Fotoredukcija intenzivnom pulsirajućom svjetlošću

undergraduate thesis

• Title (english): Photoreduction by intense pulsed light
• Author: Juraj Vuić
• Mentor: Petar Kassal (mentor)
• Committee member: Petar Kassal (predsjednik povjerenstva)
• Committee member: Irena Ivanišević (član povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-19, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Nanotehnologija i nanomaterijali predstavljaju prekretnicu u modernoj znanosti. Njihovom primjenom postiže se neizmjeran tehnološki napredak. Zbog izvrsnih svojstava posebnu ulogu imaju nanomaterijali poput nanosrebra i grafena. Međutim, postupci njihove proizvodnje mogu biti vrlo komplicirani te izuzetno skupi. Cilj ovog rada je dobiti grafen i nanosrebro postupkom fotoredukcije. U tu svrhu korištena je intenzivna pulsirajuća svjetlost (Intense pulsed light, IPL) pomoću koje je provedena redukcija srebrova klorida i grafen oksida. Kao rezultat su dobivene nanočestice srebra te reducirani grafen oksid dispergiran u različitim sustavima kao što su voda, etanol, N,N-dimetilacetamid (DMAc), citratni pufer pH vrijednosti 10 te etanol uz dodatak polivinil butirala (PVB) kao stabilizatora. Zbog svoje jednostavnosti, brzine, ekološke prihvatljivosti i niske potrošnje energije fotoredukcija intenzivnom pulsirajućom svjetlosti je sve češće primjenjivana metoda dobivanja nanomaterijala. Učinkovitost redukcije praćena je UV/Vis spektrofotometrom, a rezultati su prikazani grafički. Reduciranost grafen oksida se očituje pomakom maksimuma apsorpcije sa vrijednosti od oko 230 nm do oko 260 nm. Analizom rezultata može se zaključiti da se fotonska redukcija grafen oksida može uspješno provesti u različitim disperznim sredstvima. Također, uspješno je provedena fotoredukcija srebrovog klorida, a prisutnost nanosrebra potvrđena je pojavom maksimuma apsorbancije pri valnoj duljini od 420 nm.

Abstract (english)

Nanotechnology and nanomaterials represent a turning point in modern science. Their application leads to immense technological progress. Due to their excellent properties, nanomaterials such as nanosilver and graphene play a special role. However, their production processes can be very complicated and extremely expensive. The goal of this thesis is to obtain graphene and nanosilver by photoreduction. For this purpose, intense pulsed light (IPL) was used to reduce silver chloride and graphene oxide. As a result, silver nanoparticles and reduced graphene oxide were obtained dispersed in different solvents such as water, ethanol, N,N-dimethylacetamide (DMAc), citrate buffer with a pH value of 10, and ethanol with the addition of polyvinyl butyral (PVB) as a stabilizer. Due to its simplicity, promptitude, environmental suitability and low energy consumption, photoreduction with intense pulsed light is increasingly used as a production method of nanomaterials. The reduction efficiency was monitored with a UV/Vis spectrophotometer, and the results were presented graphically. The reduction of graphene oxide is manifested by the shift of the absorption maximum from a value of approximately 230 nm to 260 nm. Analyzing the results, it can be concluded that the photoreduction of graphene oxide can be successfully carried out in different dispersants. Also, the photoreduction of silver chloride was successfully performed, and the presence of nanosilver was confirmed by the appearance of an absorbance maximum at a wavelength of 420 nm.

• Keywords: nanotehnologija; nanomaterijali; grafen; nanosrebro; fotoredukcija; intenzivna pulsirajuća svjetlost
• Keywords (english): nanotechnology; nanomaterials; graphene; nanosilver; photoreduction; intense pulsed light
• Language: croatian
• URN:NBN: urn:nbn:hr:149:931635
• Project: Number: UIP-2020-02-9139; Title: Fotonsko sinteriranje inkjet ispisanih elektrokemijskih senzora i biosenzora na plastičnim podlogama; Title: Photonic sintering for inkjet printed electrochemical sensors and biosensors on plastic substrates; Acronym: PrintEChemSens; Leader: Petar Kassal; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: UIP
• Study programme: Title: Chemical 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: Open access
• Created on: 2023-03-15 09:36:38