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Study On Electrochemical Sensors Based On Carbon-supported PdNi Nanoparticles And Carbon-supported CoPd Nanoparticles

Posted on:2015-02-13Degree:MasterType:Thesis
Country:ChinaCandidate:T ZhaoFull Text:PDF
GTID:2268330428971520Subject:Analytical Chemistry
Abstract/Summary:PDF Full Text Request
The performances of sensor can be improved observably while the synergistic effect among bimetallic nanoparticles and composite effect between carbon material and nanoparticles were used, and thus a new direction was opened up to fabricate the electrochemical sensors with high-performances. In this thesis, carbon-supported PdNi nanoparticles and carbon-supported CoPd nanoparticles (NiPd/C and CoPd/C) were prepared, and two kinds of electrochemical sensors were fabricated, and then new methods for determination of ascorbic acid and glucose were built. The study contents of the electrochemical sensing were enrichedand, and the applications of nanomaterials were extended. The thesis concludes three chapters and the main contents are as follows:1. The advance of electrochemical sensing studies based on carbon-supported nanoparticles is reviewed, and the purpose and significance of this research were introduced.2. Carbon-supported PdNi nanoparticles (PdNi/C) were synthesized by using chemical reduction method and a novel electrochemical sensor was fabricated based on the materials, and then a new method to detect ascorbic acid and glucose was built. Experimental results showed that the sensor had the linear ranges of0.1μM-1.8mM (r=0.9973) and10μM-10mM, the detection limits of0.5mM and0.1μM (S/N=3) and the sensitivities of760.6μA mM-1cn-2and122.1μA mM-1cm-2when it was used for the detection of ascorbic acid and glucose at-50mV respectively. The studies showed that the electro-catalytic activity of NiPd/C was higher than the commercialized Pd/C. This method had the advantages of low overpotential and high sensitivity.3. The carbon-supported CoPd nanoparticles (CoPd/C) were synthesized, and a kind of ascorbic acid electrochemical sensor was fabricated based on this material, then a new method to detect ascorbic acid was built. Experimental results showed that the sensor had the linear ranges of0.2-7.62mM (r=0.9992), the detection limits of5μM (S/N=3) and the sensitivities of1509.02μA mM-1cm-2at-25mV. The potential of-25mV was lower than the potentials in other references (25-500mV). The studies shown that the electro-catalytic activity of carbon-supported CoPd nanoparticles (CoPd/C) for ascorbic acid was improved observably. This method had the advantages of low overpotential, good anti-interference and high sensitivity.
Keywords/Search Tags:Electrochemical sensor, Bimetallic nanoparticles, Ascorbic acid, Glucose
PDF Full Text Request
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