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Electrochemical characterization of tetrahedral amorphous carbon and detonation nanodiamond hybrid electrode for detection of dopamine

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Sainio, Sami
dc.contributor.author Leppänen, Elli
dc.date.accessioned 2017-02-24T10:52:31Z
dc.date.available 2017-02-24T10:52:31Z
dc.date.issued 2017-01-23
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/24690
dc.description.abstract fi
dc.description.abstract This work concentrated on electrochemical characterization, that was done to evaluate tetrahedral amorphous and detonation nanodiamond (ta-C+ND) hybrid electrodes suitability for dopamine (DA) detection. Characteristics investigated in this work were (i) electrode kinetics by using ruthenium, (ii) water window in perchloric acid, (iii) sensitivity towards DA and (iv) selectivity between DA and ascorbic acid (AA). Electrochemical characterization was carried out for ta-C and ta-C+ND electrodes with cyclic voltammetry (CV). After the characterization, ta-C+ND electrode was annealed in vacuum at 600C for 1 hour and measured again in DA solutions. Aim was to investigate how annealing affects the electrochemical performance of the hybrid electrode. ta-C+ND hybrid electrode properties were equally good or better compared to plain ta-C, where sensitivity towards DA was enhanced. ta-C+ND had reversible kinetics, wide water window of 3.01 V and detection limit of 100 nM DA. Selectivity towards DA in presence of AA was not achieved. With annealed ta-C+ND sensitivity and kinetics towards DA improved considerably compared to non annealed ta-C+ND. In addition, annealing increased resistance to passivation of the hybrid electrode. However, properties of the hybrid electrodes changed over time and measurement results were not reproducible in DA and DA+AA solutions. Literary review also pointed out that electrochemical behaviour of nanodiamonds is not well understood as the characterization of the used nanodiamonds is insufficient. Additionally, electrochemical experiments conducted with nanodiamonds had some inconsistencies. For more profound understanding of the phenomena, extensive characterization of surface chemistry and morphology is needed. en
dc.format.extent 78+10
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Electrochemical characterization of tetrahedral amorphous carbon and detonation nanodiamond hybrid electrode for detection of dopamine fi
dc.title Tetraedrinen amorfinen hiili ja nanotimantti hybridimateriaalin sähkökemiallinen karakterisointi dopamiinin havaitsemiseen en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.subject.keyword nanodiamond fi
dc.subject.keyword tetrahedral amorphous carbon fi
dc.subject.keyword cyclic voltammetry fi
dc.subject.keyword Dopamine fi
dc.subject.keyword ascorbic acid fi
dc.identifier.urn URN:NBN:fi:aalto-201702242573
dc.programme.major Biosensing and -electronics fi
dc.programme.mcode ELEC3045 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Laurila, Tomi
dc.programme LST - Master's Programme in Life Science Technologies (TS2013) fi
dc.ethesisid Aalto 7981
dc.location P1 fi
local.aalto.openaccess yes
dc.rights.accesslevel openAccess
local.aalto.idinssi 55784
dc.type.publication masterThesis
dc.type.okm G2 Pro gradu, diplomityö

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