Polyethylene glycol-assisted silica nanoparticles (SNPs) matrix is synthesized by the sol-gel method at a low temperature 60 °C. Cresol red is encapsulated in SNPs matrix (CR-SNPs) for sensing evaluation. Different pH (1–10) response on structural, optical, and sensing properties of the synthesized matrix is explored by fundamental techniques. Microscopic analysis shows porous crack-free morphology, uniform distribution of elements, and smooth ultrathin surface. The particle size of a synthesized matrix is increased from 28 nm to 42 nm by increasing the pH from 1 to 10. FTIR analysis confirms the Si–O–Si bonding and CR species bonding in all samples. UV–vis analysis shows 76% transparency, low refractive index 1.22 at 550 nm, and 46% porosity at pH 10. Color reversibility confirms that the synthesized CRS-NPs has stable life. Moreover, CRS-NPs revealed pKa value ∼7 at 518 nm, suggesting smaller degree of dissociation with dynamic sensitivity. Fast time response 0.51s was observed at pH 10.

聚乙二醇辅助二氧化硅纳米粒子 (SNPs) 基质是通过溶胶-凝胶法在 60°C 的低温下合成的。甲酚红封装在 SNP 矩阵 (CR-SNP) 中用于传感评估。通过基本技术探索了对合成基质的结构、光学和传感特性的不同 pH (1-10) 响应。显微分析显示多孔无裂纹形貌，元素分布均匀，超薄表面光滑。通过将 pH 值从 1 增加到 10，合成基质的粒径从 28 nm 增加到 42 nm。FTIR 分析证实了所有样品中的 Si-O-Si 键合和 CR 物质键合。UV-vis 分析显示 76% 的透明度，在 550 nm 下的低折射率为 1.22，在 pH 值为 10 时为 46% 的孔隙率。颜色可逆性证实合成的 CRS-NPs 具有稳定的寿命。而且，CRS-NPs 在 518 nm 处显示 pKa 值 ~7，表明与动态灵敏度的解离程度较小。在 pH 10 下观察到 0.51 秒的快速响应时间。