Excellent photocatalytic activity of ZnO-NiO heterojunction thin film in the sunlight range with enhanced of UV photodetection behavior

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2025-03-13 DOI:10.1007/s10971-025-06728-2

Meriem Gasmi, Abdelkader Djelloul, Sabrina Iaiche, Khemissi Lahouel, Nilgun Baydogan

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Abstract

Herein, we investigated the photocatalytic activity and photoresponse of pristine ZnO and NiO, as well as ZnO-NiO heterojunction grown by the sol-gel dip-coating method on glass substrates. The obtained samples were characterized via X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), high-resolution atomic force microscopy (AFM), and UV–vis spectroscopy. Structural, optical, and morphological studies have demonstrated the presence of two phases of zinc and nickel oxides. The photocatalytic activity of the coatings was evaluated by methylene blue (MB) degradation under natural sunlight illumination for 150 min. The p-n ZnO-NiO heterojunction enhanced the degradation rates, exhibiting superior photocatalytic activity by degrading 96.73% in 150 min compared to pristine ZnO (74.56%), and pristine NiO (42.83%). Furthermore, the thin film demonstrated higher stability, reusability, and recoverability after five cyclic tests, rendering it suitable for wastewater purification. Based on the sensitivity, responsivity, and detectivity of the ZnO-NiO heterojunction sample to light, exposure to UV light irradiates the photocatalysts to generate electrons and holes, thus inducing a photocurrent.

Graphical Abstract

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ZnO-NiO异质结薄膜在日光范围内具有优异的光催化活性，增强了紫外光探测行为

在此，我们研究了原始ZnO和NiO的光催化活性和光响应，以及通过溶胶-凝胶浸渍法在玻璃衬底上生长的ZnO-NiO异质结。通过x射线衍射（XRD）、场发射扫描电镜（FE-SEM）、能量色散x射线能谱（EDS）、高分辨率原子力显微镜（AFM）和紫外可见光谱对所得样品进行了表征。结构、光学和形态学研究表明锌和镍氧化物存在两相。在自然光照150 min的条件下，通过亚甲基蓝（MB）降解来评价涂层的光催化活性。p-n ZnO-NiO异质结提高了降解率，在150 min内降解率达到96.73%，高于原始ZnO（74.56%）和原始NiO（42.83%）。此外，经过五次循环试验，该薄膜表现出较高的稳定性、可重复使用性和可恢复性，适用于废水净化。基于ZnO-NiO异质结样品对光的灵敏度、响应性和探测性，在紫外光照射下，光催化剂会产生电子和空穴，从而产生光电流。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.