Surface functionalization of MnO2 NW embellished with metal nanoparticles for self-cleaning applications

IF 3.674 4区工程技术 Q1 Engineering Applied Nanoscience Pub Date : 2024-02-21 DOI:10.1007/s13204-024-03032-3

Stacy A. Lynrah, P. Chinnamuthu, Rajshree Rajkumari, Ying Ying Lim, Lanusubo Walling, L. Vigneash

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Abstract

The present study investigates the synthesis of vertically aligned MnO₂ nanowires (NW) decorated with gold (Au) and silver (Ag) nanoparticles (NP) via the glancing angle deposition (GLAD) technique without a need for a catalyst. The cross-sectional field emission scanning electron microscopy (FESEM) image and energy-dispersive X-ray spectroscopy (EDS) confirm the successful adornment of Ag NP and Au NP on the top surface of MnO₂ NW. Elemental mapping has verified the presence of manganese (Mn), oxygen (O), silicon (Si), Ag, and Au within the sample. X-ray diffraction (XRD) patterns reveal the polycrystalline growth of the MnO₂ film with the preferred orientation. AFM reveals that the surface roughness of Au NP/MnO₂ NW is more than Ag NP/MnO₂ NW. The measured water contact angles of Au NP/MnO₂ NW, Ag NP/MnO₂ NW, and MnO₂ NW were 125° and 113°, respectively. Ag NP/MnO₂ NW showed more hydrophilic properties under UV illumination than Au NP/MnO₂ NW owing to the efficient separation of photogenerated electron–hole pairs. Ag NP/MnO₂ NW’s higher photocatalytic activity than Au NP/MnO₂ NW is attributed to the increased light absorption of the Ag NP in the UV region. The overall enhancement after decorating the noble metal NP on MnO₂ NW could open new avenues for self-cleaning applications.

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缀有金属纳米颗粒的 MnO2 NW 表面功能化，用于自清洁应用

本研究探讨了在无需催化剂的情况下，通过闪烁角沉积（GLAD）技术合成装饰有金（Au）和银（Ag）纳米粒子（NP）的垂直排列的二氧化锰纳米线（NW）。横截面场发射扫描电子显微镜（FESEM）图像和能量色散 X 射线光谱（EDS）证实，在 MnO2 NW 的顶面成功装饰了银纳米粒子和金纳米粒子。元素图谱验证了样品中锰（Mn）、氧（O）、硅（Si）、银和金的存在。X 射线衍射 (XRD) 图显示了 MnO2 薄膜的多晶生长和优选取向。原子力显微镜（AFM）显示，Au NP/MnO2 NW 的表面粗糙度大于 Ag NP/MnO2 NW。测得的 Au NP/MnO2 NW、Ag NP/MnO2 NW 和 MnO2 NW 的水接触角分别为 125°和 113°。在紫外线照射下，Ag NP/MnO2 NW 比 Au NP/MnO2 NW 表现出更强的亲水性，这是因为光生电子-空穴对的有效分离。Ag NP/MnO2 NW 的光催化活性高于 Au NP/MnO2 NW 是因为 Ag NP 在紫外区的光吸收增加。在 MnO2 NW 上装饰贵金属 NP 后，其整体性能得到增强，这为自清洁应用开辟了新的途径。

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来源期刊

Applied Nanoscience Materials Science-Materials Science (miscellaneous)

CiteScore

7.10

自引率

0.00%

发文量

430

期刊介绍： Applied Nanoscience is a hybrid journal that publishes original articles about state of the art nanoscience and the application of emerging nanotechnologies to areas fundamental to building technologically advanced and sustainable civilization, including areas as diverse as water science, advanced materials, energy, electronics, environmental science and medicine. The journal accepts original and review articles as well as book reviews for publication. All the manuscripts are single-blind peer-reviewed for scientific quality and acceptance.