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Figure 5 | Nanoscale Research Letters

Figure 5

From: Morphology and Photoluminescence of HfO2Obtained by Microwave-Hydrothermal

Figure 5

a UV–vis absorbance spectra of rice-like HfO2nanostructures obtained by MH at 140 °C for 1 h. Inset illustrates a wide band model composed of intermediary levels within the band gap as well as the indirect electronic transition process.b PL spectrum at room temperature of rice-like HfO2nanostructures. Inset shows the different bond angles between the O–H–O bonds for the [HfO6] clusters

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