Optička svojstva nanočestica CuO

master's thesis

• Title (english): Optical properties of CuO nanoparticles
• Author: Ivna Vukić
• Mentor: Vladimir Dananić (mentor)
• Committee member: Vladimir Dananić (predsjednik povjerenstva)
• Committee member: Stanislav Kurajica (član povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-07-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Ovaj diplomski rad svojevrsni je nastavak završnog rada pod nazivom „Priprava i karakterizacija nanočestica CuO sintetiziranih u milireaktoru” u kojem je ispitan postupak dobivanja nanočestica bakrovog (II) oksida korištenjem milireaktora. Prednosti postupka sinteze u odnosu na klasične šaržne su brže dobivanje produkta pri sobnim uvjetima, bez ekstremnih tlakova i temperatura te kontinuirani način proizvodnje. U eksperimentalnom dijelu rada provedene su daljnje analize te su ispitana optička svojstva nanočestica. Nanočestice su karakterizirane kvalitativno UV/VIS metodom i FTIR-om. UV/VIS spektar dobivenih nanočestica pokazuje maksimume apsorpcija ispod 300 nm što karakterizira plavi pomak uslijed učinka kvantnog zatočenja, dok su na prikazanim FTIR spektrima vidljivi maksimumi frekvencija oko 600 cm^-1 koji odgovaraju vibracijama istezanja Cu-O veze. Pri kratkim vremenima zadržavanja u milireaktoru (τ < 6 minuta) i tretiranjem uzorka mikrovalnim zračenjem različitog intenziteta, dobivene nanočestice su pokazale ravnomjernu raspodjelu veličina čestica koja po literaturi odgovara nanočesticama veličine 2,5 nm. Mjeren je pH otopina i doveden je u korelaciju sa stvaranjem koloida bakrovih oksida. Kod izmjerenog pH < 5,66 ne dolazi do promjene boje uzorka neovisno o snazi mikrovalnog zračenja.

Abstract (english)

This diploma thesis is a continuation of the final paper entitled „Preparation and characterization of CuO nanoparticles synthesized in a milireactor” in which the process of obtaining copper (II) oxide nanoparticles using milireactor was examined. The advantages of the synthesis process compared to conventional batches are faster product production at room conditions, without extreme pressures and temperatures, and a continuous production method. In the experimental part of this paper, further analyzes were performed and the optical properties of nanoparticles were examined. Nanoparticles were characterized qualitatively by the UV/VIS method and FTIR. The UV/VIS spectrum of the obtained nanoparticles shows absorption maximum below 300 nm, which is characterized by a blue shift due to the quantum confinement effect, while the FTIR spectra show high frequencies around 600 cm^-1 corresponding to vibrations of Cu-O bond. With short retention times in the millireactor (τ <6 minutes) and treatment of the sample with microwave radiation of different intensities, the obtained nanoparticles showed a uniform distribution of particle sizes corresponding to nanoparticles of 2.5 nm found in the literature. The pH of the solutions was measured and correlated with the formation of colloids of copper oxides. At the measured pH <5.66, there is no change in the color of the sample regardless of the strength of the microwave radiation.

• Keywords: bakrov(II) oksid; nanočestice; milireaktor; optička svojstva; mikrovalno zračenje
• Keywords (english): copper (II) oxide; nanoparticles; milireactor; optical properties; microwave radiation
• Language: croatian
• URN:NBN: urn:nbn:hr:149:538639
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-04-07 08:55:34