Effect of Oxygen Content on the Photoelectrochemical Activity of Crystallographically Preferred Oriented Porous Ta3N5 Nanotubes
Effect of Oxygen Content on the Photoelectrochemical Activity of Crystallographically Preferred Oriented Porous Ta3N5 Nanotubes
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DOI：
10.1021/acs.jpcc.5b05475
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发表时间：
2015-08
影响因子：
3.7
通讯作者：
Sherdil Khan;M. Zapata;D. L. Baptista;R. V. Goncalves;J. Fernandes;J. Dupont;M. J. Santos;S. Teixeira-S.
中科院分区：
文献类型：
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作者：
Sherdil Khan;M. Zapata;D. L. Baptista;R. V. Goncalves;J. Fernandes;J. Dupont;M. J. Santos;S. Teixeira-S.
采用热氮化法制备了与基体紧密结合的垂直取向的厚壁Ta 2 O 5纳米管，并制备了具有择优取向的多孔Ta 3 N5纳米管。通过阳极氧化对Ta 2 O 5纳米管在衬底上的粘附性和壁厚进行微调，从而有助于在较高温度下保持其用于氮化的管状形态。通过扫描电子显微镜、高分辨电子显微镜、X射线衍射、Rietveld精化、紫外-可见分光光度法、X射线光电子能谱、光致发光光谱和电化学技术对样品进行了研究。多孔Ta 3 N5纳米管结构中的氧含量对其光电化学活性有很大影响。结构分析表明，氮化温度在晶体学上控制了（110）方向沿着择优取向，降低了晶体结构和管状基体中的氧含量，提高了晶粒尺寸。
Crystallographically preferred oriented porous Ta3N5 nanotubes (NTs) were synthesized by thermal nitridation of vertically oriented, thick-walled Ta2O5 NTs, strongly adhered to the substrate. The adherence on the substrate and the wall thickness of the Ta2O5 NTs were fine-tuned by anodization, thereby helping to preserve their tubular morphology for nitridation at higher temperatures. Samples were studied by scanning electron microscopy, high-resolution electron microscopy, X-ray diffraction, Rietveld refinements, ultraviolet–visible spectrophotometry, X-ray photoelectron spectroscopy, photoluminescence spectra, and electrochemical techniques. Oxygen content in the structure of porous Ta3N5 NTs strongly influenced their photoelectrochemical activity. Structural analyses revealed that the nitridation temperature has crystallographically controlled the preferential orientation along the (110) direction, reduced the oxygen content in the crystalline structure and the tubular matrix, and increased the grain s...