Utjecaj metode kemijske sinteze na svojstva nanostrukturnih oksida cinka

master's thesis

• Title (english): The influence of synthesis method on the properties of nanostructured zinc oxides
• Author: Ivan Šajnović
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Suzana Sopčić (član povjerenstva)
• Committee member: Željka Petrović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-07-13, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry; Applied Chemistry

Abstract

Istraživanja provedena u ovom radu bila su usmjerena na studij morfoloških, strukturnih, optičkih i poluvodičkih karakteristika čestica ZnO. Studiran je utjecaj procesa dopiranja – ugradnje kationa prijelaznog metala (Fe3+ iona) na navedene karakteristike ZnO. Dopirane čestice ZnO sintetizirane su pri atomskim udjelima Fe3+ iona od 0,5; 1 i 5 %. Hidrotermički postupak odabran je kao jednostavan, reproducibilan i ekološki prihvatljiv postupak sinteze čestica ZnO u dva različita lužnata medija, NH4OH i NaOH. Karakterizacija uzoraka provedena je sljedećim mjernim tehnikama: infracrvenom spektroskopijom (FT-IR), ultraljubičastom/vidljivom spektroskopijom (UV/Vis), pretražnom mikroskopijom s emisijom elektrona s pomoću polja (FE-SEM), energijski razlučujućom rendgenskom spektrometrijom (EDS) te rendgenskom difrakcijom (XRD). Rezultati svih tehnika potvdili su uspješnu ugradnju Fe3+ iona u kristalnu rešetku ZnO. Prema EDS rezultatima ugradnja Fe3+ iona odvija se do 1 at.%. Koncentracija Fe3+ primjesa ima značajan utjecaj, prema svim rezultatima, na morfološka, strukturna, optička i poluvodička svojstva ZnO. Utjecaj lužine na mehanizam kristalizacije nedopiranih i dopiranih čestica ZnO također je vidljiv iz dobivenih rezultata.

Abstract (english)

Morphological, structural, optical, and semiconducting properties of ZnO particles have been investigated in this work. The influence of Fe3+ doping on mentioned characteristics was in the focus of investigations. Iron doped ZnO samples were prepared by varying the Fe3+ concentration in the range from 0,5 to 5 at.%. The hydrothermal route has been chosen as a simple, reproducible and environmental friendly synthesis procedure of ZnO formation in NH4OH and NaOH media. The samples were characterized by following techniques: infrared spectroscopy (FT-IR), ultraviolet/visible spectroscopy (UV/Vis), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectrometry (EDS), and X-ray diffraction (XRD). The results of all techniques have confirmed the incorporation of Fe 3+ ions in the ZnO crystal lattice. According to the EDS results maximum amount of incorporated Fe3+ ions is 1 at.%. The Fe3+ dopant concentration has been correlated with morphological, structural, optical, and semiconducting properties of ZnO. The influence of synthesis medium (NH4OH and NaOH) on the crystallization mechanism is also evident from obtained results.

• Keywords: dopiranje; EDS; Fe3+ ioni; FE-SEM; FT-IR; UV/Vis; XRD; ZnO
• Keywords (english): doping; EDS; Fe3+ ions; FE-SEM; FT-IR; UV/Vis; XRD; ZnO
• Language: croatian
• URN:NBN: urn:nbn:hr:149:093336
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-07-21 11:40:08