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master's thesis
Pojačanje Ramanova raspršenja na nanočesticama zlata pripremljenim u puferu HEPES
Zagreb: University of Zagreb, Faculty of Science, 2022. urn:nbn:hr:217:606055
Radoslavić, Ivana
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

Cite this document

Radoslavić, I. (2022). Pojačanje Ramanova raspršenja na nanočesticama zlata pripremljenim u puferu HEPES (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:606055

Radoslavić, Ivana. "Pojačanje Ramanova raspršenja na nanočesticama zlata pripremljenim u puferu HEPES." Master's thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:606055

Radoslavić, Ivana. "Pojačanje Ramanova raspršenja na nanočesticama zlata pripremljenim u puferu HEPES." Master's thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:606055

Radoslavić, I. (2022). 'Pojačanje Ramanova raspršenja na nanočesticama zlata pripremljenim u puferu HEPES', Master's thesis, University of Zagreb, Faculty of Science, accessed 23 December 2024, https://urn.nsk.hr/urn:nbn:hr:217:606055

Radoslavić I. Pojačanje Ramanova raspršenja na nanočesticama zlata pripremljenim u puferu HEPES [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2022 [cited 2024 December 23] Available at: https://urn.nsk.hr/urn:nbn:hr:217:606055

I. Radoslavić, "Pojačanje Ramanova raspršenja na nanočesticama zlata pripremljenim u puferu HEPES", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:217:606055

Metadata
TitlePojačanje Ramanova raspršenja na nanočesticama zlata pripremljenim u puferu HEPES
Title (english)Enhancement of Raman scattering on gold nanoparticiples prepared in hepes buffer
AuthorIvana Radoslavić
MentorAdriana Kenđel (mentor)
Committee memberĐani Škalamera (predsjednik povjerenstva)
Committee memberSnežana Miljanić (član povjerenstva)
Committee memberAdriana Kenđel (član povjerenstva)
Committee memberBiserka Prugovečki (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2022-09-30, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Istražena je SERS (spektroskopija površinski pojačanog Ramanova raspršenja) učinkovitost i stabilnost koloida zlata pripravljenih redukcijom tetraklorozlatne(III) kiseline 4–(2– hidroksietil)–1–piperazinetilensulfonskom kiselinom (pufer HEPES) pomoću modelnih molekula rodamina 6G (R6G), (E)-1,2-di(piridin-4-il)etena (BPE) i dinatrijeva fluoresceinata (Na2Fl). Koloidi su sintetizirani na dva načina: sinteza „bez sjemena“ u kojoj su samo pomiješani metalna sol i pufer, te sinteza „sa sjemenom“ u koju se dodaje, osim metalne soli i pufera, i srebrov nitrat. Istražen je i utjecaj dodatka polimera poli(vinil-pirolidona) (PVP) na stabilnost pripravljenih koloida i pojačanje raspršenja zračenja. U svim koloidima zlata najjače pojačanje raspršenja nađeno je za molekulu BPE, vrlo vjerojatno zbog njezine neutralnosti i strukturnih značajki. Modelne molekule s nabojem elektrostatski odbija HEPES koji stabilizira nanočestice i nalazi se na površini zlata u obliku zwitter iona. Uvođenje stabilizirajućeg polimera PVP u sustav stvara steričku barijeru i dobiveni spektri modelnih molekula pokazuju vrlo slabe vrpce. No, takvi modificirani koloidi su najstabilniji kroz vrijeme.
Abstract (english)
The SERS (surface–enhaced Raman scattering) efficiency and stability of gold colloids prepared by reduction of tetrachloroauric(III) acid with 4-(2-hydroxyethyl)-1-piperazineethylenesulfonic acid (HEPES buffer) were investigated using rhodamine 6G (R6G), (E)-1,2-di(pyridin-4-yl)ethene (BPE) and disodium fluoresceinate (Na2Fl). Colloids were synthesized in two ways: the "seedless" synthesis, in which the metal salt and buffer are mixed, and the "seeded" synthesis, in which, in addition to the metal salt and buffer, silver nitrate was added. The influence of the poly(vinylpyrrolidone) - PVP addition on the stability of the prepared colloids and the scattering enhancement were investigated. In all gold colloids, the strongest SERS effect was found for the BPE molecules, most likely due to its neutrality and structural features. The charged model molecules are electrostatically repelled by HEPES, which stabilizes the nanoparticles and was located on the gold surface as zwitter ion. Introduction of the polymer PVP into the system resulted with a steric barrier and the obtained spectra of the model molecules show very weak bands. However, such modified colloids are the most stable over time.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:606055
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: 2024-09-30
Terms of useLicence In copyright icon
Created on2022-10-24 13:34:54