Journal de la nanomédecine et de la nanotechnologie

Abstrait

Electrical Impedance Spectroscopy Using Single Wall Carbon Nanotubes Carboxlic Acid Functionalized: Detection of Copper in Tabuk-Kingdom of Saudi Arabia Water

Saloua Helali, Nadra Bohli, Hala Mohamed Abo Mostafa, Houda ben zina, Omar A Al-Hartomy and Adnane Abdelghani

Copper (Cu) is an essential element in mammalian nutrition. Since both copper deficiency and copper excess produce adverse health effects, so it is important to develop simple, sensitive and accurate methods for their detection in environment and food. In this study, the absorption of the copper ion in single wall carbon nanotubes carboxylic acid functionalized (SWCNTCOOH) was studied in buffer saline (PBS) and in Tabuk, kingdom of Saudi Arabia water. The gold electrode is functionalized with the self-assembled monolayer technique. The modified surface is activated with EDC/NHS for SWCNT-COOH immobilization. Each grafted layer on the gold electrode was characterized with cyclic voltammetry, impedance spectroscopy and Fourrier Transform Infra-Red spectroscopy (FTIR). The high insulating properties of the acidic thiol monolayer has been proved by cyclic voltammetry and impedance spectroscopy. The increases in DC current and the decrease in impedance confirm the conducting properties of the SWCNT-COOH layer. The development of sensor for copper detection was observed with the impedance spectroscopy. During impedance measurements, the charge transfer resistance increased significantly after absorption the copper in both buffer. The response of the developed sensor was very sensitive in the range of 10-300 ng/ml. The result show that the signal in Tabuk water is four time large relative to the signal in PBS.