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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Nanoscale Clarification of the Electronic Structure and Optical Properties of TiO2 Nanowire with an Impurity Phase upon Sodium Intercalation
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Nanoscale Clarification of the Electronic Structure and Optical Properties of TiO2 Nanowire with an Impurity Phase upon Sodium Intercalation

机译：含钠杂质相的TiO2纳米线的电子结构和光学性质的纳米级澄清

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摘要

The elettronic Structure and optical property of heterostructural TiO2 nanoWir (NW) synthesized a hydrothermal process have been extensively studied.. X-ray diffraction (XRD). and X-ray absorption near-edge structure (XANES) Were used to probe the crystal Structure arid the local structure and bonding (Unoccupied electronic states} of the as-obtained TiO2 NW, respectively. Discrepancy between XRD and XANES results without spatial resolution as observed and interpreted on the basis of the inhomogeneous distribution of a sodium titanate impurity 'phase :among the "bulk" pristine TiO2 phase. SCantring tranSmission X-ray microscopy (STXM), on the other hand, provides nanoseale Clarification for the diVergence with a spatial resOlution of 30 nm-. Using STXM, the nature of the sodium titanate impurity phase and priStine -TiO2 phase was thoroughly characterized, by comparing the XANES at the.Na g.-edge, Ti L-3,L-2 edge, and O K-edge. The local effect Of sodium lintercalation into the TiO2 matrix together with the presence of sodium titanate impurity to the electronic structure of the -entire NW specimen was addressed. Analysis was also conducted using 2D, XANES-XEOL (X-ray excited optical luminescence) spectroscopy. The optical interplay with stmctural properties reveals the element and site speCificity of the observed luminescerice: Of these, the dominant green emission and minor near-infrared (NlR) luminescence were attributed to the defect states from both Ti and 0 sites within the minor sodium tita,nate phase and the dominant Mtile TiO2 phase, respectively. The relationship between the observed luminescence intensity ratio and the phase content -ratio of rutile and sodium titanate is discussed.
机译：广泛研究了水热法合成的异质结构TiO2纳米线（NW）的电子结构和光学性质。X射线衍射（XRD）。 X射线吸收近缘结构和X射线吸收近边缘结构（XANES）被用来探测晶体结构和所获得的TiO2 NW的局部结构和键合（未占据的电子态）。观察和解释是基于钛酸钠杂质相的不均匀分布：在原始的原始TiO2相中;另一方面，透射X射线显微镜（STXM）提供了纳米seale澄清，用于分光。通过使用STXM，通过比较Na g.-边缘，Ti L-3，L-2边缘处的XANES，彻底表征了钛酸钠杂质相和priStine -TiO2相的性质，从而确定了30 nm-的空间分辨率。解决了整个纳米样品的电子结构中钠插层到TiO2基体中以及钛酸钠杂质对电子结构的局部影响，还使用2D，XANES-XEO进行了分析。 L（X射线激发光学发光）光谱。具有结构特性的光学相互作用揭示了所观察到的发光硅片的元素和位点的特异性：其中，主要的绿色发射和次要的近红外（NlR）发光归因于次要钠钛中Ti和0个位点的缺陷状态，磷酸酯相和占主导地位的Mtile TiO2相。讨论了观察到的发光强度比与金红石和钛酸钠的相含量比之间的关系。

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