Modifikacija TiO2 nanocjevčica dobivenih elektrokemijskim postupkom-struktura i električna svojstva

undergraduate thesis

• Title (english): Modification of TiO2 nanotubes obtained by electrochemical process-structure and electrical properties
• Author: Vedrana Krajnović
• Mentor: Vladimir Dananić (mentor)
• Committee member: Vladimir Dananić (predsjednik povjerenstva)
• Committee member: Zlata Hrnjak-Murgić (član povjerenstva)
• Committee member: Andreja Gajović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics; Condensed Matter Physics

Abstract

TiO2 je zadnjih godina stekao veliku popularnost i kao običan oksid i kao nanostrukturiran, te se koristi u svakodnevnom životu i industriji. Svojstva TiO2 nanocjevčica se također intenzivno istraživati. Cilj ovog rada je na što jeftiniji i jednostavniji način sintetizirati TiO2 nanocjevčice te dekorirati površinu TiO2 nanocjevčica sa BaTiO3 nanočesticama sa svrhom istraživanja primjene za senzore svjetlosti. Kako bi se utvrdio utjecaj morfologije i strukture na funkcionalna svojstva dobivenog materijala, ispitala su se njihova morfološka, strukturna i električna svojstva. Dokazalo da se da anodizacija uistinu je izrazito efikasna metoda za kontroliranje rasta nanocjevčica. Dokazalo se i da je površina TiO2 nanocjevčica jako porozna,ali dekoriranjem te površine poroznost se smanjuje. Što mijenja svojstva, a time i primjenu takvog materijala. Dekoriranje također utječe i na anatasnu strukturu TiO2 nanocjevčica i samim time na električna svojstva istih. Dekoriranjem površine TiO2 nanocjevčica sa BaTiO3 nanočesticama, nanocjevčice dobivaju novo svojstvo, a to je fotovodljivost. Pokazalo se kako je fotovodljivost veća pri nižim frekvencijama i zadržava se i nakon prestanka osvjeljivanja uzorka.

Abstract (english)

For the past few years TiO2 has become widely known as a standard oxide, and as a nanostructure, and for it's use in everyday life, and industry. Properties of TiO2 nanotubes are being thoroughly investigated. The aim of this work was to synthesize TiO2 nanotubes at the lowest cost and simplest way, and decorate its surface with BaTiO3 nanoparticles to study their use as light sensors. To determine the effects of morfology and structure on functional properties of the synthesized material, their morfological, structural, and electrical properties were measured. It was proven that the surface of TiO2 nanotubes is very porous but with decorating the surface the porosity is being reduced. That will affect the properties, and the application of mentioned materials. Decoration of the surface will also affect the anatas structure of TiO2 nanotubes and its electrical properties. Decoration of the TiO2 nanotube surface with BaTiO3 nanoparticles will contribute to the new feature which is photoconductivity. It was proven that the photoconductivity is higher when the frequency is lower and it is retained even when the illumination has been stoped.

• Keywords: TiO2; TiO2 nanocjevčice; BaTiO3; anodizacija; električna svojstva; senzorska svojstva
• Keywords (english): TiO2; TiO2 nanotubes; BaTiO3; anodization; electrical properties; sensory properties
• Language: croatian
• URN:NBN: urn:nbn:hr:149:877916
• Project: Number: IP-2014-09-9419; Title: Nanokompoziti cinkovog oksida i titanijevog dioksida za fotonaponsku primjenu; Acronym: ZOTONanoPhotovolt; Leader: Andreja Gajović; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Applied Chemistry - Undergraduate 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: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-07-08 14:59:16