Author/Authors :
Reddy, Sathish Center for Nanochemistry - Beijing National Laboratory for Molecular Sciences - Key Laboratory for the Physics and Chemistry of Nanodevices - State Key Laboratory for Structural Chemistry of Unstable and Stable Species - College of Chemistry and Molecular Engineering - Peking University , Du, Ran Center for Nanochemistry - Beijing National Laboratory for Molecular Sciences - Key Laboratory for the Physics and Chemistry of Nanodevices - State Key Laboratory for Structural Chemistry of Unstable and Stable Species - College of Chemistry and Molecular Engineering - Peking University , Xu, Hua Center for Nanochemistry - Beijing National Laboratory for Molecular Sciences - Key Laboratory for the Physics and Chemistry of Nanodevices - State Key Laboratory for Structural Chemistry of Unstable and Stable Species - College of Chemistry and Molecular Engineering - Peking University , Wu, Juanxia Center for Nanochemistry - Beijing National Laboratory for Molecular Sciences - Key Laboratory for the Physics and Chemistry of Nanodevices - State Key Laboratory for Structural Chemistry of Unstable and Stable Species - College of Chemistry and Molecular Engineering - Peking University , Mao, Nannan Center for Nanochemistry - Beijing National Laboratory for Molecular Sciences - Key Laboratory for the Physics and Chemistry of Nanodevices - State Key Laboratory for Structural Chemistry of Unstable and Stable Species - College of Chemistry and Molecular Engineering - Peking University , Zhang, Jin Center for Nanochemistry - Beijing National Laboratory for Molecular Sciences - Key Laboratory for the Physics and Chemistry of Nanodevices - State Key Laboratory for Structural Chemistry of Unstable and Stable Species - College of Chemistry and Molecular Engineering - Peking University
Abstract :
An efficient multi-walled carbon nanotube/gold colloidal nanoparticle paste electrode (MWCNTs/ Au Nps PE) was prepared for detection of hydrazine in the presence of pyrogallol red as a mediator in the homogenous solution. The prepared MWCNTs/ Au Nps PE and multi-walled carbon nanotube paste electrode (MWCNTs PE) were characterized by Raman spectroscopy, scanning electron microscopy and cyclic voltammetry. The MWCNTs/ Au Nps PE exhibited a very large decrease in the over potential (0.3V to 0.0V) and significant enhanced peak current response for detection of hydrazine in the presence of pyrogallol red as a mediator in the Na2CO3 - KCl solution. The mass transfer of hydrazine on the surface of MWCNTs/Au Nps PE was controlled by adsorption process. The proposed method exhibits outstanding sensitivity (2.5 μA/μM) and low detection limit (0.4 μM) at 0.0V. All the results indicated a good potential application of this sensor in the detection of hydrazine. The use of MWCNTs/ Au Nps PE was demonstrated for detection of hydrazine in the drinking water samples.
Keywords :
Gold colloidal nanoparticles , Hydrazine , Multi walled carbon nanotube paste electrode , Cyclic voltammetry , Linear sweep voltammetry
