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Controlled synthesis of pyrochlore Pr2Sn2O7 nanospheres with enhanced gas sensing performance

机译:具有增强的气体传感性能的Pyrochlore PR2SN2O7纳米球的控制合成

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Uniform Pr _(2) Sn _(2) O _(7) nanospheres were synthesized via a simple solvothermal route with ethylenediamine as the solvent. The as-prepared Pr _(2) Sn _(2) O _(7) nanospheres with the diameters of 20–50 nm are composed of nanoparticles with a size of 3–5 nm. The introduction of water into the reaction solution results in the formation of smaller Pr _(2) Sn _(2) O _(7) nanospheres with poor crystallinity or SnO _(2) particles, indicating that ethylenediamine has a complicated effect on the generation of Pr _(2) Sn _(2) O _(7) nanospheres. The UV-vis spectrum reveals that the band gap of synthesized Pr _(2) Sn _(2) O _(7) nanospheres is about 4.19 eV, much higher than the theoretical value calculated by DFT. The enhanced gas sensing performances could be attributed to the unique mesoporous nanosphere structure, which can significantly facilitate gas diffusion and mass transportation in sensing materials.
机译:通过用乙二胺作为溶剂,通过简单的溶剂热途径合成均匀Pr _(2)Sn _(2)αα-(7)α-(7)烷基球。具有直径为20-50nm的AS制备的PR _(2)Sn _(2)Oα纳米球由尺寸为3-5nm的纳米颗粒组成。将水引入反应溶液中导致具有差的结晶度或SnO _(2)颗粒的较小PR _(2)Sn _(2)oα(2)o_(7)纳米球,表明乙二胺对乙二胺有一种复杂的效果发电PR _(2)SN _(2)O _(7)纳米球。 UV-VIS光谱显示合成PR _(2)Sn _(2)o _(2)o_(7)纳米球的带隙约为4.19eV,远高于DFT计算的理论值。增强的气体传感性能可归因于独特的介孔纳米结构,其可以显着促进感测材料中的气体扩散和质量运输。

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