{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/109379"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/109379","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Scanning tunneling microscopy and spectroscopy of wet chemically synthesized porous graphene nanoribbons on hydrogen passivated silicon (100)","abstract":"This dissertation investigates wet-chemically synthesized atomically precise porous graphene nanoribbons (GNRs) exfoliated onto hydrogen passivated silicon H:Si(100) substrates using a dry contact transfer (DCT) method under ultrahigh-vacuum (UHV) conditions. The porous GNRs are characterized in UHV using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A unique electronic feature is observed at the pore sites in the STM topographic images. STS measurements indicate the presence of the pores significantly increases the bandgap compared to the surrounding GNR material. First-principles density functional theory (DFT) simulations are used to predict the band structure for the porous GNR. This is compared to theoretical simulations of the non-porous GNR case in order to elucidate how the addition of the pore to the GNR affects the electronic structure. Experimental results and first-principles computation modeling were shown to be in good agreement. Atomically precise GNRs with strategically placed pores expand the possibilities for applications in single-molecule detection and selectivity, including desalination and DNA sequencing.","abstract_html":"This dissertation investigates wet-chemically synthesized atomically precise porous graphene nanoribbons (GNRs) exfoliated onto hydrogen passivated silicon H:Si(100) substrates using a dry contact transfer (DCT) method under ultrahigh-vacuum (UHV) conditions. The porous GNRs are characterized in UHV using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A unique electronic feature is observed at the pore sites in the STM topographic images. STS measurements indicate the presence of the pores significantly increases the bandgap compared to the surrounding GNR material. First-principles density functional theory (DFT) simulations are used to predict the band structure for the porous GNR. This is compared to theoretical simulations of the non-porous GNR case in order to elucidate how the addition of the pore to the GNR affects the electronic structure. Experimental results and first-principles computation modeling were shown to be in good agreement. Atomically precise GNRs with strategically placed pores expand the possibilities for applications in single-molecule detection and selectivity, including desalination and DNA sequencing.","abstract_has_math":false,"creators":["Parsons, Kaitlyn Ann"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Lyding, Joseph W","Girolami, Gregory S","Li, Xiuling","Zhu, Wenjuan"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021-03-05T21:38:02Z","date_published":"2021-03-05T21:38:02Z","updated_at":"2026-07-22T22:24:50Z","subjects":["scanning tunneling microscopy","scanning tunneling spectroscopy","graphene nanoribbons","hydrogen passivation","silicon"],"languages":["en"],"rights":["Copyright 2020 Kaitlyn Parsons"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/109379","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lyding, Joseph W","Girolami, Gregory S","Li, Xiuling","Zhu, Wenjuan"]},{"key":"dc:creator","label":"Author","values":["Parsons, Kaitlyn Ann"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2021-03-05T21:38:02Z","2020-11-30","2020-12"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["scanning tunneling microscopy","scanning tunneling spectroscopy","graphene nanoribbons","hydrogen passivation","silicon"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Kaitlyn Parsons"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/109379"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This dissertation investigates wet-chemically synthesized atomically precise porous graphene nanoribbons (GNRs) exfoliated onto hydrogen passivated silicon H:Si(100) substrates using a dry contact transfer (DCT) method under ultrahigh-vacuum (UHV) conditions. The porous GNRs are characterized in UHV using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A unique electronic feature is observed at the pore sites in the STM topographic images. STS measurements indicate the presence of the pores significantly increases the bandgap compared to the surrounding GNR material. First-principles density functional theory (DFT) simulations are used to predict the band structure for the porous GNR. This is compared to theoretical simulations of the non-porous GNR case in order to elucidate how the addition of the pore to the GNR affects the electronic structure. Experimental results and first-principles computation modeling were shown to be in good agreement. Atomically precise GNRs with strategically placed pores expand the possibilities for applications in single-molecule detection and selectivity, including desalination and DNA sequencing.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2021-03-04 without embargo terms","The student, Kaitlyn Parsons, accepted the attached license on 2020-11-22 at 08:23.","The student, Kaitlyn Parsons, submitted this Dissertation for approval on 2020-11-22 at 08:34.","This Dissertation was approved for publication on 2020-11-30 at 14:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15932 on 2021-03-04 at 15:34:54","Made available in DSpace on 2021-03-05T21:38:02Z (GMT). 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The porous GNRs are characterized in UHV using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A unique electronic feature is observed at the pore sites in the STM topographic images. STS measurements indicate the presence of the pores significantly increases the bandgap compared to the surrounding GNR material. First-principles density functional theory (DFT) simulations are used to predict the band structure for the porous GNR. This is compared to theoretical simulations of the non-porous GNR case in order to elucidate how the addition of the pore to the GNR affects the electronic structure. Experimental results and first-principles computation modeling were shown to be in good agreement. Atomically precise GNRs with strategically placed pores expand the possibilities for applications in single-molecule detection and selectivity, including desalination and DNA sequencing.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2021-03-04 without embargo terms","The student, Kaitlyn Parsons, accepted the attached license on 2020-11-22 at 08:23.","The student, Kaitlyn Parsons, submitted this Dissertation for approval on 2020-11-22 at 08:34.","This Dissertation was approved for publication on 2020-11-30 at 14:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15932 on 2021-03-04 at 15:34:54","Made available in DSpace on 2021-03-05T21:38:02Z (GMT). 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