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Epitaxial growth and cationic exchange properties of layered KNb3O8 thin films

机译：层状KNB3O8薄膜的外延生长和阳离子交换特性

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摘要

The KNb3O8 potassium triniobate phase is a layered compound that shows excellent photocatalytic activity, intercalation properties and electrochemical performances. In this study, we report the synthesis of this niobate in thin film form. Thin films of layered KNb3O8 phase were grown by pulsed laser deposition on (100)-oriented strontium titanate SrTiO3 substrates using targets with different compositions and various deposition parameters. Samples were analyzed by X-ray diffraction, scanning and transmission electron microscopy, X-ray energy dispersive and Rutherford backscattering spectroscopies. This work shows that KNb3O8 films are obtained in a narrow composition range, close to K1.13Nb3O8.7 that can be achieved with several combinations of the elaboration parameters (target composition, deposition temperature, target-substrate distance, laser fluence). Slight potassium amount variations in the film composition lead to the growth of other niobates (i.e. K2Nb8O21, K6Nb10.88O30, K3Nb7O19, K4Nb6O17). The KNb3O8 films are either made of elongated crystals (500 nm long, 50-75 nm wide, and 40 nm thick) or of flat lamellas. In both cases, they are (010)-preferentially oriented with epitaxial relationships with the substrate, namely (010)KNb3O8//(100) SrTiO3, [100] KNb3O8//[010] SrTiO3 and [001] KNb3O8//[001] SrTiO3. Protonation of the KNb3O8 films leads to a complete exchange of K+ ions by H3O+ ions that are themselves exchanged by Sn2+ ions after immersion in a tin chloride solution confirming the exchange reaction capabilities also in thin films. Exchange of K+ by Sn2+ leads to the band gap reduction of 0.33 eV.
机译：KNB3O8钾三角型相是层状化合物，其显示出优异的光催化活性，插层性和电化学性能。在这项研究中，我们以薄膜形式报告该铌酸酯的合成。使用具有不同组成的靶和各种沉积参数的靶通过脉冲激光沉积（100）型钛酸锶SrtiO3底物，通过脉冲激光沉积和各种沉积参数生长分层KNB3O8相的薄膜。通过X射线衍射，扫描和透射电子显微镜，X射线能量分散和Rutherford反向散射光谱分析样品。该工作表明，在窄的组成范围内获得了KNB3O8膜，接近K1.13NB3O8.7，其可以通过拟合参数的几种组合（靶组合物，沉积温度，靶衬底距离，激光量）来实现。薄膜组合物的轻微钾量变化导致其它铌酸盐的生长（即K2NB8O21，K6NB10.8030，K3NB7O19，K4NB6O17）。 KNB3O8薄膜由细长晶体（500nm长，50-75nm宽和40nm厚）或平坦的薄片制成。在这两种情况下，它们（010） - 用与基材的外延关系进行预取，即（010）KNB3O8 //（100）SRTiO3，[100] KNB3O8 // [100] KNB3O8 // [001] ] srtio3。 KNB3O8膜的质子化导致通过在浸入氯化锡溶液中的SN2 +离子之后通过SN2 +离子交换的H3O +离子的完全交换，所述氯化锡溶液也在薄膜中确认交换反应能力。通过SN2 +交换k +导致带隙减少0.33eV。

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  • 来源
    《RSC Advances》 |2017年第25期|共10页
  • 作者

    Waroquet A.; Demange V.; Hakmeh N.; Perriere J.; Freslon S.; Deputier S.; Guilloux-Viry M.;

  • 作者单位

    Univ Rennes 1 Inst Sci Chim Rennes CNRS UMR 6226 INSA ENSCR 263 Ave Gen Leclerc F-35042 Rennes France;

    Univ Rennes 1 Inst Sci Chim Rennes CNRS UMR 6226 INSA ENSCR 263 Ave Gen Leclerc F-35042 Rennes France;

    Univ Rennes 1 Inst Sci Chim Rennes CNRS UMR 6226 INSA ENSCR 263 Ave Gen Leclerc F-35042 Rennes France;

    Univ Paris 01 Inst Nanosci Paris 4 Pl Jussieu F-75005 Paris France;

    Univ Rennes 1 Inst Sci Chim Rennes CNRS UMR 6226 INSA ENSCR 263 Ave Gen Leclerc F-35042 Rennes France;

    Univ Paris 01 Inst Nanosci Paris 4 Pl Jussieu F-75005 Paris France;

    Univ Rennes 1 Inst Sci Chim Rennes CNRS UMR 6226 INSA ENSCR 263 Ave Gen Leclerc F-35042 Rennes France;

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