Abstract
Vinyl polymer-grafted multiwalled carbon nanotube (MWNT) supports with anion groups were prepared for use as biosensor supports by radiation-induced graft polymerization (RIGP) of the vinyl monomers acryloyl diphosphoric acid (ADPA), acrylic acid (AA), sodium styrenesulfonate (NaSS), and methacrylic acid (MA) onto the surface of MWNTs. The electrogenerated chemiluminescence sensors based on a glass carbon electrode (ECL-GCE) and a screen printed electrode (ECL-SPE) were fabricated by immobilization of Ru(bpy)3 2+complex after coating of vinyl polymer-grafted MWNT inks on the surface of the GCE and SPE without any polymer binders in order to obtain high electrogenerated chemiluminescence intensity. For detection of alcohol concentration, alcohol dehydrogenase (ADH) was immobilized onto an ECL-GCE sensor prepared by poly(NaSS)-g-MWNT supports. The prepared biosensor based on ADH is suitable for the detection of ethanol concentration in commercial drinks.
Highlights
Radiation-induced graft polymerization can convert functional polymers on polymer substrates with specific thermal, mechanical, electronic, or crystalline properties
electrogenerated chemiluminescene (ECL) sensors have been prepared through the immobilization of Ru(bpy)32+ on conducting polymer-wrapped MWNTNafion composite film, COOH-functionalized multiwalled carbon nanotube (MWNT), and Au nanoparticles; despite performing well, these sensors relied on coating the MWNTs, SiO2 nanaospheres, and Au nanoparticles with polymer binder to immobilize the Ru complex onto the GC electrode surfaces, which can decrease ECL intensity and reproducibility
ECL sensors based on glass carbon electrodes (ECL-GCE) and screen printed electrodes (ECL-SPE) were fabricated by immobilization of the Ru(bpy)32+ complex after coating of vinyl polymer-grafted MWNT inks on the surface of the glass carbon electrodes (GCE) and screen printed electrodes (SPE)
Summary
Radiation-induced graft polymerization can convert functional polymers on polymer substrates with specific thermal, mechanical, electronic, or crystalline properties It has been used for the introduction of specific functional groups from various vinyl monomers to carbon materials in order to prepare supports with specific functionality for biosensors [1,2,3,4]. We selected vinyl monomers with anion groups in order to induce radiation-induced graft polymerization onto the surface of MWNTs during γ-ray irradiation in aqueous solution at room temperature. ECL sensors based on glass carbon electrodes (ECL-GCE) and screen printed electrodes (ECL-SPE) were fabricated by immobilization of the Ru(bpy)32+ complex after coating of vinyl polymer-grafted MWNT inks on the surface of the glass carbon electrodes (GCE) and screen printed electrodes (SPE). ECL biosensors for the determination of ethanol concentration were fabricated by immobilization of alcohol dehydrogenase (ADH) onto the prepared ECL-GCE based on poly(NaSS)-gMWNT supports
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