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Abstract <p>Modified optical behavior of silver (Ag)-treated diatom frustules in comparison to untreated frustules is reported. Simple physical vapor deposition (PVD) technique is used to deposit Ag nanoparticles (AgNPs) on diatom frustules. Scanning electron microscopic (SEM) images and energy dispersive X-ray (EDX) spectra reveal that the amorphous silica structure is coated by crystalline AgNPs which is further confirmed by the narrow spike in the X-ray diffraction (XRD) spectra for Ag-coated frustules. A shifting of UV–visible spectra peak from 277 to 319&#xa0;nm is attributed to the formation of AgNPs. The broad photoluminescence (PL) signal centered at blue region (448&#xa0;nm) in uncoated frustules is completely overlapped and manipulated by different other peaks centered at predominantly blue region (423&#xa0;nm, 449&#xa0;nm) along with blue–green (490&#xa0;nm), green (534&#xa0;nm), and orange (601&#xa0;nm) band emission in the Ag-coated frustules. The work illuminates the inspiring applications of modified structure of diatom frustules toward its various optical properties in nano-dimension.</p> Graphical abstract <p></p>

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Optical characterization of silver nanoparticles deposited diatom frustules

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Debabrat Kalita,
  • Lakhi Chetia

摘要

Abstract

Modified optical behavior of silver (Ag)-treated diatom frustules in comparison to untreated frustules is reported. Simple physical vapor deposition (PVD) technique is used to deposit Ag nanoparticles (AgNPs) on diatom frustules. Scanning electron microscopic (SEM) images and energy dispersive X-ray (EDX) spectra reveal that the amorphous silica structure is coated by crystalline AgNPs which is further confirmed by the narrow spike in the X-ray diffraction (XRD) spectra for Ag-coated frustules. A shifting of UV–visible spectra peak from 277 to 319 nm is attributed to the formation of AgNPs. The broad photoluminescence (PL) signal centered at blue region (448 nm) in uncoated frustules is completely overlapped and manipulated by different other peaks centered at predominantly blue region (423 nm, 449 nm) along with blue–green (490 nm), green (534 nm), and orange (601 nm) band emission in the Ag-coated frustules. The work illuminates the inspiring applications of modified structure of diatom frustules toward its various optical properties in nano-dimension.

Graphical abstract