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Fast responsive thermally stable silica microspheres for sensing evaluation: sol–gel approach
Journal of Sol-Gel Science and Technology ( IF 2.3 ) Pub Date : 2020-07-16 , DOI: 10.1007/s10971-020-05366-0
Shumaila Islam , Hazri Bakhtiar , Adil Alshoaibi , Zuhaib Haider , Saira Riaz , Shahzad Naseem

Cetyltrimethylammonium bromide (CTAB) micelle-templated mesoporous SiO2 particles (MSPs) are synthesized by sol–gel method. The CTAB templated SiO2 particles (SPs) possessed spherical structure with low average surface roughness (Ra) 1 nm. The CTAB template is effectively removed from SPs by 400 °C heat treatment without any cracks and disruption of the bonding between the functional groups and the SiO2 surface. After CTAB template removal, SiO2 microspheres (SMSs) possessed high surface area 640 m2/g, pore radius 10 nm, and Ra ~ 4.4 nm, making them highly attractive for sensing. Thermal gravimetric analysis (TGA) confirmed that SMSs are thermally stable, showing 0.7% weight loss after 429 °C temperature. Phenol red immobilized SMSs show large pKa value 8.1 at 560 nm. Good repeatability, no leaching traces, and fast response time ~0.09 s in basic media suggested that proposed material has potential for opto-chemical sensing/photonic applications.



中文翻译:

快速响应的热稳定二氧化硅微球用于传感评估:溶胶-凝胶法

十六烷基三甲基溴化铵(CTAB)胶束模板的介孔SiO 2颗粒(MSPs)是通过溶胶-凝胶法合成的。CTAB模板化的SiO 2颗粒(SPs)具有球形结构,平均表面粗糙度(Ra)低至1 nm。CTAB模板可通过400°C的热处理有效地从SP中去除,而不会出现任何裂纹和官能团与SiO 2表面之间的键合破裂。去除CTAB模板后,SiO 2微球(SMS)具有640 m 2的高表面积/ g,孔半径10 nm和Ra〜4.4 nm,使它们在传感方面极具吸引力。热重分析(TGA)确认SMS是热稳定的,在429°C温度下失重0.7%。苯酚红固定的SMS在560 nm处显示出较大的pKa值8.1。良好的重复性,无浸出痕迹以及在基本介质中的〜0.09 s的快速响应时间表明所提出的材料具有光化学传感/光子应用的潜力。

更新日期:2020-07-16
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