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master's thesis
Površinski pojačano Ramanovo raspršenje odabranih organskih boja na nanočesticama srebra I zlata
Zagreb: University of Zagreb, Faculty of Science, 2021. urn:nbn:hr:217:548698
Đurasović, Izabela
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

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Đurasović, I. (2021). Površinski pojačano Ramanovo raspršenje odabranih organskih boja na nanočesticama srebra I zlata (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:548698

Đurasović, Izabela. "Površinski pojačano Ramanovo raspršenje odabranih organskih boja na nanočesticama srebra I zlata." Master's thesis, University of Zagreb, Faculty of Science, 2021. https://urn.nsk.hr/urn:nbn:hr:217:548698

Đurasović, Izabela. "Površinski pojačano Ramanovo raspršenje odabranih organskih boja na nanočesticama srebra I zlata." Master's thesis, University of Zagreb, Faculty of Science, 2021. https://urn.nsk.hr/urn:nbn:hr:217:548698

Đurasović, I. (2021). 'Površinski pojačano Ramanovo raspršenje odabranih organskih boja na nanočesticama srebra I zlata', Master's thesis, University of Zagreb, Faculty of Science, accessed 23 December 2024, https://urn.nsk.hr/urn:nbn:hr:217:548698

Đurasović I. Površinski pojačano Ramanovo raspršenje odabranih organskih boja na nanočesticama srebra I zlata [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2021 [cited 2024 December 23] Available at: https://urn.nsk.hr/urn:nbn:hr:217:548698

I. Đurasović, "Površinski pojačano Ramanovo raspršenje odabranih organskih boja na nanočesticama srebra I zlata", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:217:548698

Metadata
TitlePovršinski pojačano Ramanovo raspršenje odabranih organskih boja na nanočesticama srebra I zlata
Title (english)Surface-enhanced Raman scattering of selected organic dyes on silver and gold nanoparticles
AuthorIzabela Đurasović
MentorAdriana Kenđel (mentor)
Committee memberAdriana Kenđel (predsjednik povjerenstva)
Committee memberBiserka Prugovečki (član povjerenstva)
Committee memberIvana Biljan (član povjerenstva)
Committee memberSnežana Miljanić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2021-09-29, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Učinkovitost površinski pojačanog Ramanova raspršenja (SERS) nanočestica srebra i zlata dispergiranih u svježe pripravljenim i koncentriranim koloidima te imobiliziranih na staklu tretiranom s fluorovodičnom kiselinom i staklenom filter-papiru istraživana je pomoću metilenskog modrila (MetB) i rodamina B (RB) pri pobudama 532 i 785 nm. Koncentrirane koloidne suspenzije jače pojačavaju raspršenje zračenja boja u odnosu na svježe pripravljene koloide. U koncentriranom koloidu zlata pri pobudi 785 nm opažene spektralne promjene upućuju na drugačiju orijentaciju molekula MetB na površini zlata, u odnosu na koloid srebra. Atom sumpora iz fenotiazinskog sustava boje tvori kemijsku vezu sa zlatom, dok su u koloidu srebra molekule MetB vezane na supstrat preko atoma dušika fenotiazina. Kod svih korištenih supstrata pobuda pri 785 nm rezultira intenzivnim vrpcama MetB i RB, dok pobuda pri 532 nm daje vrpce slabijeg intenziteta za MetB, a vrpce RB zasjenjuje široka vrpca fluorescencije. U odnosu na koloidne suspenzije, nanočestice srebra i zlata imobilizirane na čvrstim podlogama nisu se pokazale reproducibilnim supstratima zbog neravnomjerne raspodjele nanočestica metala na površini supstrata.
Abstract (english)
Efficiency of surface-enhanced Raman scattering (SERS) of silver and gold nanoparticles dispersed in freshly prepared and concentrated colloids, and immobilized on hydrofluoric acid-treated glass and glass-fiber filter paper was investigated using methylene blue (MetB) and rhodamine B (RB) at excitation of 532 and 785 nm. Concentrated colloidal suspensions intensified the scattering of dye radiation, compared to freshly prepared colloids. In the concentrated gold colloid at 785 nm, observed spectral changes indicated a different orientation of MetB molecules on metal surface, compared to the silver colloid. The sulfur atom from phenothiazine created a chemical bond with gold, while MetB molecules in the silver colloid were bonded to the substrate via phenothiazine nitrogen atom. For all used substrates, the excitation at 785 nm resulted in intense MetB and RB bands, while excitation at 532 nm yielded lower-intensity bands for MetB, and a wide fluorescence band that overlapped RB bands. Metal colloidal suspensions were more reproducible substrates than the solid substrates, due to the uneven distribution of nanoparticles on the solid substrates.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:548698
Study programmeTitle: Graduate university studies in chemistry; specializations in: Research programme
Course: Research programme
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Embargo expiration date: 2023-09-29
Terms of useLicence In copyright icon
Created on2021-10-18 10:28:12