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

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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 map** 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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Data availability

The datasets generated and analyzed during the current study are available in the Applied Nanoscience. Access to these data is open, upon request or after publication. For inquiries or requests related to the data, please contact the corresponding author at chinnamuthu@nitnagaland.ac.in.

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Acknowledgements

The author would like to acknowledge NIT Nagaland for providing us with the necessary facilities like XRD measurement from the Department of Physics to carry out this work. Furthermore, they are also grateful to the Tokyo City University and the Sone Scholarship fund from the Gotoh Educational Corporation.

Funding

The funding agency for this work is the Science and Engineering Research Board (SERB), Department of Science & Technology (DST), Government of India, (EEQ/2021/000507).

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, NIT Nagaland, Dimapur, 797103, India

    Stacy A. Lynrah, P. Chinnamuthu & Lanusubo Walling

  2. Department of Electronics and Communication Engineering, Indian Institute of Information Technology Senapati, Manipur, 795002, India

    Rajshree Rajkumari

  3. Department of Electrical, Electronic and Communication Engineering, Tokyo City University, Tokyo, 158‑8557, Japan

    Ying Ying Lim

  4. Department of Electronics and Communication Engineering, Arjun College of Technology, Coimbatore, Tamil Nadu, 642120, India

    L. Vigneash

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  1. Stacy A. Lynrah
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Correspondence to P. Chinnamuthu.

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Lynrah, S.A., Chinnamuthu, P., Rajkumari, R. et al. Surface functionalization of MnO2 NW embellished with metal nanoparticles for self-cleaning applications. Appl Nanosci 14, 519–529 (2024). https://doi.org/10.1007/s13204-024-03032-3

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