ATOMIC FORCE MICROSCOPIC AND ELECTROCHEMICAL CHARACTERIZATION OF THE MODIFIED SCREEN PRINTED CARBON ELECTRODE BY SELF ASSEMBLED DEPOSITION OF CHITOSAN AND ACTIVATED CARBON
Keywords:
Atomic force microscopy, cyclic voltammetry, Modified SPCE, Chitosan, Activated carbonAbstract
The surface topographic characteristics generated after a modification of screen printed carbon
electrode (SPCE) with either chitosan or activated carbon blending chitosan were closely investigated by atomic
force microscopy and a complementary electrochemical techniques. Eighty five percent deacetylation degree
chitosan was used at 1% in 1% acetic acid while the activated carbon blending ratio used was 1:1 in chitosan
solution. The modification was performed via self assembled deposition directly onto the working electrode
surface area. Growth feature of each modified surface was obviously differentiated by all roughness parameters
such as an average roughness, root mean square, height different, grain and fractal. The highest roughness value
with the least grain was from chitosan modified SPCE. A good correlation result was obtained with
electrochemical cyclic voltammetry that a great change in current response was also appeared. Both the modified
SPCE by chitosan and activated carbon blending chitosan could produce comparable higher current sensitivity
with up to around 0.5 slope value following by their regression coefficient of 0.99. Thus affordable and efficient
platforms for a fabrication of desirable pesticide biosensor could be achieved with these modifications as
expected.