Abstract In this paper, an investigation on microstructure, optical, dielectric, photocatalytic and electrochemical properties of monodispersed Ag-doped BaTiO3 nanosized particles modified with different contents of silver (1, 3, 5 mol %) prepared by viable sol-gel technique has been carried out. The obtained samples exhibit tetragonal phase as confirmed by X-ray diffraction and Raman spectra. Using XRD data, the crystallite size of undoped and Ag-doped BaTiO3 nanoparticles (NPs) was found to be in the range of 46–54 nm, and have interplanar spacing of 0.283 nm as confirmed by HRTEM images. The characteristic peaks occurred at 309, 511 and 717 cm−1 in Raman spectra predicted the formation of tetragonal phase of barium titanate. The calculated band gap energy of BaTiO3 NPs was reduced from 3.87 to 3.47 eV by incorporating the silver ions (5% Ag). Intensity of photoluminescent peaks decrease with increasing Ag content indicating that recombination of electrons-holes was effectively restrained. Dielectric permittivity as well as loss of prepared nanosized particles have been decreased sharply in low frequency region and remained almost constant with low value in high frequency region. Photo-assisted-catalytic property of Ag-doped BaTiO3 NPs towards degradation of hazardous rhodamine B (RhB) dye under visible irradiation (λ ≥ 400 nm) was thoroughly investigated, and a remarkable photocatalytic activity of Ag (5%)-doped BaTiO3 NPs was observed as 79%. On this account, it is promoted as an excellent nanophotocatalyst for the degradation of organic pollutants. C–V analysis depicted that the diffusion coefficient of BaTiO3 NPs increases considerably with Ag incorporation, which is favourable for large–scale energy storage applications. BET analysis supported the claim of presently prepared materials to be an efficient photocatalyst as well as a potential material for efficient energy storage devices.

中文翻译：

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银掺杂对Ag掺杂BaTiO3陶瓷结构、光学和光催化性能的影响

摘要 本文研究了采用溶胶凝胶技术制备的不同银含量（1、3、5 mol %）修饰的单分散银掺杂 BaTiO3 纳米颗粒的微观结构、光学、介电、光催化和电化学性能。执行。获得的样品表现出四方相，如 X 射线衍射和拉曼光谱所证实。使用 XRD 数据，发现未掺杂和掺杂 Ag 的 BaTiO3 纳米粒子 (NPs) 的微晶尺寸在 46-54 nm 的范围内，并且如 HRTEM 图像所证实的那样具有 0.283 nm 的面间距。在拉曼光谱中出现在 309、511 和 717 cm-1 处的特征峰预测了钛酸钡四方相的形成。通过掺入银离子（5% Ag），计算出的 BaTiO3 NPs 的带隙能量从 3.87 eV 降低到 3.47 eV。光致发光峰的强度随着Ag含量的增加而降低，表明电子-空穴的复合得到有效抑制。介电常数以及制备的纳米尺寸颗粒的损失在低频区域急剧下降，并在高频区域保持几乎恒定的低值。深入研究了掺银 BaTiO3 NPs 在可见光照射下（λ ≥ 400 nm）降解有害罗丹明 B (RhB) 染料的光辅助催化性能，并充分研究了掺 Ag (5%) BaTiO3 NPs 的显着光催化活性观察到为 79%。因此，它被推广为一种用于降解有机污染物的优良纳米光催化剂。C-V 分析表明 BaTiO3 NPs 的扩散系数随着 Ag 的掺入而显着增加，这有利于大规模储能应用。BET 分析支持目前制备的材料是一种高效的光催化剂以及用于高效储能装置的潜在材料的说法。