Lead sensors development and antimicrobial activities based on graphene oxide/carbon nanotube/poly(O-toluidine) nanocomposite.

Authors:
Dr. Mohammed M Rahman, PhD
Dr. Mohammed M Rahman, PhD
CEAMR/King Abdulaziz University
Professor
Material chemist
Jeddah, Makkah | Saudi Arabia
Dr. Mohammad Oves, Phd
Dr. Mohammad Oves, Phd
King Abdul Aziz University
Assistent Prof.
Microbiology
Jeddah, Makkah | Saudi Arabia

Int J Biol Macromol 2016 Aug 22;89:198-205. Epub 2016 Apr 22.

Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia.

Graphene oxide/carbon nanotube/poly (O-toluidine) (GO-CNT-POT) nanocomposite was prepared by a situ polymerization method and characterized by X-ray powder diffractometry (XRD) and scanning electron microscopy (SEM). The antibacterial activity of the obtained GO-CNT-POT nanocomposite was also evaluated against Gram positive bacteria Bacillus subtilis, Gram negative bacteria Escherichia coli and antibiotics (Amoxicillin) using the agar plate. The antibacterial study showed that the GO-CNT-POT was found to be most effective against both B. subtilis and E. coli respectively which was significant compared to the amoxicillin and the simultaneously GO-CNT-POT nanocomposite were fabricated onto glassy carbon electrode (GCE) using conducting coating binders by I-V technique, where the total analytical parameters were measured for the development of sensitive lead sensors (Pb(2+)). The GO-CNT-POT nanocomposite were deposited on flat-GCE (surface area: ∼0.0316cm(2)) to result in a sensor that has a fast response to selective Pb(2+) ions in buffer system. Features including sensitivity, detection limit, reproducibility, linear dynamic range, selectivity, and electrochemical performances were investigated in details with the GO-CNT-POT nanocomposite fabricated GCE electrodes. The calibration plot is linear (r(2): 0.9907) over the large concentration range (0.1nM to 1.0mM). The sensitivity and detection limit is calculated as 8.53164μAcm(-2)μM(-1) and 89.0 pM (at a signal-to-noise-ratio, SNR of 3) respectively.

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http://dx.doi.org/10.1016/j.ijbiomac.2016.04.064DOI Listing
August 2016
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