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Theacid-treatedmulti-walledcarbonnanotubes(MWNTs),whichweremodifiedonthesurfaceofgoldelectrode,offerssubstantialimprovementsinvoltammetricsensitivityandselectivitytowardsthedeterminationofdopamine(DA).Itcaninhibitthevoltammetricresponseofascorbicacid(AA)whiletheredoxreactionofdopamineispromoted.Whenadifferentialpulsevoltammetric(DPV)techniquewasused,thepeakseparationbetweenDAsandAAswas244mV.Basedonthis,aselectivemethodcouldbeconstructedtodetectDAinthepresenceof1000timeshigherconcentrationofAA.Theeffectofvariousexperimentalparametersonthevoltammetricresponseofdopaminewasinvestigated.Underthechosenconditions,thepeakcurrentsarecorrespondentlinearlytotheconcentrationsofDAintherangeof5107~4104molL1withalimitofdetectionof2107molL1.TheproposedmethodcanbeappliedtodetectDAinrealsamples.
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