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oai:www.ideals.illinois.edu:2142/50627 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Lyding, Joseph W. Liu, Ximeng 2014-09-16T17:24:31Z 2014-09-16T17:24:31Z 2014-08 2014-09-16 2014-08 This thesis documents a way of transferring large-scale graphene onto clean surfaces in an ultra-high vacuum scanning tunneling microscope chamber via a modified direct contact transfer method. A polyethylene terephthalate (PET) film was chosen as the material for supporting graphene during the in-situ transfer. Both a scanning electron microscope and an atomic force microscope were used to characterize the transferred graphene quality. This is the first demonstration of successfully transferring large-scale graphene in the ultra-high vacuum environment, which opens a lot of opportunities for studying the properties of pristine graphene and graphene-substrate interactions. Secondly, this thesis also documents an ongoing design and construction of a low temperature, ultra-high vacuum scanning tunneling microscope. A novel cooling mechanism was implemented in our design which includes a closed-cycle refrigerator in order to enable longer experiment durations and reduced costs of operation. So far we are able to reach a temperature of ~30 K with the STM scanner, vibration isolation and all electronic connections installed. We believe that this can be further improved by making some minor modifications to our design as our future work in order to reach our goal of operating at a temperature of <10 K. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2014-07-18T19:41:58Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Liu_Ximeng.pdf: 1518433 bytes, checksum: 17f8110232c17d24a8a755b09ed572c9 (MD5) Made available in DSpace on 2014-09-16T17:24:31Z (GMT). No. of bitstreams: 2 Ximeng_Liu.pdf: 1518433 bytes, checksum: 17f8110232c17d24a8a755b09ed572c9 (MD5) license.txt: 4058 bytes, checksum: d0e4b11f09673b255d523e5497a0a089 (MD5) http://hdl.handle.net/2142/50627 en Copyright 2014 Ximeng Liu Graphene Scanning tunneling microscopy Dry contact transfer Low temperature scanning tunneling microscope Large-scale graphene transfer in ultra-high vacuum and design of a low temperature ultra-high vacuum scanning tunneling microscope text Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Thesis M.S. MS:Electr & Computer Eng-UIUC 10KS1200MS