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<p>Sol-gel-based zincite-supported silver (Ag) doped SiO<sub>2</sub> (Z-AgS) nanocrystallites (NC) were synthesized at low temperatures (80 °C). For pH sensing across a pH range of 1 to 12, phenol red (PR) dye was encapsulated within the Z-AgS matrix (PR/Z-AgS). The PR/Z-AgS exhibited a porous nanostructure, crystallite size of approximately 20 nm, a substantial surface area (S<sub>BET</sub>) of about 192 m<sup>2</sup>g<sup>−1</sup>, and excellent thermal stability. The encapsulated PR exhibited a pKa around 8, which was substantially higher than that of the unencapsulated dye due to interactions between the dye molecule and the matrix surface. A rapid response time of ~0.3 s was obtained at pH 12, and no leaching of the PR from the matrix was evident over a two-day period. These findings highlight the potential of PR/Z-AgS for pH sensing in aqueous media.</p> Graphical Abstract <p></p>

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Optically activated Zincite supported Ag/SiO2 nanocrystallites for naked-eye pH sensing

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Shumaila Islam

摘要

Sol-gel-based zincite-supported silver (Ag) doped SiO2 (Z-AgS) nanocrystallites (NC) were synthesized at low temperatures (80 °C). For pH sensing across a pH range of 1 to 12, phenol red (PR) dye was encapsulated within the Z-AgS matrix (PR/Z-AgS). The PR/Z-AgS exhibited a porous nanostructure, crystallite size of approximately 20 nm, a substantial surface area (SBET) of about 192 m2g−1, and excellent thermal stability. The encapsulated PR exhibited a pKa around 8, which was substantially higher than that of the unencapsulated dye due to interactions between the dye molecule and the matrix surface. A rapid response time of ~0.3 s was obtained at pH 12, and no leaching of the PR from the matrix was evident over a two-day period. These findings highlight the potential of PR/Z-AgS for pH sensing in aqueous media.

Graphical Abstract