Abstract
Nonenzymatic glucose sensors employing multiwalled carbon nanotubes (MWNTs) with highly dispersed Pt-M (M = Ru and Sn) nanoparticles (Pt-M@PVP-MWNTs) were fabricated by radiolytic deposition. The Pt-M nanoparticles on the MWNTs were characterized by transmittance electron microscopy, elemental analysis, and X-ray diffraction. They were found to be well dispersed and to exhibit alloy properties on the MWNT support. Electrochemical testing showed that these nonenzymatic sensors had larger currents (mA) than that of a bare glassy carbon (GC) electrode and one modified with MWNTs. The sensitivity (A mM−1), linear range (mM), and detection limit (mM) (S/N = 3) of the glucose sensor with the Pt-Ru catalyst in NaOH electrolyte were determined as 18.0, 1.0–2.5, 0.7, respectively. The corresponding data of the sensor with Pt-Sn catalyst were 889.0, 1.00–3.00, and 0.3, respectively. In addition, these non-enzymatic sensors can effectively avoid interference arising from the oxidation of the common interfering species ascorbic acid and uric acid in NaOH electrolyte. The experimental results show that such sensors can be applied in the detection of glucose in commercial red wine samples.
Highlights
The measurement of glucose concentrations is important to diabetes diagnosis and to the food and textile industries, wastewater treatment, and environmental monitoring [1,2,3,4]
Pt-Ru nanoparticles were deposited on the surfaces of various carbon supports, including Vulcan XC-71, Ketjen-300, Ketjen-600, single-walled carbon nanotubes (SWNTs), and multiwalled carbon nanotubes (MWNTs) for use as fuel cell catalysts using γ-ray irradiation without anchoring agents [24]
The metallic nanoparticles were successfully grafted on to the surfaces of the MWNTs by free radicals induced during γ-irradiation [28, 31, 32]
Summary
The measurement of glucose concentrations is important to diabetes diagnosis and to the food and textile industries, wastewater treatment, and environmental monitoring [1,2,3,4]. Pt-Ru nanoparticles were deposited on the surfaces of various carbon supports, including Vulcan XC-71, Ketjen-300, Ketjen-600, single-walled carbon nanotubes (SWNTs), and MWNTs for use as fuel cell catalysts using γ-ray irradiation without anchoring agents [24]. Pt-M (M = Ru and Sn) catalysts on PVPMWNTs for detection of glucose were synthesized by a onestep radiation reaction Their structural and electrochemical properties were characterized by transmittance electron microscopy (TEM), X-ray diffraction (XRD), and elemental analysis. The prepared nonenzymatic sensors showed remarkably sensitive response currents towards glucose in a NaOH electrolyte It was highly stable, produced reproducible results, and was capable of resisting interference
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