{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/34721"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/34721","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Optical Characterization of Ultrasmall, Hydrogen-Terminated and Carboxyl-Functionalized Silicon Nanoparticles in Aqueous Environments","abstract":"The primary theme of this dissertation is to characterize the optical and chemical properties of ultrasmall (~1 nm) silicon nanoparticles (Si-np) in aqueous environments, focusing on their potential for use as luminescent markers in biophysical and biological applications. Two systems are presented in detail: (1) Chapters 2-4 cover hydrogen-terminated Si-np that are prepared through electrochemical dispersion of a crystalline Si wafer and (2) Chapters 5-6 discuss carboxyl-functionalized Si-np prepared via thermal hydrosilylation of surface Si-H bonds with an ω-ester 1-alkene. Figure 1.1 shows a sketch (based on our results) of an ultrasmall Si-np that is ~1 nm in diameter and contains approximately thirty silicon atoms. The chemical groups shown on the surface are the different types of species that are discussed in this work: (a) hydrogen-terminated Si-np, (b) carboxyl-functionalized Si-np, and (c) various oxidized structures. Chemical and physical characterizations are done using nuclear magnetic resonance (1H-NMR), size exclusion chromatography (SEC), and infrared spectroscopy (FTIR). Optical characterization is done via absorption and steady-state photoluminescence (PL) and using capillary electrophoresis (CE) coupled with laser-induced fluorescence (LIF) detection. The instrumentation and experimental procedures are summarized in Chapter 8.","abstract_html":"The primary theme of this dissertation is to characterize the optical and chemical properties of ultrasmall (~1 nm) silicon nanoparticles (Si-np) in aqueous environments, focusing on their potential for use as luminescent markers in biophysical and biological applications. Two systems are presented in detail: (1) Chapters 2-4 cover hydrogen-terminated Si-np that are prepared through electrochemical dispersion of a crystalline Si wafer and (2) Chapters 5-6 discuss carboxyl-functionalized Si-np prepared via thermal hydrosilylation of surface Si-H bonds with an ω-ester 1-alkene. Figure 1.1 shows a sketch (based on our results) of an ultrasmall Si-np that is ~1 nm in diameter and contains approximately thirty silicon atoms. The chemical groups shown on the surface are the different types of species that are discussed in this work: (a) hydrogen-terminated Si-np, (b) carboxyl-functionalized Si-np, and (c) various oxidized structures. Chemical and physical characterizations are done using nuclear magnetic resonance (1H-NMR), size exclusion chromatography (SEC), and infrared spectroscopy (FTIR). Optical characterization is done via absorption and steady-state photoluminescence (PL) and using capillary electrophoresis (CE) coupled with laser-induced fluorescence (LIF) detection. The instrumentation and experimental procedures are summarized in Chapter 8.","abstract_has_math":false,"creators":["Eckhoff, Dean Alan"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Gratton, E."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-10-12T18:12:16Z","date_published":"2012-10-12T18:12:16Z","updated_at":"2026-07-22T22:25:31Z","subjects":["Hydrogen-terminated Si-np","Carboxyl-functionalized Si-np"],"languages":["en"],"rights":["©2006 Dean Alan Eckhoff"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["5639954"],"render_values":[{"text":"5639954","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/34721","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Gratton, E."]},{"key":"dc:creator","label":"Author","values":["Eckhoff, Dean Alan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-10-12T18:12:16Z","10000-01-01","2006-10"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Hydrogen-terminated Si-np","Carboxyl-functionalized Si-np"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["©2006 Dean Alan Eckhoff"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["5639954","http://hdl.handle.net/2142/34721"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The primary theme of this dissertation is to characterize the optical and chemical properties of ultrasmall (~1 nm) silicon nanoparticles (Si-np) in aqueous environments, focusing on their potential for use as luminescent markers in biophysical and biological applications. Two systems are presented in detail: (1) Chapters 2-4 cover hydrogen-terminated Si-np that are prepared through electrochemical dispersion of a crystalline Si wafer and (2) Chapters 5-6 discuss carboxyl-functionalized Si-np prepared via thermal hydrosilylation of surface Si-H bonds with an ω-ester 1-alkene. Figure 1.1 shows a sketch (based on our results) of an ultrasmall Si-np that is ~1 nm in diameter and contains approximately thirty silicon atoms. The chemical groups shown on the surface are the different types of species that are discussed in this work: (a) hydrogen-terminated Si-np, (b) carboxyl-functionalized Si-np, and (c) various oxidized structures. Chemical and physical characterizations are done using nuclear magnetic resonance (1H-NMR), size exclusion chromatography (SEC), and infrared spectroscopy (FTIR). Optical characterization is done via absorption and steady-state photoluminescence (PL) and using capillary electrophoresis (CE) coupled with laser-induced fluorescence (LIF) detection. The instrumentation and experimental procedures are summarized in Chapter 8.","Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-12T18:12:16Z No. of bitstreams: 1 Eckhoff_Dean.pdf: 2542406 bytes, checksum: 4e78dac6592ff80c0fbc345880b529a3 (MD5)","Made available in DSpace on 2012-10-12T18:12:16Z (GMT). No. of bitstreams: 1 Eckhoff_Dean.pdf: 2542406 bytes, checksum: 4e78dac6592ff80c0fbc345880b529a3 (MD5) Previous issue date: 2006-10","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Meng Tao (mengtao2@illinois.edu) on 2012-10-12T18:12:16Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:10:57-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Post 1923. No authorization form.","Post 1923. No authorization form.","U of I Only"]},{"key":"dc:title","label":"Title","values":["Optical Characterization of Ultrasmall, Hydrogen-Terminated and Carboxyl-Functionalized Silicon Nanoparticles in Aqueous Environments"]}]}],"canonical_facts":{"dc:contributor":["Gratton, E."],"dc:creator":["Eckhoff, Dean Alan"],"dc:date":["2012-10-12T18:12:16Z","10000-01-01","2006-10"],"dc:description":["The primary theme of this dissertation is to characterize the optical and chemical properties of ultrasmall (~1 nm) silicon nanoparticles (Si-np) in aqueous environments, focusing on their potential for use as luminescent markers in biophysical and biological applications. Two systems are presented in detail: (1) Chapters 2-4 cover hydrogen-terminated Si-np that are prepared through electrochemical dispersion of a crystalline Si wafer and (2) Chapters 5-6 discuss carboxyl-functionalized Si-np prepared via thermal hydrosilylation of surface Si-H bonds with an ω-ester 1-alkene. Figure 1.1 shows a sketch (based on our results) of an ultrasmall Si-np that is ~1 nm in diameter and contains approximately thirty silicon atoms. The chemical groups shown on the surface are the different types of species that are discussed in this work: (a) hydrogen-terminated Si-np, (b) carboxyl-functionalized Si-np, and (c) various oxidized structures. Chemical and physical characterizations are done using nuclear magnetic resonance (1H-NMR), size exclusion chromatography (SEC), and infrared spectroscopy (FTIR). Optical characterization is done via absorption and steady-state photoluminescence (PL) and using capillary electrophoresis (CE) coupled with laser-induced fluorescence (LIF) detection. The instrumentation and experimental procedures are summarized in Chapter 8.","Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-12T18:12:16Z No. of bitstreams: 1 Eckhoff_Dean.pdf: 2542406 bytes, checksum: 4e78dac6592ff80c0fbc345880b529a3 (MD5)","Made available in DSpace on 2012-10-12T18:12:16Z (GMT). No. of bitstreams: 1 Eckhoff_Dean.pdf: 2542406 bytes, checksum: 4e78dac6592ff80c0fbc345880b529a3 (MD5) Previous issue date: 2006-10","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Meng Tao (mengtao2@illinois.edu) on 2012-10-12T18:12:16Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:10:57-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Post 1923. No authorization form.","Post 1923. No authorization form.","U of I Only"],"dc:identifier":["5639954","http://hdl.handle.net/2142/34721"],"dc:language":["en"],"dc:rights":["©2006 Dean Alan Eckhoff"],"dc:subject":["Hydrogen-terminated Si-np","Carboxyl-functionalized Si-np"],"dc:title":["Optical Characterization of Ultrasmall, Hydrogen-Terminated and Carboxyl-Functionalized Silicon Nanoparticles in Aqueous Environments"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:31Z"}