rGO-TiO 2纳米复合材料增强气敏特性：合成、结构、光学表征及环境监测灵敏度分析

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-06-01 DOI:10.1016/j.ceramint.2025.02.159

Girish Murlidhar Rajguru , Rakesh Kumar Mishra , Vijay S. Raykar , Pankaj P. Khirade

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引用次数: 0

摘要

采用改进的Hummers方法合成氧化石墨烯（GO），采用溶胶-凝胶法制备二氧化钛（TiO2）纳米颗粒。然后将这些纳米颗粒水热混合制成rGO-TiO2纳米复合材料，其中含有金红石、锐钛矿和板岩相的TiO2以及不同氧化水平的还原氧化石墨烯（rGO）。采用不同的rGO:TiO2浓度比（10:0、7.5:2.5、5:5、2.5:7.5和0:10），制备出了均匀分散在rGO薄片上的rGO-TiO2纳米复合材料。根据Williamson-Hall外推法，TiO2浓度越高，平均晶粒尺寸从15.48 nm增加到35.08 nm。FTIR分析显示，纳米复合材料的六方相和四方相都存在官能团。hrtem分析表明TiO2粒径分布均匀，在204 ~ 210 nm处达到峰值。拉曼光谱证实了rGO的结构完整和锐钛矿TiO2的存在，能带隙为3.67 eV。与其他气体（如H2S、CO和NH3）相比，气敏特性突出了对NO2的敏感性。结果表明，较高的还原氧化石墨烯含量显著提高了传感器的响应性和恢复动力学，使这些复合材料成为环境监测和工业安全应用中有害NO2气体检测的有希望的候选者。

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Enhanced gas sensing characteristics of rGO-TiO₂ nanocomposites: Synthesis, structural, optical characterization and sensitivity analysis for environmental monitoring

The modified Hummers' method was employed to synthesize graphene oxide (GO), while titanium dioxide (TiO₂) nanoparticles were produced using the sol-gel process. These nanoparticles were then hydrothermally blended to create rGO-TiO₂ nanocomposites, which contain rutile, anatase, and brookite phases of TiO₂ alongside varying oxidation levels of reduced graphene oxide (rGO). The synthesis successfully yielded rGO-TiO₂ nanocomposites with uniformly dispersed TiO₂ nanoparticles on rGO sheets, using with varying concentration ratios of rGO:TiO₂ (10:0, 7.5:2.5, 5:5, 2.5:7.5, and 0:10). The average crystallite size increased from approximately 15.48 to 35.08 nm with higher TiO₂ concentrations, as supported by Williamson-Hall extrapolation. FTIR analysis revealed functional groups associated with both the hexagonal and tetragonal phases of the nanocomposite. HR-TEM analysis indicated a uniform TiO₂ particle size distribution, peaking at 204–210 nm. The Raman spectra confirmed the structural integrity of rGO and the presence of anatase TiO₂, with an energy band gap of ∼3.67 eV. The gas sensing characteristics highlighted enhanced sensitivity to NO₂ compared to other gases such as H₂S, CO, and NH₃. The results demonstrate that higher rGO content significantly improves the sensor's responsiveness and recovery dynamics, making these composites promising candidates for hazardous NO₂ gas detection in environmental monitoring and industrial safety applications.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.