ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 66, (2) 167 - 177 (2022)


STRUCTURE AND PROPERTIES OF SILVER-SILICA COMPOSITE PREPARED FROM RICE HUSK SILICA AND SILVER NITRATE
 
Sembiring Simon 1, Riyanto Agus 1, Firdaus Iqbal 1, Junaidi 1, Situmeang Rudy 2
 
1 Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung, Jl. Prof. Soemantri Brojonegoro, Bandar Lampung, Indonesia 35145
2 Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Lampung, Jl. Prof. Soemantri Brojonegoro, Bandar Lampung, 35145, Indonesia

Keywords: Rice husk, Silver, Band gap, Structure, Microstructure, Ag-SiO₂ composite
 

This research characterises the structure and physical properties of silver/silica (Ag/SiO₂) composites using silver nitrate (AgNO₃) and rice husk silica sols as precursors. The Ag/SiO₂ composites were produced with different AgNO3 concentrations (0.3-0.8M) heated to a temperature of 850 °C. All the composites were fully characterised in the solid state via various techniques; Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microcopy/Energy Dispersive Spectroscopy (SEM/EDS), Thermal Gravimetry Analysis/Differential Thermal Analysis (TGA/DTA) were used to investigate the effects of changes in the sol concentration on the crystalline of Ag/SiO₂ composites. In addition, a Particle Size Analysis (PSA) and a UV-visible technique were used to measure the particle size distribution and band gap energy, respectively. The X-ray diffraction (XRD) showed cristobalite and Ag face-centre-cubic (fcc) structures, indicating the deposition of the Ag particles on the SiO₂ surfaces. The particle size distributions were found to be in a range of 0.01-0.42 μm and 0.49-3.43 μm, followed the band gap energies in a range of 1.97 to 2.17 eV, and 3.63 to 3.57 eV. As a result, the Ag/SiO₂ composite promises to be a great biomedical material degrading high antibacterial properties.


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doi: 10.13168/cs.2022.0011
 
 
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