3-Glycidoxypropyltrimethoxysilane mediated in situ synthesis of noble metal nanoparticles: Application to hydrogen peroxide sensing

Abstract

The in situ synthesis is reported of noble metal nanoparticles via 3-glycidoxypropyltrimethoxysilane mediated reduction of 3-aminopropyltrimethoxysilane treated metal salts during sol-gel processing. The method described involves the synthesis of uniform spherical nanoparticles of gold, silver and palladium with controlled size that can be directly utilized for thin film preparation. A detailed study of the synthesis and application of gold nanoparticles to the electrochemical detection of hydrogen peroxide was carried out and reveals that the amplification of hydrogen peroxide sensing is size-dependent. In addition, these nanoparticles exhibit excellent compatibility towards composite preparation. As an example, a nanocomposite with Prussian Blue (PB) is synthesized and found to be useful for the fabrication of chemically modified electrodes (CME). The resulting CME shows dramatic improvement in the electrochemistry of PB with gradual enhancement in electrocatalytic efficiency towards hydrogen peroxide sensing. The nanocomposite is used to study the direct and horseradish peroxidase (HRP)-catalyzed reduction of hydrogen peroxide. The results recorded for hydrogen peroxide analysis show an improvement in sensitivity and limit of detection on decreasing the size of gold nanoparticles in all cases.

Tetrahydrofuran hydroperoxide and 3-Aminopropyltrimethoxysilane mediated controlled synthesis of Pd, Pd-Au, Au-Pd nanoparticles: Role of Palladium nanoparticles on the redox electrochemistry of ferrocene monocarboxylic acid

“…The properties of as synthesized PdNPs and bimetallic nanoparticles (as shown in Fig. 1) are analogous to that reported earlier [24,26,35,36] justifying novelty of the present process for rapid and controlled synthesis of these nanoparticles under ambient conditions. The time taken during such nanoparticle formation lie between 5 min to 2 h validating the use of 3-APTMS and THF-HPO as most efficient reagents in the synthesis of noble metal nanoparticles and bimetallic nanoparticles.…”

“…At first instant, the interaction of PdCl 2 and GPTMS need to be reviewed as reported earlier [24]. GPTMS being completely immiscible in water undergo rapid interaction with aqueous solution of palladium chloride.…”

“…Such requirement directed our attention to understand the role of palladium nanoparticles (PdNPs) of known nanogeometry on the redox behavior of Fc-COOH in the presence and absence of 3-APTMS since redox electrochemistry of the same is influenced in the presence of metal nanoparticles [23]. Recently, we have demonstrated that 3-APTMS acts as an active reagent for the synthesis and stabilization of noble metal nanoparticles of palladium, gold and silver [24,25]. Further, the use of 3-APTMS, tetrahydrofuron hydroperoxide (THF-HPO) has been investigated and the findings justify precise conversion of Au 3+ into gold nanoparticles (AuNPs) [26].…”

3-Aminopropyltrimethoxysilane and 3-Glycidoxypropyltrimethoxysilane Mediated Synthesis of Graphene and its Nanocomposite: Potential Bioanalytical Appliactions

“…We have studied in details on the role of 3-APTMS and 3-GPTMS during the controlled synthesis of noble metal nanoparticles (AuNPs, AgNPs and PdNPs) [10,11]. It has been found that 3-APTMS capped noble metal salts are converted into their respective nanoparticles in the presence of 3-GPTMS.…”

“…In addition to that some of such functional alkoxysilanes like 3-aminopropyltrimethoxysilane (3-APTMS) and 3-glycidoxypropyltrimethoxysilane (3-GPTMS)) have recently been utilized as reagents and stabilizer during the synthesis of noble metal nanoparticles under ambient [10][11][12]. Further the active role of 3-APTMS has also been demonstrated during the synthesis of prussian blue nanoparticles (PBNPs) [13,14].…”