Aligned single-walled carbon nanotubes array electrode:Fabrication,characterization and application

In the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodimide hydrochloride (El)C) and N-hydroxysuccinimide (NHS),earboxylie group-funcfionalized single-walled carbon nanombes (SWNTs) were assembled vertically on the glassy carbon electrode using ethylenediamine as linking agent to fabricate an aligned electrode (SWNTE). The morphological characteristic was studied with atomic force microscope (AFM) and its electrochemical property was investigated using K3Fe(CN)6] as probe.ssDNA had a sensitive voltammetric response at the SWNTE and the oxidative peak potentials of guanine base and adenine base were 0.608 V and 0.896 V, respectively. Under the optimal conditions, the DPV peak current of guanine base vs. The concentration of ssDNA was linear in the range of 5.4 μg/L-10.8 mg/L with a detection limit of 1 μg/L (S/N = 3).