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master's thesis
Pojačanje Ramanovog raspršenja na nanočesticama srebra i zlata veličine 20 nm
Zagreb: University of Zagreb, Faculty of Science, 2022. urn:nbn:hr:217:793168
Kapusta, Antonija
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

Cite this document

Kapusta, A. (2022). Pojačanje Ramanovog raspršenja na nanočesticama srebra i zlata veličine 20 nm (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:793168

Kapusta, Antonija. "Pojačanje Ramanovog raspršenja na nanočesticama srebra i zlata veličine 20 nm." Master's thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:793168

Kapusta, Antonija. "Pojačanje Ramanovog raspršenja na nanočesticama srebra i zlata veličine 20 nm." Master's thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:793168

Kapusta, A. (2022). 'Pojačanje Ramanovog raspršenja na nanočesticama srebra i zlata veličine 20 nm', Master's thesis, University of Zagreb, Faculty of Science, accessed 20 November 2024, https://urn.nsk.hr/urn:nbn:hr:217:793168

Kapusta A. Pojačanje Ramanovog raspršenja na nanočesticama srebra i zlata veličine 20 nm [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2022 [cited 2024 November 20] Available at: https://urn.nsk.hr/urn:nbn:hr:217:793168

A. Kapusta, "Pojačanje Ramanovog raspršenja na nanočesticama srebra i zlata veličine 20 nm", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:217:793168

Metadata
TitlePojačanje Ramanovog raspršenja na nanočesticama srebra i zlata veličine 20 nm
Title (english)Enhancement of Raman scattering on 20 nm silver and gold nanoparticles
AuthorAntonija Kapusta
MentorSnežana Miljanić (mentor)
Committee memberSnežana Miljanić (predsjednik povjerenstva)
Committee memberŽeljka Soldin (član povjerenstva)
Committee memberĐani Škalamera (član povjerenstva)
Committee memberAdriana Kenđel (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2022-02-25, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Istražena je SERS učinkovitost koloidnih suspenzija nanočestica srebra i zlata dimenzija 20 nm, stabiliziranih slojem citratnih iona (NP_cit) i poli(vinilpirolidona) (NP_PVP) na površini. Snimljeni su SERS spektri rodamina 6G, etidijeva bromida i tiofenskog derivata bistriarilborana pri tri valne duljine pobudnog zračenja 532, 785 i 1064 nm. Sve su molekule pozitivno nabijene te se adsorbiraju na nanočestice metala uslijed elektrostatskih privlačnih interakcija s negativno nabijenim citratnim ionima na površini metala. Primijećeno je, međutim, da pristup površini metala sterički ometaju taninska kiselina (AgNP_cit i AuNP_cit) i poli(vinil pirolidon) (AgNP_PVP i AuNP_PVP), sastojci dodani tijekom ili nakon priprave nanočestica. SERS spektri najčešće su opaženi nakon pobude Vis zračenjem (532 nm), koje je najbliže plazmonskoj frekvenciji nanočestica metala (α(AgNP) = 427 nm, α(AuNP) = 525 nm) i omogućava pre-rezonantne uvjete mjerenja nužne za pojačanje raspršenog zračenja.
Abstract (english)
SERS efficiency of colloidal suspensions of 20 nm silver and gold nanoparticles, stabilized by a surface layer of citrate ions (NP_cit) and poly (vinyl pyrrolidone) (NP_PVP) was investigated. SERS spectra of rhodamine 6G, ethidium bromide and thiophene derivative of bis-triarylborane were acquired at three excitation wavelengths 532, 785 and 1064 nm. All molecules are positively charged and adsorb on metal nanoparticles due to electrostatic attractive interactions with negatively charged citrate ions on the metal surface. It has been observed, however, that access to the metal surface was sterically hindered by tannic acid (AgNP_cit and AuNP_cit) and poly (vinyl pyrrolidone) (AgNP_PVP and AuNP_PVP), compounds added during or after nanoparticles preparation. The SERS spectra were mostly observed after excitation by Vis radiation (532 nm), which was closest to the plasmon frequency of metal nanoparticles (α(AgNP) = 427 nm, α(AuNP) = 525 nm) allowing preresonant measurement conditions necessary for the scattering enhancement.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:793168
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
Terms of useLicence In copyright icon
Created on2022-03-22 12:43:47