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[{"key": "dc.contributor.advisor", "value": "Louhelainen, Jarmo", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "L\u00f6fman, Miika", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Tikkanen, Toni", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-12-17T07:45:14Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-12-17T07:45:14Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2019", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/66862", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4ss\u00e4 Pro gradu -tutkielmassa oli tarkoitus selvitt\u00e4\u00e4 pintavoimistetun Raman-spektroskopia -ilmi\u00f6n (SERS) k\u00e4ytt\u00f6mahdollisuuksia erilaisten forensiikassa tutkittavien materiaalien vertailu- ja materiaalintunnistustutkimuksissa. SERS-ilmi\u00f6 perustuu pintaplasmoniresonanssi-ilmi\u00f6\u00f6n (SPR) ja sen keski\u00f6ss\u00e4 ovat substraatteina toimivat hopea- ja kultananopartikkelit. Ty\u00f6n kirjallisuusosassa k\u00e4ytiin kattavasti l\u00e4pi Raman-spektroskopiaan ja SERS-menetelm\u00e4\u00e4n liittyv\u00e4t keskeisimm\u00e4t kokonaisuudet, kuten matemaattinen tausta, h\u00e4iri\u00f6t ja laitteiston rakenne. SERS-menetelm\u00e4ss\u00e4 tarkasteltiin substraattien, hot spottien ja aggregaation merkityst\u00e4 ilmi\u00f6n kannalta. SERS-menetelm\u00e4n k\u00e4ytt\u00f6mahdollisuuksia v\u00e4riaineiden ja r\u00e4j\u00e4hdeaineiden tutkimuksissa tarkasteltiin kirjallisuudesta l\u00f6ytyneiden esimerkkien kautta. Ty\u00f6n kokeellisessa osassa, ennen varsinaisia SERS-tutkimuksia, sitraattipelkistetty\u00e4 hopeakolloidia valmistettiin substraatiksi. My\u00f6s kaupallista kultakolloidia kokeiltiin. Nanopartikkeleiden aggregoinnin vaikutusta SERS-ilmi\u00f6n ilmentymiseen tutkittiin kaliumnitraatin ja natriumkloridin avulla. Hopeakolloidin laatu varmistettiin mittaamalla siit\u00e4 UV-Vis -spektri ja sen nanopartikkelijakauman kokoa selvitettiin pyyhk\u00e4isyelektronimikroskoopilla kuvantamalla. Ty\u00f6h\u00f6n valittiin n\u00e4ytematriiseiksi v\u00e4riaineet ja r\u00e4j\u00e4hdeaineet. V\u00e4riaineiden SERS-tutkimus oli ty\u00f6n p\u00e4\u00e4painopiste ja n\u00e4ytteiksi valittiin punaiset spray- ja ty\u00f6kalumaalit sek\u00e4 kuulak\u00e4rkikynien ja tussien musteet. R\u00e4j\u00e4hdeaineet valittiin, koska niiden forensiset tutkimukset ovat haastavia perinteisill\u00e4 tutkimusmenetelmill\u00e4. Tutkittavaksi r\u00e4j\u00e4hdeaineeksi valittiin trinitrotolueeni (TNT) ja selvitettiin, voidaanko SERS-menetelm\u00e4\u00e4 hy\u00f6dynt\u00e4\u00e4 r\u00e4j\u00e4hdeainej\u00e4\u00e4mien tunnistamisessa laimeasta TNT-liuoksesta. Ty\u00f6ss\u00e4 pystyttiin todistamaan, ett\u00e4 SERS-menetelm\u00e4 toimii ja sit\u00e4 voidaan hy\u00f6dynt\u00e4\u00e4 edell\u00e4 mainittujen n\u00e4ytemateriaalien vertailututkimuksissa ja apuna materiaalin tunnistuksessa. SERS-menetelm\u00e4n toiminta on vahvasti riippuvainen tutkittavan molekyylin rakenteesta, jolloin kaikista tuntemattomista spray- ja ty\u00f6kalumaalin\u00e4ytteist\u00e4 ei pystytty mittaamaan SERS-spektri\u00e4. Kuulak\u00e4rkikynien ja musteiden spektrit onnistuttiin mittaamaan SERS:ll\u00e4. K\u00e4sittelem\u00e4tt\u00f6m\u00e4st\u00e4 TNT-liuoksesta ei saatu mitattua hyv\u00e4\u00e4 SERS-spektri\u00e4, mutta pH 13 -s\u00e4\u00e4detyst\u00e4 liuoksesta saatiin spektri mitattua. SERS-menetelm\u00e4 soveltui hyvin spray- ja ty\u00f6kalumaalien sek\u00e4 musteiden mittauksessa. Menetelm\u00e4n soveltuvuus osoittautui huonoksi TNT:n mittauksessa. R\u00e4j\u00e4hdeaineiden SERS-mittaus vaatii lis\u00e4\u00e4 tutkimusta.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2019-12-17T07:45:14Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-12-17T07:45:14Z (GMT). No. of bitstreams: 0\n Previous issue date: 2019", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "101", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "Raman-mikroskopia", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "SERS", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "pintaplasmoniresonanssi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Raman-mikroskopia ja SERS-ilmi\u00f6 forensisessa materiaalianalytiikassa", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201912175355", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Kemian laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Chemistry", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Soveltava kemia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Applied Chemistry", "language": "en", "element": "subject", 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