Investigating plasmonic catalysis by surface-enhanced Raman spectroscopy

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dc.contributor Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta fi
dc.contributor University of Helsinki, Faculty of Science en
dc.contributor Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten sv
dc.contributor.author Sinausia, Daniel
dc.date.issued 2020
dc.identifier.uri URN:NBN:fi:hulib-202006233410
dc.identifier.uri http://hdl.handle.net/10138/316935
dc.description.abstract Along with the current studies on plasmonic photocatalysis that have emerged in the past years, we inquired into the catalytic performance of spherical gold and silver nanoparticles to further on investigate how their addition to doped molybdenum oxide (MoO3-x) could enhance its own plasmonic properties. Such studies were carried out synthesizing nanofilms on which the coupling oxidation of p-aminothiophenol (PATP) to p,p´-dimercaptoazobenzene (DMAB) was carried out using Surface Enhanced Raman Spectroscopy (SERS). The corresponding irradiation of 532 and 633nm light, observing satisfactory results with the nanoparticles and some conversion on the oxide when using the latter wavelength. Additional characterization of the different catalysts was performed using scanning electron microscopy (SEM) to observe their morphologies, confirming the spherical shape of the nanoparticles and the layered composition of the oxide. X-ray diffraction (XRD) was used to study the α-MoO3 structure of the semiconductor and the effects that the doping process had on it, showing how the distance between layers increased as we introduced more hydrides between them. These compounds were also analyzed with a spectrophotometer to study their performances when irradiated with light, showing a noteworthy increase in the absorbance after the reduction with the dopant. Finally, we tested the performance of these catalysts on the oxidation of benzyl alcohol when irradiated with 427 and 525 nm lamps, as well as with white xenon ones, not finding unfortunately any significant conversion during the time given though. en
dc.language.iso eng
dc.publisher Helsingin yliopisto fi
dc.publisher University of Helsinki en
dc.publisher Helsingfors universitet sv
dc.title Investigating plasmonic catalysis by surface-enhanced Raman spectroscopy en
dc.type.ontasot pro gradu -tutkielmat fi
dc.type.ontasot master's thesis en
dc.type.ontasot pro gradu-avhandlingar sv
dc.subject.discipline none und
dct.identifier.urn URN:NBN:fi:hulib-202006233410
dc.subject.specialization ei opintosuuntaa fi
dc.subject.specialization no specialization en
dc.subject.specialization ingen studieinriktning sv
dc.subject.degreeprogram Kemian ja molekyylitieteiden maisteriohjelma fi
dc.subject.degreeprogram Master's Programme in Chemistry and Molecular Sciences en
dc.subject.degreeprogram Magisterprogrammet i kemi och molekylära vetenskaper sv

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