Abstract
Silver (Ag) supported SiO2 nanocomposite is synthesized at low temperature (80 °C) by sol-gel method. The phenol red (PR) dye is encapsulated in Ag-supported SiO2 (PR/Ag-SiO2) nanocomposite for pH sensing at dynamic pH range 12. The PR/Ag-SiO2 nanocomposite possessed a crack-free porous nanostructure, crystallite size around 49 nm, large surface area (SBET) ∼ 437 m2g−1, and thermal stability at ≤ 400 °C. The PR/Ag-SiO2 exhibited pKa (negative log of the acid dissociation constant)10.9 at 558 nm, color response ∼ 0.46 s in pH 12, repeatability without any leaching traces. Experimental findings suggest that PR/Ag-SiO2 has the potential for extreme aqueous media sensing for daily life applications.
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