50 nm and length < ~ 700 nm with Ti/Au contacts. We perform low-bias, high-bias, and temperature-dependent electrical measurements. CVD-grown GNRs have mobility values from 100 to 500 cm2V-1s-1 and current densities up to ~3 mA/μm, suggesting that polycrystalline graphene grain boundaries play a limited role in the CVD-GNR electrical properties. CVD-GNR Raman spectra are comparable to lithographically patterned GNRs from exfoliated graphene. We fit our experimental data using a self-consistent model that includes GNR fringing capacitance and observe a weak temperature dependence of CVD-GNR mobility. We find a square root dependence of maximum current density on GNR resistance, implying that breakdown is primarily due to Joule heating. The electrical characteristics of CVD-GNRs illustrate the promise of wafer-scale graphene integration while revealing variability, contacts, and impurities as future challenges for improving performance. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-12-08T14:54:20Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 MS Thesis v7.docx: 3441206 bytes, checksum: 851b1d13658aaaefa5acff42a286fd39 (MD5) Lyons_Austin.pdf: 1382977 bytes, checksum: f57093d4d2163934cb9745184e86a247 (MD5) Made available in DSpace on 2012-02-06T20:08:58Z (GMT). No. of bitstreams: 3 Lyons_Austin.pdf: 1382977 bytes, checksum: f57093d4d2163934cb9745184e86a247 (MD5) MS Thesis v7.docx: 3441206 bytes, checksum: 851b1d13658aaaefa5acff42a286fd39 (MD5) license.txt: 4061 bytes, checksum: cf0bb5c291b6eae869906e8f93de356c (MD5) http://hdl.handle.net/2142/29653 en Copyright 2011 Austin Lyons graphene nanoribbons chemical vapor deposition (CVD) current density interconnects breakdown mobility transistors chemical vapor deposition Properties of graphene nanoribbons obtained by chemical vapor deposition Dissertation / Thesis text Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Thesis M.S. MS:Electr & Computer Eng-UIUC 10KS1200MS