Metals and Materials International

, Volume 20, Issue 1, pp 163–167 | Cite as

Grain size dependent bandgap shift of SnO2 nanofibers

Article

Abstract

SnO2 nanofibers with various grain sizes ranging from 18.5 to 31.6 nm in diameter were fabricated by electrospinning a polymeric solution and subsequent controlled calcination of the as-spun fibers. The calcined fibers were polycrystalline and composed of densely packed nano-sized SnO2 grains. The effect of the nanograin size on the optical bandgap of SnO2 nanofibers was examined by ultraviolet-visible spectroscopy. The bandgap showed a strong dependence on the nanograin size. The bandgap decreased with increasing nanograin size. Some calculations were performed to understand the relationship between the experimentally obtained bandgaps of the SnO2 nanofibers and the theoretical ones. Quantum confinement and lattice strain of the SnO2 nanofibers are likely responsible for the bandgap shift. This suggests that optimization of the nanograin size is essential not only for achieving the required optical properties of oxide nanofibers, but also to secure superior working properties of electronic devices that are fabricated with electrospinning-synthesized oxide nanofibers.

Key words

fibers sol-gel grain growth scanning electron microscopy (SEM) bandgap 

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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Experimental Physics DepartmentOdessa National I.I. Mechnikov UniversityOdessaUkraine
  2. 2.School of Materials Science and EngineeringInha UniversityIncheonKorea
  3. 3.Institute of Atomic Physics and SpectroscopyUniversity of LatviaRigaLatvia

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