Composite Silica‐Based Films as Platforms for Electrochemical Sensors

Abstract

Sol‐gel‐derived silica thin films generated onto electrode surfaces in the form of organic‐inorganic hybrid coatings or other composite layers have found tremendous interest for being used as platforms for the development of electrochemical sensors and biosensors. After a brief description of the strategies applied to prepare such materials, and their interest as electrode modifier, this review will summarize the major advances made so far with composite silica‐based films in electroanalysis. It will primarily focus on electrochemical sensors involving both non‐ordered composite films and vertically oriented mesoporous membranes, the biosensors exploiting the concept of sol‐gel bioencapsulation on electrode, the spectroelectrochemical sensors, and some others.

Innovative Applications of Cerium Oxide-Based Materials in Civil Engineering, Automation, and Energy Sectors

“…This approach was further enhanced, leading to the development of sol-gelderived CeO 2 -TiO 2 -SiO 2 humidity sensors with remarkable properties [238,239]. The introduction of CeO 2 nanoparticles into a polymer matrix is also employed for the development of advanced biosensors [240,241].…”

“…Another approach to enhance the sensing ability of CeO 2 -based materials involves modifying their lattices by doping with other elements [25, [240][241][242]. The zinc oxide (ZnO) modification by Ce is particularly attractive, as the treatment of ZnO/TiO 2 solgel-derived film at 400°C results in the formation of the simonkolleite phase, which possesses exceptional hygroscopicity [243].…”

Ultrasensitive detection of dopamine using Au microelectrodes integrated with mesoporous silica thin films

“…[17][18][19] The features of high mechanical strength, chemical stability and biocompatibility of the mesoporous silica membrane offer high suitability for applications in electrochemical sensing and biosensing. 18,[20][21][22][23] In particular, the mesoporous silica thin films prepared by the electrochemically assisted selfassembly (EASA) approach possess highly ordered mesopore structures perpendicular to an electrode surface, 24,25 the EASA method is straightforward and efficient, and the films exhibit excellent molecular sieving properties and charge permselectivity. As far as we know, the current electrochemical analyses with modified mesoporous silica thin films are largely based on macroscopic electrode substrates such as Au film, 6 carbon electrodes 26 and indium tin oxide (ITO), 27 where the redox current is controlled by a mix of diffusion and adsorption.…”