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Monitoring Chemical Reactions with SERS-Active Ag-Loaded Mesoporous TiO2 Films.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-09-21 , DOI: 10.1021/acs.analchem.0c03310
M Mercedes Zalduendo 1 , Víctor Oestreicher 1, 2 , Judith Langer 3 , Luis M Liz-Marzán 3, 4 , Paula C Angelomé 1
Affiliation  

Monitoring chemical reactions that occur in small spaces or confined environments is challenging. Surface-enhanced Raman scattering (SERS) spectroscopy offers the unique possibility to monitor spectral changes with high sensitivity and time resolution. Herein, we report the application of composite mesoporous TiO2 films loaded with Ag nanoparticles (NPs) to track in situ chemical processes in real time. In particular, the AgNPs@TiO2 system was employed to monitor two chemical reactions: one occurring on the Ag NPs surface and another taking place in the surrounding solution. In the first case, we monitored the decarboxylation reaction of 4-mercaptobenzoic acid on Ag NPs, which allowed us to identify the conditions that favor it. In the second case, we studied the pH evolution in the nanocavities during a homogeneous alkalization process driven by chloride-assisted glycidol rupture (the Epoxide Route) and compared it with pH measurements by conventional techniques. We therefore demonstrated that the proposed nanodevice provides an excellent performance to monitor dynamic processes occurring either inside the material or in the solution in which it is immersed.

中文翻译:

监测具有SERS活性银负载介孔TiO2薄膜的化学反应。

监视在狭小空间或狭窄环境中发生的化学反应具有挑战性。表面增强拉曼散射(SERS)光谱提供了以高灵敏度和高时间分辨率监视光谱变化的独特可能性。本文中,我们报道了负载有Ag纳米颗粒(NPs)的复合中孔TiO 2薄膜在实时跟踪原位化学过程中的应用。特别是AgNPs @ TiO 2该系统用于监测两种化学反应:一种发生在银纳米颗粒表面,另一种发生在周围溶液中。在第一种情况下,我们监测了4-巯基苯甲酸在Ag NP上的脱羧反应,这使我们能够确定有利于它的条件。在第二种情况下,我们研究了在由氯化物辅助的缩水甘油破裂(环氧化物途径)驱动的均匀碱化过程中,纳米腔内的pH演变,并将其与常规技术的pH测量值进行了比较。因此,我们证明了所提出的纳米器件提供了出色的性能,可以监视材料内部或浸入其中的溶液中发生的动态过程。
更新日期:2020-09-21
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