Fabrication of Periodically Ordered MnO2 Arrays Decorated with Au Nanoparticles for Interference Enhanced SPR-Mediated Visible-Light Responsive Photocatalysis

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-11-25 DOI:10.1007/s10562-024-04886-6

Jiale Wang, Jie Deng, Han Liu, Guowei Deng, Jiaxing Li, Zhihao Chai, Xiaoyun Liu, Gang Yang

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引用次数: 0

Abstract

Periodically ordered δ-MnO₂ arrays were fabricated by polystyrene (PS) nanosphere lithography combined with following hydrothermal synthesis. The periodicity of δ-MnO₂ arrays was varied by choosing PS nanospheres of different diameters. Then Au nanoparticles (NPs) were deposited on the δ-MnO₂ units to form Au-MnO₂ arrays samples. The PATP-to-DMAB model reaction was applied to detect the influence of MnO₂ units periodicity on surface plasmon resonance (SPR)-mediated photocatalytic performance of Au-MnO₂ arrays samples under 633 nm irradiation. The photocatalytic performance on the Au-MnO₂ array sample of 500 nm period presented ~ 16% superior photocatalytic activities relative to that of Au-MnO₂ array sample of 800 nm period. The surface plasmon polaritons (SPP) of plasmonic NPs can change the propagation path of incident light to vertical direction after scattering on them. The Au-MnO₂ array sample of 500 nm period possessed the distance between neighbor MnO₂ units smaller than the wavelength of irradiation light, and thus the scattered light interfered with each other after the incident light was scattered by the Au NPs on the neighbor MnO₂ units. Then the electric field (E-field) intensities near Au NPs were elevated due to the interference effect. Since the SPR-mediated photocatalytic activity is proportional to the square value of local E-field intensity (E²), thus the photocatalytic activities on Au NPs were enhanced. Therefore, our finding may provide a novel avenue to design SPR-enhanced photocatalysts by the deposition of plasmonic metals on periodically ordered arrays.

Graphical Abstract

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用金纳米粒子装饰的周期有序二氧化锰阵列的制备，用于干扰增强型 SPR 介导的可见光响应光催化技术

通过聚苯乙烯（PS）纳米球光刻技术结合水热合成法，制备了周期有序的 δ-MnO2 阵列。通过选择不同直径的 PS 纳米球来改变 δ-MnO2 阵列的周期性。然后在 δ-MnO2 单元上沉积金纳米颗粒 (NPs)，形成 Au-MnO2 阵列样品。在 633 纳米波长照射下，应用 PATP 到 DMAB 模型反应来检测 MnO2 单元周期性对表面等离子体共振（SPR）介导的 Au-MnO2 阵列样品光催化性能的影响。周期为 500 nm 的 Au-MnO2 阵列样品的光催化活性比周期为 800 nm 的 Au-MnO2 阵列样品高出约 16%。等离子体 NPs 的表面等离子体极化子（SPP）可以改变入射光在其上散射后向垂直方向的传播路径。周期为 500 nm 的 Au-MnO2 阵列样品中，相邻 MnO2 单元之间的距离小于照射光的波长，因此入射光经相邻 MnO2 单元上的 Au NPs 散射后，散射光会相互干扰。在干涉效应的作用下，Au NPs 附近的电场（E-field）强度升高。由于 SPR 介导的光催化活性与局部电场强度（E2）的平方值成正比，因此 Au NPs 上的光催化活性得到了增强。因此，我们的发现可能为通过在周期性有序阵列上沉积等离子体金属来设计 SPR 增强型光催化剂提供了一条新途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.