Redox-Active Silica Nanoparticles. Part 1. Electrochemistry and Catalytic Activity of Spherical, Nonporous Silica Particles with Nanometric Diameters and Covalently Bound Redox-active Modifications^,

Abstract

Nonporous spherical silica nanoparticles resulting from a controlled Stöber process are covalently surface modified with redox-active molecules. Ferrocene, a ruthenium(II) complex with an N2P2Cl2 ligand set, and a sterically hindered biphenylamine are used as modifiers. The resulting materials are characterized by physical, spectroscopic, electrochemical, and chemical methods. The cyclic voltammetric behavior is studied in detail and reveals effects of charge transport by electron hopping along the surface of particles adsorbed on a Pt electrode. The ruthenium(II) complex remains catalytically active with respect to hydrogenation upon immobilization on the particles. Thus, the respective material provides a heterogenized homogeneous hydrogenation catalyst on a solid support.

An improved non-enzymatic hydrogen peroxide sensor based on europium functionalized inorganic hybrid material—Evaluation of optical and electrochemical properties

“…Dai et al [43] reported the acceleration of electron transfer by SBA-15 type mesoporous materials to the surface of electrode. In the similar lines results were obtained in the other series of mesoporous silica [44][45][46] and this can be ascribed to the electron hopping mechanism that aid for the electron transfer inside silica mesopores [43,[47][48][49].…”

Synthesis of nanosilica‐based immobile antioxidant and its antioxidative efficiency in SBR composites

“…Nanosilica has been widely used as inorganic filler in many polymeric materials, for it has been regarded as a promising material that can be functioned through the active hydroxyls on its surface [24][25][26][27][28][29][30][31]. However, literature concerning application of nanosilica-grafted aromatic amine as immobilized antioxidant for SBR is finite.…”

Stepwise Solid‐Phase Synthesis and Solid‐State Electrochemistry of Redox‐Active Viologen Core/Shell‐Structured Modified Silica Materials

“…The preparation of ferrocene‐terminated indium tin oxide,33 gold,34 and silica35–37 particles was reported recently. In particular, monodisperse and nonporous spherical Stöber silica particles are well established as solid supports38–42 and provide a defined geometry and surface environment. Under thoroughly controlled reaction conditions, spheres with predictable diameters are formed 41…”