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master's thesis
Površinski pojačano Ramanovo raspršenje na nanočesticama srebra u koloidnoj suspenziji i na čvrstoj podlozi
Zagreb: University of Zagreb, Faculty of Science, 2020. urn:nbn:hr:217:496169
Banović, Helena
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

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Banović, H. (2020). Površinski pojačano Ramanovo raspršenje na nanočesticama srebra u koloidnoj suspenziji i na čvrstoj podlozi (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:496169

Banović, Helena. "Površinski pojačano Ramanovo raspršenje na nanočesticama srebra u koloidnoj suspenziji i na čvrstoj podlozi." Master's thesis, University of Zagreb, Faculty of Science, 2020. https://urn.nsk.hr/urn:nbn:hr:217:496169

Banović, Helena. "Površinski pojačano Ramanovo raspršenje na nanočesticama srebra u koloidnoj suspenziji i na čvrstoj podlozi." Master's thesis, University of Zagreb, Faculty of Science, 2020. https://urn.nsk.hr/urn:nbn:hr:217:496169

Banović, H. (2020). 'Površinski pojačano Ramanovo raspršenje na nanočesticama srebra u koloidnoj suspenziji i na čvrstoj podlozi', Master's thesis, University of Zagreb, Faculty of Science, accessed 23 December 2024, https://urn.nsk.hr/urn:nbn:hr:217:496169

Banović H. Površinski pojačano Ramanovo raspršenje na nanočesticama srebra u koloidnoj suspenziji i na čvrstoj podlozi [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2020 [cited 2024 December 23] Available at: https://urn.nsk.hr/urn:nbn:hr:217:496169

H. Banović, "Površinski pojačano Ramanovo raspršenje na nanočesticama srebra u koloidnoj suspenziji i na čvrstoj podlozi", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:217:496169

Metadata
TitlePovršinski pojačano Ramanovo raspršenje na nanočesticama srebra u koloidnoj suspenziji i na čvrstoj podlozi
Title (english)Surface-enhanced Raman scattering on silver nanoparticles in colloidal suspension and on a solid support
AuthorHelena Banović
MentorSnežana Miljanić (mentor)
Committee memberSnežana Miljanić (predsjednik povjerenstva)
Committee memberŽeljka Soldin (član povjerenstva)
Committee memberInes Primožič (član povjerenstva)
Committee memberAdriana Kenđel (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2020-12-16, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Istražena je SERS učinkovitost nanočestica srebra dispergiranih u koloidnim suspenzijama: svježe pripravljenoj, koncentriranoj i agregiranoj, te imobiliziranih na čvrstim podlogama: staklenom filter-papiru, staklu tretiranom s fluorovodičnom kiselinom i staklu silaniziranom s (3-aminopropil)trimetoskisilanom. Nanočestice srebra pripravljene su redukcijom srebrova(I) nitrata s trinatrijevim citratom te su nosile negativan naboj citratnih iona na površini. Rodamin 6G i fluorescein korišteni su kao modelne molekule pozitivnog i negativnog naboja. Zahvaljujući elektrostatskim privlačnim interakcijama pojačano Ramanovo raspršenje opaženo je za rodamin 6G sa svim istraživanim SERS supstratima, posebice u agregiranoj suspenziji srebra (EF = 5,68×106). Ramanovo raspršenje fluoresceina pojačano je samo na nanočesticama srebra imobiliziranim na staklu, i to najviše na nakupinama nanočestica u obliku prstena kave (EF = 8,23×103). Koloidne suspenzije srebra reproducibilniji su SERS supstrati od čvrstih SERS supstrata, što je posljedica nejednolike raspodjele nanočestica na čvrstim podlogama i otežanog fokusiranja zrake na uzorak prilikom snimanja spektra.
Abstract (english)
The SERS efficiency of silver nanoparticles dispersed in colloidal suspensions: freshly prepared, concentrated and aggregated, and immobilized on solid substrates: glass filter paper, hydrofluoric acid-treated glass and glass silanized with (3-aminopropyl)trimethoxysilane was investigated. Silver nanoparticles were prepared by reduction of silver(I) nitrate with trisodium citrate and carried a negative charge of citrate ions on the surface. Rhodamine 6G and fluorescein were used as model molecules of positive and negative charge. Owing to electrostatic attractive interactions, the enhanced Raman scattering was observed for rhodamine 6G with all investigated SERS substrates, especially in the aggregated silver suspension (EF = 5.68×106). The Raman scattering of fluorescein was enhanced only onsilver nanoparticles immobilized on glass, at most on the coffee ring-shaped aggregates (EF = 8.23×103). The silver colloidal suspensions were more reproducible SERS substrates than the solid SERS substrates, due to the uneven distribution of nanoparticles on the solid substrates and the difficulty of focusing the laser beam on the sample when recording the spectrum.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:496169
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: 2021-12-16
Terms of useLicence In copyright icon
Created on2021-02-16 13:21:02