Screen printed electrodes (SPE) are highly attractive as transducers of chemical sensors for
the screening of a number of important analytes. The surface modification of these electrodes
is easily carried out in order to achieve higher sensitivity. Carbon nanostructures have been
extensively used for this purpose, as the number of active sites can be greatly increased. On
the other hand, the immobilization of adequate functional groups is usually carried out to
increase sensors selectivity through specific interactions between the immobilised chemical
moieties and the analyte of interest.
Among the techniques used to functionalize electrodes surface, non-covalent modification
offer advantages related to the simplicity of the process and the reproducibility of the sensor
operation. Recently a dopamine sensor based a perylene tetracarboxylic acid functionalized
graphene sheets was developed [1].
In this work, voltammetric response of SPEs modified with CNTs functionalized by noncovalent
bond using perylene modified using amino acids such as L-Tryptophan, L-Tyrosine
and L-Cysteine is presented. The effect of the concentration ratio of CNT and perylene
modified is studied analysing the response of model compounds, such as ascorbic acid and
hydroquinone. The performance of these sensors is characterized regarding their catalytic
activity
