Abstract
This work represents an idea of forming nanoporous structures on surface of a LPD (liquid phase deposition)-derived GeO2 ceramic film by thermal reduction of GeO2 under hydrogen atmosphere. SEM, XRD and Raman analyses show that well-defined nanopores with size in range of 10–100 nm have been formed on surface of GeO2 film by annealing at 600 °C for 5–10 min. The pore formation process is furthered by structural defects which serve as active sites for the thermal reduction reaction. Fast phase transformation from hexagonal GeO2 to tetragonal GeO2 has occurred within the first 5 min of annealing. Green-yellow (2.32 eV) and violet (2.9 eV) photoluminescences originating from \( {\text{O}} {-} \mathop {\text{Ge}}\limits^{ \bullet \bullet } {-} {\text{O}} \) and ≡Ge–Ge≡ defects are observed in the film samples. The photoluminescence peak intensity decreases with increase of annealing time due to diminution of O/Ge ratio. The film annealed for 5 min exhibits a maximum green-yellow to violet PL peak ratio, which is related to generation of some new \( {\text{O}} {-} \mathop {\text{Ge}}\limits^{ \bullet \bullet } {-} {\text{O}} \) defects at the phase interface.
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Acknowledgments
This work was financially supported by National Natural Science foundation of China (50802046), National Basic Research Program of China (No. 2007CB924900), National Innovation Research Group foundation of China (No. 60221502), and Key Project of Shanghai Science and Technology Commission (No.07JC14018).
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Jing, C., Zhang, C. & Chu, J. Formation and characterization of nanoporous structures on surface of LPD-derived GeO2 ceramic film. J Porous Mater 20, 359–365 (2013). https://doi.org/10.1007/s10934-012-9605-y
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DOI: https://doi.org/10.1007/s10934-012-9605-y