Citation:

Lawrence, N., R. Deo, AND J. Wang. ELECTROCHEMICAL DETERMINATION OF HYDROGEN SULFIDE AT CARBON NANOTUBE MODIFIED ELECTRODES. (R830900). ANALYTICA CHIMICA ACTA 517(1-2):131, (2004).

Description:

Carbon nanotube (CNT) modified glassy carbon electrodes exhibiting a strong and stable electrocatalytic response towards sulfide are described. A substantial (400 mV) decrease in the overvoltage of the sulfide oxidation reaction (compared to ordinary carbon electrodes) is observed using the CNT-modified electrode, with oxidation starting at ca. −0.3 V (versus Ag/AgCl; pH 7.4). The CNT-coated electrodes thus allow highly sensitive, low potential (+0.1 V), stable amperometric sensing. A wide linear dynamic range (1.25–112.5 M) was achieved with a detection limit of 0.3 M (9 ppb). The enhance sensitivity is coupled to an improved stability. Such ability of carbon nanotubes to promote the sulfide electron-transfer reaction suggests great promise for miniaturized sensors for hydrogen sulfide.

Author Keywords: Sulfide; Chemical vapor deposition; ARC; Carbon nanotubes; Electrocatalytic; Glassy carbon

Record Details:

Record Type:DOCUMENT( JOURNAL/ PEER REVIEWED JOURNAL)

Product Published Date:01/01/2004

Record Last Revised:12/22/2005

Record ID: 85115

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Document IDs:

EPA Number :R830900