{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/98310"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/98310","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Controlling structure and composition in double-heterojunction nanorods for high quantum yield and tunable color","abstract":"Limitations of colloidal semiconductor double-heterojunction nanorods reported thus far are low photoluminescence quantum yield, low color purity owing to wide size distribution, and emission over a narrow range of energies in the visible spectrum. Here we report alterations to the synthetic route which result in a narrow size and morphological distribution of CdS nanorod seeds tunable over a range of lengths from 10 – 50 nm and quantum-confined bandgaps between 2.62 – 2.78 eV. Variously sized CdS seeds are then used to investigate the effects of the rate of Zn-Oleate etching and of the rate and amount of ZnSe growth on DHNR morphology and optical properties. Structure and composition are investigated by TEM. Each are shown to depend sensitively on the synthetic route. We ultimately demonstrate DHNR with emission wavelength tunable between 2.04 - 2.16 eV, photoluminescence quantum yield up to 68%, and full width at half maximum photoluminescence as low as 84 meV.","abstract_html":"Limitations of colloidal semiconductor double-heterojunction nanorods reported thus far are low photoluminescence quantum yield, low color purity owing to wide size distribution, and emission over a narrow range of energies in the visible spectrum. Here we report alterations to the synthetic route which result in a narrow size and morphological distribution of CdS nanorod seeds tunable over a range of lengths from 10 – 50 nm and quantum-confined bandgaps between 2.62 – 2.78 eV. Variously sized CdS seeds are then used to investigate the effects of the rate of Zn-Oleate etching and of the rate and amount of ZnSe growth on DHNR morphology and optical properties. Structure and composition are investigated by TEM. Each are shown to depend sensitively on the synthetic route. We ultimately demonstrate DHNR with emission wavelength tunable between 2.04 - 2.16 eV, photoluminescence quantum yield up to 68%, and full width at half maximum photoluminescence as low as 84 meV.","abstract_has_math":false,"creators":["Drake, Gryphon Aubrey"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Materials Science & Engr","degree_department":null,"school":null,"contributors":["Shim, Moonsub"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-09-29T17:52:33Z","date_published":"2017-09-29T17:52:33Z","updated_at":"2026-07-22T22:24:35Z","subjects":["Nanoparticle synthesis","Quantum dots","Double-heterojunction nanorods"],"languages":["en"],"rights":["Copyright 2017 Gryphon Drake"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/98310","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Shim, Moonsub"]},{"key":"dc:creator","label":"Author","values":["Drake, Gryphon Aubrey"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-09-29T17:52:33Z","2019-09-30T09:15:32Z","2017-07-21","2017-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Science & Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["Nanoparticle synthesis","Quantum dots","Double-heterojunction nanorods"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Gryphon Drake"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/98310"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Limitations of colloidal semiconductor double-heterojunction nanorods reported thus far are low photoluminescence quantum yield, low color purity owing to wide size distribution, and emission over a narrow range of energies in the visible spectrum. Here we report alterations to the synthetic route which result in a narrow size and morphological distribution of CdS nanorod seeds tunable over a range of lengths from 10 – 50 nm and quantum-confined bandgaps between 2.62 – 2.78 eV. Variously sized CdS seeds are then used to investigate the effects of the rate of Zn-Oleate etching and of the rate and amount of ZnSe growth on DHNR morphology and optical properties. Structure and composition are investigated by TEM. Each are shown to depend sensitively on the synthetic route. We ultimately demonstrate DHNR with emission wavelength tunable between 2.04 - 2.16 eV, photoluminescence quantum yield up to 68%, and full width at half maximum photoluminescence as low as 84 meV.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-08-01","The student, Gryphon Drake, accepted the attached license on 2017-07-20 at 15:22.","The student, Gryphon Drake, submitted this Thesis for approval on 2017-07-20 at 15:48.","This Thesis was approved for publication on 2017-07-21 at 11:35.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11559 on 2017-09-29 at 11:20:03","Made available in DSpace on 2017-09-29T17:52:33Z (GMT). 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Here we report alterations to the synthetic route which result in a narrow size and morphological distribution of CdS nanorod seeds tunable over a range of lengths from 10 – 50 nm and quantum-confined bandgaps between 2.62 – 2.78 eV. Variously sized CdS seeds are then used to investigate the effects of the rate of Zn-Oleate etching and of the rate and amount of ZnSe growth on DHNR morphology and optical properties. Structure and composition are investigated by TEM. Each are shown to depend sensitively on the synthetic route. We ultimately demonstrate DHNR with emission wavelength tunable between 2.04 - 2.16 eV, photoluminescence quantum yield up to 68%, and full width at half maximum photoluminescence as low as 84 meV.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-08-01","The student, Gryphon Drake, accepted the attached license on 2017-07-20 at 15:22.","The student, Gryphon Drake, submitted this Thesis for approval on 2017-07-20 at 15:48.","This Thesis was approved for publication on 2017-07-21 at 11:35.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11559 on 2017-09-29 at 11:20:03","Made available in DSpace on 2017-09-29T17:52:33Z (GMT). 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