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master's thesis
Nanočestice srebra i zlata na silaniziranom staklu kao čvrsti supstrati u SERS spektroskopiji
Zagreb: University of Zagreb, Faculty of Science, 2022. urn:nbn:hr:217:154799
Ratkajec, Anastazija
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

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Ratkajec, A. (2022). Nanočestice srebra i zlata na silaniziranom staklu kao čvrsti supstrati u SERS spektroskopiji (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:154799

Ratkajec, Anastazija. "Nanočestice srebra i zlata na silaniziranom staklu kao čvrsti supstrati u SERS spektroskopiji." Master's thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:154799

Ratkajec, Anastazija. "Nanočestice srebra i zlata na silaniziranom staklu kao čvrsti supstrati u SERS spektroskopiji." Master's thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:154799

Ratkajec, A. (2022). 'Nanočestice srebra i zlata na silaniziranom staklu kao čvrsti supstrati u SERS spektroskopiji', Master's thesis, University of Zagreb, Faculty of Science, accessed 20 November 2024, https://urn.nsk.hr/urn:nbn:hr:217:154799

Ratkajec A. Nanočestice srebra i zlata na silaniziranom staklu kao čvrsti supstrati u SERS spektroskopiji [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2022 [cited 2024 November 20] Available at: https://urn.nsk.hr/urn:nbn:hr:217:154799

A. Ratkajec, "Nanočestice srebra i zlata na silaniziranom staklu kao čvrsti supstrati u SERS spektroskopiji", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:217:154799

Metadata
TitleNanočestice srebra i zlata na silaniziranom staklu kao čvrsti supstrati u SERS spektroskopiji
Title (english)Silver and gold nanoparticles on silanized glass as solid substrates in SERS spectroscopy
AuthorAnastazija Ratkajec
MentorAdriana Kenđel (mentor)
Committee memberAdriana Kenđel (predsjednik povjerenstva)
Committee memberŽeljka Soldin (član povjerenstva)
Committee memberĐani Škalamera (član povjerenstva)
Committee memberSnežana Miljanić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2022-09-26, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Istražena je SERS učinkovitost nanočestica srebra i zlata imobiliziranih na staklu silaniziranom (3- aminopropil)trimetoksisilanom, odnosno (3-merkaptopropil)trimetoksisilanom. Korištene nanočestice srebra i zlata pripremljene su redukcijom srebrova(I) nitrata hidroksilaminhidrokloridom, odnosno tetraklorozlatne(III) kiseline trinatrijevim citratom te je nastalim koloidima određena SERS aktivnost. Kao modelne molekule odabrani su metilensko modrilo (MetB) i 4- aminotiofenol (PATF) čiji su koncentracijski ovisni SERS spektri snimljeni pri valnim duljinama pobude 532 i 785 nm na svim priređenim SERS supstratima. U koloidu srebra, kod obje valne duljine pobude, molekule MetB adsorbiraju se na metal središnjim fenotiazinskim sustavom, vezujući se preko atoma dušika. Uočeno je da u koloidu srebra molekule PATF nakon pobude pri 532 nm katalitički dimeriziraju u 4,4'-dimerkaptoazobenzen, dok se kod pobude pri 785 nm uočava smjesa monomera i dimera u spektru. Pri pobudi od 785 nm u koloidu zlata opažene su spektralne promjene pri nižim koncentracijama MetB koje upućuju na promjenu orijentacije molekula na površini i vezanje na površinu zlata preko atoma sumpora. U odnosu na koloidne suspenzije, nanočestice srebra i zlata imobilizirane na silaiziranom staklu nisu se pokazale reproducibilnim supstratima zbog neravnomjerne raspodjele nanočestica metala na površini stakla i samo otopine najvećih koncentracija daju vrpce u SERS spektrima.
Abstract (english)
The SERS efficiency of silver and gold nanoparticles immobilized on glass silanized with (3- aminopropyl)trimethoxysilane and (3-mercaptopropyl)trimethoxysilane was investigated. Nanoparticles were prepared by reducing silver(I) nitrate with hydroxylamine hydrochloride, and tetrachloroauric(III) acid with trisodium citrate, respectively. For the prepared colloids the SERS activity was determined, as well. Methylene blue (MetB) and 4-aminothiophenol (PATF) were used as model molecules, whose concentration-dependent SERS spectra were recorded at excitation of 532 and 785 nm. In colloidal silver, MetB molecules were adsorbed on metal by the central phenothiazine system, binding through the nitrogen atom. In silver colloid PATF molecules catalytically dimerize into 4,4'-dimercaptoazobenzene after excitation at 532 nm, while spectra obtained from 785 nm showed a mixture of monomers and dimers. Using the excitation of 785 nm in the gold colloid, spectral changes were observed at lower concentrations of MetB, indicating orientation changes on the surface and binding to the gold surface via sulphur atoms. Compared to nanoparticles in colloidal suspensions, silver and gold nanoparticles immobilized on silanized glass did not prove to be reproducible substrates due to the uneven distribution of metal nanoparticles on the glass surface, therefore only solutions of the highest concentrations gave bands in SERS spectra.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:154799
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: 2024-09-26
Terms of useLicence In copyright icon
Created on2022-11-03 15:18:16