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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Experimental Evidence for the Carrier Transportation Enhanced Visible Light Driven Photocatalytic Process in Bismuth Ferrite (BiFeO3) One-Dimensional Fiber Nanostructures
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Experimental Evidence for the Carrier Transportation Enhanced Visible Light Driven Photocatalytic Process in Bismuth Ferrite (BiFeO3) One-Dimensional Fiber Nanostructures

机译：铁酸铋（BiFeO3）一维纤维纳米结构中载流子传输增强可见光驱动光催化过程的实验证据。

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摘要

The effective carrier transportation schemes in one-dimensional (1D) nanofibers of bismuth ferrite (BFO) have been experimentally demonstrated in comparison with their 3D particulate nanostructures. The structural analysis using X-ray diffraction technique revealed the rhombohedrat crystal structure with R3c space group of BiFeO3 particulate and fiber nanostructures. The influences of dimension on the optical properties are analyzed using UV-visible absorption/diffuse reflectance spectroscopy, where the band gap energy is found to be increased for fibers (similar to 2.39 eV) as compared to the particulates (similar to 2.32 eV). The photoluminescence (PL) spectroscopy analysis indicated a reduced radiative-emission in BFO fibers that could be attributed to the slower recombination of excited electron hole pairs in fibers as compared to particulates, which is also experimentally confirmed by estimating their fluorescence lifetime measurements. The-room temperature photocurrent conductivity measurements showed an enhanced photocurrent for the fibers, which revealed that the transportation of charge carriers is improved in fibers due to the delocalization of electrons in its conduction band and subsequent delayed recombination owing to the 1D confinement. The photocatalytic efficiency on the degradation of organic dyes (methylene blue and rhodamine B) under the simulated solar light irradiation showed an enhanced degradation rate for BFO fibers as compared to particulates. This could be attributed to the observed modifications in band energy structures and enhanced photocurrent conductivity of the fibers. Further, the effective carrier transportation-induced photocatalytic reactions that resulted from the increased number of *OH radicals is also probed by PL spectroscopy using terephthalic acid as a probing molecule.
机译：与它们的3D微粒纳米结构相比，已经在实验上证明了铋铁氧体（BFO）的一维（1D）纳米纤维中的有效载流子传输方案。 X射线衍射技术的结构分析表明，菱形晶体结构具有BiFeO3颗粒的R3c空间群和纤维纳米结构。使用紫外线-可见吸收/漫反射光谱法分析了尺寸对光学性能的影响，发现与颗粒（类似于2.32 eV）相比，纤维的带隙能量增加了（类似于2.39 eV）。光致发光（PL）光谱分析表明，BFO纤维的辐射发射减少，这归因于与颗粒相比，纤维中受激电子空穴对的重组速度较慢，这也通过估算其荧光寿命测量值在实验上得到了证实。室温光电流电导率测量显示纤维的光电流增强，这表明由于电子在其导带中的离域和随后由于一维禁闭而导致的复合重组，从而改善了电荷载流子在纤维中的传输。与颗粒相比，在模拟的太阳光照射下，光催化降解有机染料（亚甲基蓝和若丹明B）的效率提高了BFO纤维的降解率。这可以归因于观察到的带能结构的改变和纤维的增强的光电流传导性。此外，还通过使用对苯二甲酸作为探测分子的PL光谱探测了由增加的* OH自由基引起的有效的载流子诱导的光催化反应。

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