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<p>To enable efficient phenol red (PR) sensing over a wide pH range (1–12), copper oxide nanoparticle (CNPs) decorated anatase-silica (CAS) nanocomposite and gold nanoparticle (AuNPs) decorated anatase-silica (AAS) nanocomposite were synthesized by a sol–gel method at 80 °C. The AAS nanocomposite possessed a higher surface area ~251 m²/g and smaller crystallite size ~4 nm compared to the CAS nanocomposite surface area ~215 m²/g and crystallite size ~10 nm. In sensing analysis, PR encapsulated AAS (PR-AAS) exhibited a larger pKa around 10.8 and color response time (Ta) ~0.2 s at pH 12 than PR encapsulated CAS (PR-CAS). These results suggest PR-AAS nano composite sol is an excellent nanocomposite for swift and reliable pH sensing in environmental and food monitoring.</p> Graphical Abstract <p></p>

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Optically activated mesoporous CuO and AuNPs decorated anatase-silica nanocomposite sol for ultra-fast pH sensing

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Shumaila Islam,
  • Adil Alshoaibi

摘要

To enable efficient phenol red (PR) sensing over a wide pH range (1–12), copper oxide nanoparticle (CNPs) decorated anatase-silica (CAS) nanocomposite and gold nanoparticle (AuNPs) decorated anatase-silica (AAS) nanocomposite were synthesized by a sol–gel method at 80 °C. The AAS nanocomposite possessed a higher surface area ~251 m²/g and smaller crystallite size ~4 nm compared to the CAS nanocomposite surface area ~215 m²/g and crystallite size ~10 nm. In sensing analysis, PR encapsulated AAS (PR-AAS) exhibited a larger pKa around 10.8 and color response time (Ta) ~0.2 s at pH 12 than PR encapsulated CAS (PR-CAS). These results suggest PR-AAS nano composite sol is an excellent nanocomposite for swift and reliable pH sensing in environmental and food monitoring.

Graphical Abstract