Surface plasmon resonance (SPR)-enhanced photocatalytic degradation by periodically ordered δ-MnO2 arrays with alkali metals doping

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2024-08-13 DOI:10.1016/j.solidstatesciences.2024.107659

Han Liu , Mingsong Zhang , Xiaoyun Liu , Zhihao Chai , Mai Li , Chunrui Wang , Jiale Wang

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引用次数: 0

Abstract

Periodically ordered δ-MnO₂ arrays of different periods have been fabricated by using polystyrene (PS) nanosphere lithography (NSL) combined with following hydrothermal growth. By choosing different precursors, δ-MnO₂ arrays with different alkali metals doping were obtained. It was observed that the K-doped δ-MnO₂ array of 500 nm period exhibited superior photocatalytic degradation performance of methylene blue (MB) under visible light irradiation relative to those of Na- or Mg-doped δ-MnO₂ arrays of 500 nm period, as well as K-doped δ-MnO₂ array of 800 nm period. The best performance of K-doped δ-MnO₂ array of 500 nm period can be firstly attributed to enhanced surface plasmon resonance (SPR) effect caused by alkali metal doping, where K-doped MnO₂ could provide more free electrons than those of Na- or Mg- doped MnO₂. Furthermore, for the nanomaterials with SPR effect the surface plasmon polaritons (SPP) can change the propagation path of incident light to vertical direction after scattering on them. Since the MnO₂ array of 500 nm period possessed the distance between neighbor unites smaller than the wavelength of irradiation light, and thus the scattered light interfered with each other after the incident light was scattered by the MnO₂ unites. Then the electric field (E-field) intensities generated by SPR effect near each MnO₂ unit were elevated due to the interference effect. Therefore, our finding may provide a peculiar way to improve SPR-mediated photocatalytic performance of non-metallic materials by combination of doping and arrays fabrication of particular periods.

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掺杂碱金属的周期有序 δ-MnO2 阵列的表面等离子体共振 (SPR) 增强光催化降解作用

通过使用聚苯乙烯（PS）纳米层光刻法（NSL）结合水热生长法，制备出了不同周期的有序δ-MnO2 阵列。通过选择不同的前驱体，得到了掺杂不同碱金属的 δ-MnO2 阵列。研究发现，在可见光照射下，掺杂 K 的 500 nm 周期的 δ-MnO2 阵列对亚甲基蓝（MB）的光催化降解性能优于掺杂 Na 或 Mg 的 500 nm 周期的 δ-MnO2 阵列以及掺杂 K 的 800 nm 周期的 δ-MnO2 阵列。周期为 500 nm 的掺 K δ-MnO2 阵列性能最佳，这首先归因于碱金属掺杂增强了表面等离子体共振（SPR）效应，与掺 Na 或 Mg 的 MnO2 相比，掺 K 的 MnO2 能提供更多的自由电子。此外，对于具有 SPR 效应的纳米材料，表面等离子体极化子（SPP）在其上散射后可将入射光的传播路径改变为垂直方向。由于周期为 500 nm 的二氧化锰阵列的相邻单元之间的距离小于照射光的波长，因此入射光经二氧化锰单元散射后，散射光会相互干扰。在这种干涉效应的作用下，每个二氧化锰单元附近由 SPR 效应产生的电场（E-field）强度就会升高。因此，我们的发现可能为通过掺杂和制造特定周期的阵列来提高非金属材料的 SPR 介导光催化性能提供了一种独特的方法。

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.