Synthesis of dense TiO2 nanoparticle multilayers using spin coating technique

A stack of nine layers is prepared by sequential spun casting of commercially available colloidal TiO 2 nanoparticles of average size of 10–15 nm. Scanning electron microscopy (SEM) is employed to investigate the surface morphology of the multilayers. SEM micrographs exhibit formation of highly unif...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2018-04, Vol.124 (4), p.1-7, Article 314
Main Authors: DeSilva, L. Ajith, Thakurdesai, Madhavi, Bandara, T. M. W. J., Preston, Joshua, Johnson, Wyatt, Gaquere-Parker, Anne, Survase, Smita
Format: Article
Language:English
Subjects:
Absorptivity
Anatase
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Electrical properties
Energy gap
Machines
Manufacturing
Materials science
Multilayers
Nanoparticles
Nanotechnology
Optical and Electronic Materials
Optical properties
Optoelectronics
Physics
Physics and Astronomy
Processes
Rapid prototyping
Scanning electron microscopy
Spectrum analysis
Spin coating
Structural analysis
Surfaces and Interfaces
Thickness
Thin Films
Titanium dioxide
Titanium oxides
X-ray diffraction
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Summary:A stack of nine layers is prepared by sequential spun casting of commercially available colloidal TiO 2 nanoparticles of average size of 10–15 nm. Scanning electron microscopy (SEM) is employed to investigate the surface morphology of the multilayers. SEM micrographs exhibit formation of highly uniform and dense TiO 2 nanoparticle layers. The uniformity and density is found to be increasing with layer thickness. Structural characterization is carried out using X-ray diffraction (XRD) technique. XRD spectra indicate improvement in crystalline quality of all the layers with increasing layer thickness. All the layers are having mainly the anatase phase of TiO 2 . Optical characterization is carried out by UV–visible spectroscopy. The value of bandgap estimated on the basis of absorption coefficient is found to be 3.26 eV and approximately remains the same for the layers. The electrical characterization suggests that multilayer resistivity increases with increasing layer thickness. The good quality spin coated thin dense TiO 2 layers have many applications in optoelectronics.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-018-1735-x