Direct DNA Hybridization on the Single-Walled Carbon Nanotubes Modified Sensors Detected by Voltammetry and Electrochemical Impedance Spectroscopy

2009 ◽  
Vol 21 (19) ◽  
pp. 2116-2124 ◽  
Author(s):  
Ayfer Caliskan ◽  
Arzum Erdem ◽  
Hakan Karadeniz
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Dna Hybridization ◽  
Electrochemical Impedance ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The DNA hybridization assay using single-walled carbon nanotubes as ultrasensitive, long-term optical labels

2006 ◽  
Vol 17 (14) ◽  
pp. 3442-3445 ◽  
Author(s):  
Eung-Soo Hwang ◽  
Chengfan Cao ◽  
Sanghyun Hong ◽  
Hye-Jin Jung ◽  
Chang-Yong Cha ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Dna Hybridization ◽  
Single Walled Carbon Nanotubes ◽  
Hybridization Assay ◽  
Single Walled Carbon ◽  
Optical Labels ◽  
Walled Carbon Nanotubes

scholarly journals Multi-walled carbon nanotubes/nano-Ag-TiO2 membrane DNA electrochemical biosensor

2019 ◽  
Author(s):  
Zhongguo Zheng ◽  
Lisa Schultz ◽  
John Smith
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Biosensor ◽  
Electrochemical Impedance ◽  
Carbon Paste ◽  
Dna Electrochemical Biosensor ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Paste Electrode

AbstractA highly sensitive DNA electrochemical biosensor was prepared based on multi-walled carbon nanotube/nano-Ag-TiO2 composite membrane. The Ag-TiO2 composite is mixed with a suitable amount of multi-walled carbon nanotubes (MWNT) dispersed in N,N-dimethylformamide to form a uniform and stable mixed solution, which is applied onto the surface of the bare carbon paste electrode. A MWNT/Ag-TiO2 modified carbon paste electrode was prepared. The large specific surface area and good electron transport properties of carbon nanotubes have a good synergistic effect on the good biocompatibility of Ag-TiO2 nanocomposites and excellent adsorption capacity of DNA, which significantly improves the immobilization and DNA hybridization of DNA probes. Detection sensitivity. The preparation of the sensing membrane and the immobilization and hybridization of DNA were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The exogenous glufosinate acetyltransferase gene fragment of transgenic plants was detected by electrochemical impedance spectroscopy. The linear range was 1. 0 × 10 - 11 ∼1. 0 × 10 - 6 mol / L. The detection limit was 3. 12 × 10 - 12 mol / L.

Nanostructured cobalt phthalocyanine single-walled carbon nanotube platform: electron transport and electrocatalytic activity on epinephrine

2008 ◽  
Vol 12 (12) ◽  
pp. 1289-1299 ◽  
Author(s):  
Bolade O. Agboola ◽  
Alfred Mocheko ◽  
Jeseelan Pillay ◽  
Kenneth I. Ozoemena
Keyword(s):  
Carbon Nanotubes ◽  
Electrocatalytic Activity ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Pyrolytic Graphite ◽  
Single Walled Carbon Nanotubes ◽  
Cobalt Phthalocyanine ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The fabrication, characterization and application of edge-plane pyrolytic graphite electrode modified with acid-functionalized single-walled carbon nanotubes, nanostructured cobalt phthalocyanine and a mixture of both, towards epinephrine detection and analysis are described. The morphological features of the films were evaluated using atomic force microscopy (AFM). Electrochemistry of these electrodes in [ Fe ( CN )6]3−/4− using cyclic voltammetry and electrochemical impedance spectroscopy showed higher peak current responses with accompanying low electron-transfer resistances in comparison to the bare electrode. The edge-plane pyrolytic graphite-single-walled carbon nanotubes-nanostructured cobalt phthalocyanine electrode exhibited good electrocatalytic activity towards epinephrine oxidation with enhanced peak currents. Analytical studies using edge-plane pyrolytic graphite-single-walled carbon nanotubes-nanostructured cobalt phthalocyanine electrode proved that the electrode is suitable for sensitivity determination of epinephrine in pH 5 conditions judging from the good sensitivity (8.71 ± 0.31 A.M−1), and limit of detection (0.04 µM) and quantification (1.31 µM) obtained. Determination of EP in the absence and presence of ascorbic acid in phosphate buffer pH 5 conditions was carried out and it was established that the presence of AA did not interfere in EP analysis. Rotating disk electrode experiments proved that the catalytic rate constant was 2.28 × 1016 mM−1.s−1.

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