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[{"key": "dc.contributor.advisor", "value": "Pettersson, Mika", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Garrido, Jose Antonio", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Lampinen, Aku", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2020-05-28T11:56:48Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2020-05-28T11:56:48Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2020", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/69293", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4m\u00e4n opinn\u00e4ytety\u00f6n kirjallisuuskatsaus k\u00e4y l\u00e4pi tyypillisimm\u00e4t grafeeniin pohjautuvat materiaalit, biosensoreihin liittyv\u00e4t olennaiset perusteet s\u00e4hk\u00f6kemiasta, niihin soveltuvat s\u00e4hk\u00f6kemian metodit ja lopuksi erilaisia sovelluksia, jotka k\u00e4ytt\u00e4v\u00e4t n\u00e4it\u00e4 metodeita biosensoreissa. Kokeellisen osion tavoitteena oli karakterisoida EGNITE, joka on uusi grafeeniin pohjautuva materiaali. Tarkoituksena oli l\u00f6yt\u00e4\u00e4 s\u00e4hk\u00f6kemiallinen metodi, jonka avulla t\u00e4t\u00e4 uutta materiaalia voitaisiin k\u00e4ytt\u00e4\u00e4 pH-mittauksissa. EGNITE osoittautui pH-herk\u00e4ksi materiaaliksi, mutta selke\u00e4n ja luotettavan metodin l\u00f6yt\u00e4misess\u00e4 oli haasteita. EGNITE:n karakterisointi suoritettiin k\u00e4ytt\u00e4m\u00e4ll\u00e4 Raman spektroskopiaa, pyyhk\u00e4isy-elektronimikroskopiaa (SEM), r\u00f6ntgenfotonispektroskopiaa (XPS) ja syklist\u00e4 voltametriaa (CV). Niiden tulokset osoittivat, ett\u00e4 EGNITE on hyvin kapasitiivinen materiaali (41,9 \u2013 52,2 mF/cm2) verrattaessa yksikerroksiseen grafeeniin (21 \u00b5F/cm2). T\u00e4m\u00e4n lis\u00e4ksi osoitettiin, ett\u00e4 k\u00e4ytt\u00e4m\u00e4ll\u00e4 autoklaavia, materiaalia saatiin onnistuneesti pelkistetty\u00e4 parantaen sen johtokyky\u00e4, joka my\u00f6s kasvatti sen rakenteessa esiintyvien defektien konsentraatiota. S\u00e4hk\u00f6kemialliset metodit, joita k\u00e4ytettiin pH-herkkyyden tutkimisessa, olivat CV, j\u00e4nnitekontrolloitu s\u00e4hk\u00f6kemiallinen impedanssispektroskopia (PEIS), kronoamperometria (CA) ja kronometrinen j\u00e4nnitekontrolloitu s\u00e4hk\u00f6kemiallinen impedanssispektroskopia (PEISW). Saadut tulokset k\u00e4ytt\u00e4en PEIS-menetelm\u00e4\u00e4 osoittautuivat kaikkein lupaavimmiksi. Niist\u00e4 mittauksista saatuun dataan sovitettiin onnistuneesti ekvivalenttipiiri pH-herkkyyden tutkimiseksi. T\u00e4m\u00e4n opinn\u00e4ytety\u00f6n tuloksista huolimatta lis\u00e4\u00e4 ty\u00f6t\u00e4 materiaalin parissa tulee tehd\u00e4, jotta toimiva ja toisinnettavissa oleva s\u00e4hk\u00f6kemiallinen metodi pH:n mittaamiseen l\u00f6ytyy. Syyn\u00e4 t\u00e4h\u00e4n on ongelmat toisinnettavuudessa ja n\u00e4ytteiden v\u00e4lisiss\u00e4 eroissa.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The literature review of this thesis goes through the most common types of graphene-based materials, essential fundamentals of electrochemistry required for biosensing, discusses the possible electrochemical methods and finally gives examples of applications taking advantage of said methods in different types of biosensing. The goal of the experimental work presented here was to characterize a novel graphene-based material called EGNITE and find an electrochemical method for measuring pH using the material as an electrode. The material was found to be pH sensitive but finding a clear and reliable method for pH sensing was challenging. The material was characterized using Raman spectroscopy, scanning electron microscopy, \nX-ray photoelectron spectroscopy and cyclic voltammetry. The results show very high capacitive properties (41.9 to 52.2 mF/cm2) for EGNITE in comparison to plain single-layer graphene (21 \u00b5F/cm2). They also show that an autoclaving treatment was successfully used to reduce EGNITE to increase its conductivity. However, this also increased its defect concentration. Electrochemical methods explored for the pH measurements were cyclic voltammetry, potentio electrochemical impedance spectroscopy (PEIS), chronoamperometry and PEIS-wait. PEIS measurements showed the most promise and equivalent circuit fitting was successfully used to inspect the material\u2019s pH sensitivity. However, further work has to be done to find a reliable and reproducible pH measuring method using EGNITE. This is because of the poor reproducibility of the measurements and sample to sample variation.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2020-05-28T11:56:48Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2020-05-28T11:56:48Z (GMT). No. of bitstreams: 0\n Previous issue date: 2020", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "116", "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": "eng", "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": "EGNITE", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Electrochemical methods for graphene-based materials for biosensors", "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-202005283550", "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": "Fysikaalinen kemia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Physical Chemistry", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, 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{"key": "dc.subject.yso", "value": "biosensorit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "grafeenioksidi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "pH", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "graphene", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "electrochemistry", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "measuring methods", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "electrodes", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "biosensors", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "graphene oxide", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "pH", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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