Influence of copper and cobalt ions co–doping on structural, optical and dielectric properties of nanostructured anatase titanium dioxide

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2025-08-12 DOI:10.1007/s10971-025-06888-1

Yogita Verma, Puneet Negi, Ruhit Jyoti Konwar, Hemaunt Kumar, Gagandeep Kaur, Priyanka Rani, Shailja, Anchal Sharma, Gursimran Kaur, Apexa Maru, Himanshu Dadhich, Keval Gadani, N. A. Shah, P. S. Solanki

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引用次数: 0

Abstract

The pristine anatase titanium dioxide (TiO₂) and transition metal (i.e. Cu and Co) co–doped anatase titanium dioxide nanoparticles (Ti_0.988Cu_0.002Co_0.01O₂) were synthesized using sol–gel auto–combustion technique. Structural, optical and dielectric properties have been studied to understand the effect of dopants across TiO₂ lattice. X–ray diffraction (XRD) and Rietveld refinements confirm the formation of tetragonal structure having I4₁/amd space group, and crystallite size for co–doped TiO₂ nanoparticles falls ~12.68 nm which has been further verified by Raman spectroscopy. UV visible spectroscopy was performed to estimate the band gap energy that gets reduced from ~3.2 eV for TiO₂ to ~1.7 eV for co–doped TiO₂ nanoparticles. Dielectric constant, dielectric loss and ac conductivity for co–doped TiO₂ sample are explained in terms of crystallite size, related grain boundaries and their nature.

Graphical Abstract

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铜和钴离子共掺杂对纳米锐钛矿型二氧化钛结构、光学和介电性能的影响

采用溶胶-凝胶自燃烧技术合成了原始锐钛矿二氧化钛（TiO2）和过渡金属（Cu和Co）共掺杂锐钛矿二氧化钛纳米粒子（ti0.988 cu0.002 co0.010 o2）。研究了掺杂剂对TiO2晶格的结构、光学和介电性能的影响。x射线衍射（XRD）和Rietveld细化证实了共掺杂TiO2纳米粒子形成了具有I41/amd空间基团的四方结构，晶粒尺寸减小至~12.68 nm，拉曼光谱进一步证实了这一点。用紫外可见光谱法估计了共掺杂TiO2纳米粒子的带隙能从~3.2 eV降至~1.7 eV。从晶粒尺寸、相关晶界及其性质等方面解释了共掺杂TiO2样品的介电常数、介电损耗和交流电导率。图形抽象

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.