Electrochemical Biosensor Based on Multi-Walled Carbon Nanotubes and Au Nanoparticles Synthesized in Chitosan

2007 ◽  
Vol 7 (4) ◽  
pp. 1618-1624 ◽  
Author(s):  
Xinhuang Kang ◽  
Zhibin Mai ◽  
Xiaoyong Zou ◽  
Peixiang Cai ◽  
Jinyuan Mo
Keyword(s):  
Carbon Nanotubes ◽  
Au Nanoparticles ◽  
Electrochemical Biosensor ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Biosensors for Food Toxin Detection: Carbon Nanotubes and Graphene

2015 ◽  
Vol 1725 ◽  
Author(s):  
Bansi D. Malhotra ◽  
Saurabh Srivastava ◽  
Shine Augustine
Keyword(s):  
Carbon Nanotubes ◽  
Early Detection ◽  
Electrochemical Properties ◽  
Carbon Materials ◽  
Electrochemical Biosensor ◽  
Food Contamination ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Based Nanomaterials ◽  
Food Toxin ◽  
Walled Carbon Nanotubes

ABSTRACTThere is increased interest towards the application of carbon based nanomaterials to biosensors since these can be used to quickly detect presence of the toxins in food, agricultural and environmental systems. The accurate, faster and early detection of food toxins is presently very important for ensuring safety and shelf life of agricultural commodities resulting from food contamination. The carbon materials (CNTs) and recently discovered graphene have been predicted to be promising candidates in the development of electrochemical biosensor owing to their exceptionally large surface area and interesting electrochemical properties. We focus on some of the recent results obtained in our laboratories pertaining to the development of biosensors based on multi-walled carbon nanotubes and graphene for mycotoxin(aflatoxin ) detection.

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.

Enhanced Sensitivity of Electrochemical Biosensor on Microfluidic Paper Based Analytical Device Using Zno/MWCNTS Nanocomposite

2019 ◽  
Vol 9 (02) ◽  
Author(s):  
Roekmono . ◽  
Harsono Hadi1 ◽  
Luthviyah Choirotul Muhimmah1 ◽  
Ruri Agung Wahyuono ◽  
Hilya Nur Imtihani ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Ascorbic Acid ◽  
Electrochemical Biosensor ◽  
Glucose Measurement ◽  
Present System ◽  
Current Response ◽  
Enhanced Sensitivity ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Analytical Device

This paper presents an integrated ZnO/multi-walled carbon nanotubes (MWCNTs) electrode in novel stacking paper-based microfluidic analytical device for electrochemical biosensor. The designed sensors were subjected to detect glucose and ascorbic acid in a simulated body fluid using electrochemical methods, including cyclic voltammetry and impedance spectroscopy. The composite of ZnO/multi-walled carbon nanotubes (MWCNTs) with variations in mass fractions of 0.1, 0.5, 1, 2, 4 and 8% MWCNTs for measuring ascorbic acid and glucose with concentrations spanning from 0.02 to 5.12mM. The best results are obtained by 2% of MWCNTs in composited electrode, in which linear characteristics (R2>0.8) of the current response value show a sensitivity (gradient) of 0.017 and 0.085 µA/mM.cm2 for ascorbic acid and glucose measurement, respectively. The electrochemical detection by means of impedance spectra shows a linearly decreasing trend of chemical capacitance with increasing concentration of glucose and ascorbic acid. However, in the present system it is not sufficient to specifically distinguish the frequency response associated to glucose and ascorbic acid.

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