Surface modifications of TiO2 nanostructured materials induced by 120 MeV Ag ions

IF 1.6 4区化学 Q4 CHEMISTRY, PHYSICAL

Surface and Interface Analysis Pub Date : 2023-07-16 DOI:10.1002/sia.7247

B. B. Tripathy, H. Rath, N. C. Mishra, Jayashree Das, D. Mishra

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Abstract

The effect of swift heavy ion irradiation on structural, optical, and microstructural properties of TiO2 has been studied. Pellets prepared from TiO2 nanoparticles have been irradiated by 120 MeV Ag ions at different fluences ranging from 5 × 1011 to 1 × 1013 ions cm−2. X‐ray diffraction (XRD), Raman, UV–visible, and photoluminescence (PL) studies indicated anatase phase both in as‐prepared and irradiated pellets. XRD study revealed the crystallite size of the particles as ~16 nm, which is close to the upper limit of the particle size where anatase phase is most stable. Our study thus established the importance of the initial microstructure on the irradiation response of the nanoparticles. Though irradiation did not affect the crystal structure and the polycrystalline nature of the anatase TiO2, it suppressed the crystalline volume fraction. Poisson fitting of the suppression of XRD peak area with irradiation fluence revealed radius of the track of each 120 MeV Ag ion in TiO2 nanoparticles as ~2.1 nm. Irradiation, in addition to creating disorder, darkened the surface of the pellets because of the creation of oxygen vacancies in the TiO6 octahedra. Reorganization of these defects led to suppression of the band gap of TiO2 nanoparticles from 3.19 eV of the pristine sample to 3 eV for samples irradiated beyond a critical fluences 3 × 1012 ions cm−2. The size of the nanoparticles and their agglomeration remained unaffected by irradiation as indicated by field emission scanning electron micrographs.

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120mev银离子诱导TiO2纳米结构材料的表面修饰

研究了快速重离子辐照对TiO2结构、光学和微结构性能的影响。用120 MeV的Ag离子对TiO2纳米颗粒进行了5 × 1011 ~ 1 × 1013离子cm - 2的辐照。X射线衍射(XRD)、拉曼(Raman)、紫外可见(UV-visible)和光致发光(PL)研究表明，在制备的和辐照的颗粒中都存在锐钛矿相。XRD研究表明，颗粒的晶粒尺寸为~16 nm，接近锐钛矿相最稳定的晶粒尺寸上限。因此，我们的研究确定了初始微观结构对纳米颗粒辐照响应的重要性。虽然辐照对锐钛矿TiO2的晶体结构和多晶性质没有影响，但对晶体体积分数有抑制作用。对x射线衍射峰面积随辐照影响的泊松拟合结果表明，每个120 MeV Ag离子在TiO2纳米粒子中的迹线半径为~2.1 nm。辐照除了造成混乱外，还使颗粒表面变暗，因为在TiO6八面体中产生了氧空位。这些缺陷的重组导致TiO2纳米粒子的带隙从原始样品的3.19 eV抑制到超过临界影响3 × 1012离子cm - 2的样品的3 eV。场发射扫描电子显微图显示，纳米颗粒的大小及其团聚不受辐照的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Surface and Interface Analysis 化学-物理化学

CiteScore

3.30

自引率

5.90%

发文量

130

审稿时长

4.4 months

期刊介绍： Surface and Interface Analysis is devoted to the publication of papers dealing with the development and application of techniques for the characterization of surfaces, interfaces and thin films. Papers dealing with standardization and quantification are particularly welcome, and also those which deal with the application of these techniques to industrial problems. Papers dealing with the purely theoretical aspects of the technique will also be considered. Review articles will be published; prior consultation with one of the Editors is advised in these cases. Papers must clearly be of scientific value in the field and will be submitted to two independent referees. Contributions must be in English and must not have been published elsewhere, and authors must agree not to communicate the same material for publication to any other journal. Authors are invited to submit their papers for publication to John Watts (UK only), Jose Sanz (Rest of Europe), John T. Grant (all non-European countries, except Japan) or R. Shimizu (Japan only).