Electrochemical detection of celecoxib at a polyaniline grafted multiwall carbon nanotubes modified electrode.
A modified electrode is fabricated by grafting polyaniline (PANI) chains onto multiwall carbon nanotubes (MWNTs) and utilized for the adsorptive reduction of celecoxib (CEL). PANI-g-MWNTs modified electrode appreciably enhances the sensitive detection of CEL in extremely lower concentrations (1x10(-11)M). Square wave stripping voltammogram (SWSV) shows a reduction peak at -1.08V with a high peak current for SW frequency of 100Hz, amplitude of 25mV and step height of 6mV. The high surface area of PANI-g-MWNTs is effectively utilized for the adsorption of CEL to preconcentrate at the electrode. The PANI chains covalently linked to MWNTs mediate the electron transfer processes. The present finding open-up the scope for extending on the use of other conducting polymers grafted MWNTs modified electrodes for the detection of compounds that do not have surface-active properties at conventional electrodes.
Manesh
Kalayil Manian
KM
Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea.
Santhosh
Padmanabhan
P
Komathi
Shanmugasundaram
S
Kim
Nam Hee
NH
Park
Jong Wook
JW
Gopalan
Anantha Iyengar
AI
Lee
Kwang-Pill
KP