Local symmetry breaking in SnO2 nanocrystals with cobalt doping and its effect on optical properties

Nanoscale
S RoyAnup K Ghosh

Abstract

X-ray photoemission spectroscopy (XPS), X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used to study the structural and morphological characteristics of cobalt doped tin(iv) oxide (Sn1-xCoxO2; 0 ≤ x ≤ 0.04) nanocrystals synthesized by a chemical co-precipitation technique. Electronic structure analysis using X-ray photoemission spectroscopy (XPS) shows the formation of tin interstitials (Sni) and reduction of oxygen vacancies (VO) in the host lattice on Co doping and that the doped Co exists in mixed valence states of +2 and +3. Using XRD, the preferential position of the Sni and doped Co in the unit cell of the nanocrystals have been estimated. Rietveld refinement of XRD data shows that samples are of single phase and variation of lattice constants follows Vegard's law. XRD and TEM measurements show that the crystallite size of the nanocrystals decrease with increase in Co doping concentration. SAED patterns confirm the monocrystalline nature of the samples. The study of the lattice dynamics using Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy shows the existence of many disorder activated forbidden optical phonon modes, along with the corresponding classical modes, signifyi...Continue Reading

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Citations

May 15, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Nandhini J UsharaniS S Bhattacharya
Nov 5, 2021·ACS Applied Materials & Interfaces·Lu YueJiujun Zhang

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Methods Mentioned

BETA
photoluminescence
X-ray
transmission electron microscopy
electron diffraction

Software Mentioned

VESTA ( Visualization for Electronic and Structural Analysis )
Bondstr
Full Prof Suite
VESTA
MOLYCHEM

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