Determination of trace thiocyanate with nano-silver coated multi-walled carbon nanotubes modified glassy carbon electrode

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Novel nano-silver coated multi-walled carbon nanotube composites were prepared and used to fabricate a modified electrode. The application of the nano-silver coated multi-walled carbon nanotube composites modified electrode for determination of trace thiocyanate is demonstrated for the first time. The influence of substrate, pH and interference of coexisting substances was investigated for response properties of the electrode. There was a linear relationship at the range 2.5×10^-^9 to 5×10^-^8molL^-^1 and 5×10^-^8 to 1×10^-^6molL^-^1 of thiocyanate with the decrement of anodic DPV peak currents. The limit of detection was 1×10^-^9molL^-^1(S/N=3). The constructed electrode showed excellent reproducibility and stability. Actual urine and saliva samples of smoker and non-smoker were analyzed and satisfactory results were obtained. This method provides a new way to construct any electrode for biological and environmental analysis.

BUY FROM AMAZON–>> Determination of trace thiocyanate with nano-silver coated multi-walled carbon nanotubes modified glassy carbon electrode

Tris electrogenerated chemiluminescence sensor based on carbon nantube dispersed in sol-gel-derived titania-Nafion composite …

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
A highly sensitive and stable tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)”3^2^+) electrogenerated chemiluminescence (ECL) sensor was developed based on carbon nanotube (CNT) dispersed in mesoporous composite films of sol-gel titania and perfluorosulfonated ionomer (Nafion). Single-wall (SWCNT) and multi-wall carbon nanotubes (MWCNT) can be easily dispersed in the titania-Nafion composite solution. The hydrophobic CNT in the titania-Nafion composite films coated on a glassy carbon electrode certainly increased the amount of Ru(bpy)”3^2^+ immobilized in the ECL sensor by adsorption of Ru(bpy)”3^2^+ onto CNT surface, the electrocatalytic activity towards the oxidation of hydrophobic analytes, and the electronic conductivity of the composite films. Therefore, the present ECL sensor based on the CNT-titania-Nafion showed improved ECL sensitivity for tripropylamine (TPA) compared to the ECL sensors based on both titania-Nafion composite films without CNT and pure Nafion films. The present Ru(bpy)”3^2^+ ECL sensor based on the MWCNT-titania–Nafion composite gave a linear response (R^2=0.999) for TPA concentration from 50nM to 1.0mM with a remarkable detection limit (S/N=3) of 10nM while the ECL sensors based on titania-Nafion composite without MWCNT, pure Nafion films, and MWCNT-Nafion composite gave a detection limit of 0.1@mM, 1@mM, and 50nM, respectively. The present ECL sensor showed outstanding long-term stability (no signal loss for 4 months).

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Studies on electrochemical behaviors of acyclovir and its voltammetric determination with nano-structured film electrode

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
A multi-wall carbon nanotubes (MWNTs)-dihexadecyl hydrogen phosphate (DHP) film-coated glassy carbon electrode (GCE) was fabricated, and the electrochemical behaviors of acyclovir on the MWNTs-DHP film-coated GCE were investigated by using cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and chronocoulometry (CC). The oxidation peak current of acyclovir increased significantly and the peak potential shifted negatively at the MWNTs-DHP film-modified GCE, compared with that at a bare GCE. The results showed that this nano-structured film electrode exhibited excellent enhancement effects on the electrochemical oxidation of acyclovir. Consequently, a simple and sensitive electroanalytical method was developed for the determination of acyclovir. The oxidation peak current was proportional to the concentration of acyclovir from 8.0×10^-^8 to 1.0×10^-^5mol/L. The detection limit was about 3.0×10^-^8mol/L for 60s accumulation at 0.00V. The proposed method was demonstrated by using acyclovir tablets and the result was satisfying.

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Voltammetric determination of Cd^2^+ based on the bifunctionality of single-walled carbon nanotubes-Nafion film

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
In the presence of Nafion, single-walled carbon nanotubes (SWNTs) were easily dispersed into ethanol, resulting in a homogeneous SWNTs/Nafion suspension. After evaporating ethanol, a SWNTs/Nafion film with bifunctionality was constructed onto glassy carbon electrode (GCE) surface. Attributing to the strong cation-exchange ability of Nafion and excellent properties of SWNTs, the SWNTs/Nafion film-coated GCE remarkably enhances the sensitivity of determination of Cd^2^+. Based on this, an electrochemical method was developed for the determination of trace levels of Cd^2^+ by anodic stripping voltammetry (ASV). In pH 5.0 NaAc-HAc buffer, Cd^2^+ was firstly exchanged and adsorbed onto SWNTs/Nafion film surface, and then reduce at -1.10V. During the positive potential sweep, reduced cadmium was oxidized, and a well-defined stripping peak appeared at -0.84V, which can be used as analytical signal for Cd^2^+. The linear range is found to be from 4.0×10^-^8 to 4.0×10^-^6molL^-^1, and the lowest detectable concentration is estimated to be 4.0×10^-^9molL^-^1. Finally, this method was successfully employed to detect Cd^2^+ in water samples.

BUY FROM AMAZON–>> Voltammetric determination of Cd^2^+ based on the bifunctionality of single-walled carbon nanotubes-Nafion film

Electrocatalytic oxidation of NADH at an ordered carbon nanotubes modified glassy carbon electrode

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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Ordered carbon nanotubes (OCNTs), which was synthesized within the highly ordered pores of an alumina template membrane, were used to modify a glassy carbon (OCNT/GC) electrode. The OCNT/GC electrode showed potent electrocatalytic activity toward the electrochemical oxidation of NADH in phosphate buffer solution (pH 6.8) with a diminution of the overpotential of 645mV. The anodic peak currents increase linearly with the concentration of NADH in the range of 2×10^-^5 to 1×10^-^3M with a detection limit of 5×10^-^7M (at a S/N=3).

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