Nanoparticle Imprinted Matrices as Sensing Layers forSize-Selective Recognition of Silver Nanoparticles.

Citation:

Julia Witt, Mandler, Daniel , and Wittstock, Gunther. . 2016. “Nanoparticle Imprinted Matrices As Sensing Layers Forsize-Selective Recognition Of Silver Nanoparticles.”. Chemelectrochemchemelectrochem, Pp. Ahead of Print.

Abstract:

This study extends the concept of nanoparticle imprinted matrixes (NAIMs) to systems, in which template nanoparticles (NPs) are immobilized on a conducting surface and a polymer matrix is built around them before the release of the template NPs. Specifically, citrate-stabilized AuNPs, 40 nm in diam., were bound to a 3-aminopropyltriethoxysilane (APTES)-modified indium tin oxide (ITO) electrode at pH 5. Subsequently, a polymer matrix was generated by electropolymn. of self-inhibiting poly(phenol) (PPh) layer. The template AuNPs were removed either by electrooxidn. of the Au core during linear sweep voltammetry (LSV) in Cl–contg. aq. soln. or by chem. oxidn. in aq. KCN soln. After template removal, nanocavities were left behind, which showed size-selective in the competitive reuptake of analyte NPs demonstrated by the preference for citrate-stabilized silver nanoparticles (AgNPs) with 20 nm diam. over AuNPs with 50 nm diam. The remaining nanocavities and their size-recognition ability were examd. by SEM and LSV. Complementing studies by X ray photoelectron spectroscopy and scanning force microscopy corroborated the template embedding, template release and analyte NP uptake. [on SciFinder(R)]