Synthesis and characterization of sol-gel processed GO/NiO hybrid composites for gas sensing and photocatalytic applications

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

Journal of Sol-Gel Science and Technology Pub Date : 2025-04-04 DOI:10.1007/s10971-025-06734-4

Agnes C. Nkele, Adil Alshoaibi, Femi D. Matthew, Chawki Awada, Shumaila Islam, Fabian I. Ezema

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Abstract

This study focused on synthesizing and characterizing a hybrid composite of graphene oxide (GO) and nickel oxide (NiO) prepared by a sol-gel technique. The nanocomposite was characterized to investigate the structural, morphological, optical, chemical, electrical, photocatalytic, and gas-sensing properties via diverse techniques. These characterizations produced prominent crystalline peaks, a direct energy band gap value of 1.76 eV, characteristic absorption bands, and even distributed nanopebbles. The electrical and gas sensing measurements were conducted at 10 V and 100 ppm concentration under exposure to a liquefied petroleum gas (LPG). The composites showed high sensitivity to LPG at an operating temperature of 400 °C. Upon further exposure to methylene blue at an illumination intensity of 80 W/m², the composites exhibited more than 90 percent photocatalytic efficiency over a degradation period of 120 min. These results highlight the multifunctional capabilities of the synthesized hybrid nanocomposites, suggesting promising applications in gas sensing and photocatalytic degradation processes.

Graphical Abstract

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气敏和光催化氧化石墨烯/氧化镍杂化复合材料的合成与表征

采用溶胶-凝胶法制备了氧化石墨烯（GO）和氧化镍（NiO）的杂化复合材料，并对其进行了表征。通过各种技术对纳米复合材料的结构、形态、光学、化学、电学、光催化和气敏性能进行了表征。这些表征产生了明显的晶体峰，直接能带隙值为1.76 eV，特征吸收带和均匀分布的纳米气泡。在暴露于液化石油气（LPG）下，在10 V和100 ppm的浓度下进行电和气敏测量。在400℃的工作温度下，复合材料对LPG具有较高的灵敏度。进一步暴露在照明强度为80 W/m2的亚甲基蓝下，复合材料在120分钟的降解时间内表现出超过90%的光催化效率。这些结果突出了合成的杂化纳米复合材料的多功能能力，表明其在气体传感和光催化降解过程中的应用前景广阔。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.