Synthesis of Hyper-branchedPoly(amidoamine)/Hybrid Silica Particle,Their Application for Chemosensor

Abstract

In this paper we show how to synthesize multi-functional silica nano particles and modify thiol terminated hyper-branched silica nanoparticles, poly(amidoamine) with thiol, but also detect with cadmium for the chemosensor. Multifunctional silica nano particles were prepared by an acid-base catalyst method, pH controlled with vinyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane and (3-aminopropyl) trimethoxysilane in an aqueous solution. The step-growth of hyper-branched ploy(amidoamine) silica particles was synthesized by Michael addition with methyl acrylate(MA) and the amidation of ethylenediamine(EDA). Finally, hyper-branched silica nanoparticles, poly(amidoamine), was exchanged amine for thiol from methy mercaptoacetate(MMA). 1st, 3rd, and 5th generations were exhibited synthesis reaction by IR spectrum. TMPyP is a group of organic compounds, including the porphine nucleus structure, that acts as quadridentate ligands to form chelate bonds with a cadmium ion. As a result, the oxidation of multi-functional silica nano particles and thiol-terminated hyper-branched silica particles were tagged TMPyP (meso-tetrakis(N-methylpyridinium-4-yl)porphyrin) in H2 O. In addition, we considered that thiol-terminated hyper-branched silica nano particles have more chemosensing effect because of structural features. Depend on concentration of TMPyP and generations of hyper-branched polymers, we acknowledged changed intensity with detection of a cadmium ion by a solid UV spectrum.