Sinteza i karakterizacija SnO2 kvantnih točaka

undergraduate thesis

• Title (english): Synthesis and characterization of SnO2 quantum dots
• Author: Ivan Čanić
• Mentor: Stanislav Kurajica (mentor)
• Committee member: Stanislav Kurajica (predsjednik povjerenstva)
• Committee member: Gordana Matijašić (član povjerenstva)
• Committee member: Katarina Mužina (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-06-19, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu istraživana je priprava SnO2 kvantnih točaka hidrolizom i oksidacijom SnCl2·2H2O u vodenoj otopini u prisutnosti tioureje kao akceleratora reakcije. Završetkom sinteze nastala suspenzija SnO2 je centrifugirana te se istaloženi i osušeni produkt
(SnO2 prah) analizirao različitim metodama. Neke od metoda analize korištene u ovom radu jesu rendgenska difrakcija na prahu (PXRD), energijski razlučujuća rendgenska spektroskopija (EDS), pretražna elektronska mikroskopija (SEM), mikroskopija atomskih sila (AFM) i UV – Vis difuzna refleksijska spektrometrija (DRS). Dispergiranjem SnO2 praha u sintetičkom baznom ulju pripravljena je suspenzija za analizu pomoću dinamičkog raspršenja svjetlosti (DLS), a dispergiranjem SnO2 praha u vodi suspenzija za fluorescencijsku spektroskopiju. Provedenim analizama dobiveni su podaci o veličini kristalita, čestica te morfologiji i drugim svojstvima dobivenog produkta. Ovisno o metodi i uvjetima sinteze utvrđeno je da veličina pripravljenih kvantnih točaka SnO2 iznosi 2-5 nm.

Abstract (english)

In this work the preparation of SnO2 quantum dots was investigated. The synthesis path through hydrolysis and oxidation of SnCl2 x 2H2O in an aqueous solution in the presence of thiourea as a reaction accelerator is utilized. Upon the completion of synthesis, the resulting SnO2 suspension was centrifuged and dried. The precipitated product (SnO2 powder) was analyzed using powder X-ray diffraction (PXRD), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), atomic force microscopy (AFM), and UV-Vis diffuse reflectance spectroscopy (DRS). By dispersing the SnO2 powder in a synthetic base oil, a suspension was prepared for analysis using dynamic light scattering (DLS), while dispersing the SnO2 powder in water resulted in a suspension for fluorescence spectroscopy. Through these analyses, crystallite and particle size, as well as morphology and other properties of the obtained product was determined. The size of the SnO2 quantum dots was determined to be in the range of 2-5 nm, depending on the method and various synthesis conditions used.

• Keywords: kositrov(IV) oksid; kvantne točke
• Keywords (english): tin(IV) oxide; quantum dots
• Language: croatian
• URN:NBN: urn:nbn:hr:149:234178
• Study programme: Title: Materials Science and Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2026-06-19
• Created on: 2024-07-02 09:28:00