Abstract
Polyvinylpyrrolidone (PVP)-capped rutile GeO2nanoparticles were synthesized through a facile hydrothermal process. The obtained nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TGA), and photoluminescence spectroscopy (PL). The capped GeO2nanoparticles showed significantly enhanced luminescence properties compared with those of the uncapped ones. We attributed this result to the effect of reducing surface defects and enhancing the possibility of electron-hole recombination of the GeO2nanoparticles by the PVP molecules. PVP-capped GeO2nanoparticles have potential application in optical and electronic fields.
Highlights
Germanium oxide (GeO2) is an important semiconductor material that has attracted much interest owing to its unique optical property and silica analogue [1, 2]
All the diffraction peaks could be indexed to rutile structure GeO2 with cell constants a0 = 4.831 Aand c0 = 5.568 A. These X-ray diffraction (XRD) peaks are in good agreement with those of the JCPDS card
We have successfully synthesized monodisperse PVP-capped rutile GeO2 nanoparticles, via a facile hydrothermal process. This result indicates that PVP could control the morphology of rutile GeO2 effectively
Summary
Germanium oxide (GeO2) is an important semiconductor material that has attracted much interest owing to its unique optical property and silica analogue [1, 2]. Rutile GeO2 nanoparticles, like other semiconductor nanoparticles, have high surface energy, and they agglomerate or coalesce extremely quickly [10] For this reason, many methods have been used to improve the stability of nanoparticles, such as changing of annealing temperature and doping of semiconductor and surfaces capped by various organic or inorganic layers, [11,12,13]. Compared with the aforementioned methods, it has several other advantages, such as facile process and gentle reaction conditions the rutile GeO2 modified by PVP had never been synthesized successfully before This is a problem that should be solved quickly
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