Sinteza nanočestičnog poroznog silicija za primjene u spektroskopiji površinski pojačanog Ramanovog raspršenja

master's thesis

• Title (english): Synthesis of nanoporous silicon for applications in surface-enhanced Raman spectroscopy
• Author: Nikola Sabolić
• Mentor: Lara Mikac (mentor)
• Committee member: Snežana Miljanić (predsjednik povjerenstva)
• Committee member: Davor Kovačević (član povjerenstva)
• Committee member: Ivica Đilović (član povjerenstva)
• Committee member: Adriana Kenđel (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2021-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Spektroskopija površinski pojačanog Ramanovog raspršenja (SERS) je metoda u kojoj se
pojačava Ramanovo raspršenje molekula adsorbiranih na ili smještenih blizu metalnih
nanostruktura. Njezino je otkriće potaknulo sintezu raznovrsnih visoko-kvalitetnih SERS
supstrata. SERS supstrati u ovom radu pripremljeni su na šest načina: (i) depozicijom srebra na
SiO2 sfere, (ii) sintezom čestica s Ag jezgrom i mezoporoznim slojem SiO2, (iii) depozicijom
Ag na mljevenu i jetkanu Si pločicu, (iv) depozicijom Ag na porozni Si dobiven iz sintetskih
SiO2 sfera, (v) depozicijom Ag na porozni Si (PSi) uz korištenje formaldehida kao redukcijskog
sredstva i (vi) depozicijom dvostruke količine srebra na PSi uz korištenje formaldehida. Nakon
karakterizacije pripremljenim podlogama testirana je SERS aktivnost korištenjem 4-
merkaptofenilborne kiseline te na svima opaženo SERS pojačanje. Za podloge bazirane na
poroznom Si granice detekcije iznose 5×10-5 mol L-1
, dok je granice detekcije za čestice s Ag
jezgrom i mezoporoznim slojem SiO2 iznosila 1×10-5 mol L-1
.

Abstract (english)

Surface-enhanced Raman scattering spectroscopy (SERS) is a method in which Raman
scattering of molecules adsorbed on or located near metal nanostructures is amplified. Its
discovery initiated the synthesis of diverse high-quality SERS substrates. SERS substrates in
this work were prepared in six ways: (i) by deposition of Ag on SiO2 spheres, (ii) by synthesis
of particles with Ag core and mesoporous SiO2 layer, (iii) by deposition of Ag on ground and
etched Si wafer, (iv) by deposition of Ag on porous Si obtained from synthetic SiO2 spheres,
(v) by deposition of Ag on porous Si (PSi) using formaldehyde as a reducing agent and (vi) by
depositing twice the amount of silver on PSi using formaldehyde. After characterization, the
prepared substrates were tested for SERS activity using 4-mercaptophenylboronic acid and
SERS enhancement was observed on all of them. For substrates based on porous Si, the
detection limits achieved were 5×10-5 mol L-1
, while the detection limit for particles with Ag
core and mesoporous SiO2 layer was 1×10-5 mol L-1
.

• Keywords: 4-merkaptofenilborna kiselina; nanočestice; porozni silicij; površinski pojačano Ramanovo raspršenje; SERS; supstrati
• Keywords (english): 4-mercaptophenyl boronic acid; nanoparticles; porous silicon; substrates; surfaceenhanced Raman spectroscopy
• Language: croatian
• URN:NBN: urn:nbn:hr:217:849190
• Study programme: Title: 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 resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-10-20 09:31:45