Electrochemical preparation of poly(3-methylthiophene-carbazole)/graphene oxide composite coating for the highly effective solid-phase microextraction of some fragrance

A poly(3-methylthiophene-carbazole)/graphene oxide composite coating was prepared on a stainless steel wire through electrochemical method. It showed high extraction efficiency, thermal stability and durability than those of corresponding single-component coatings due to the synergistic effect of different components. The resulting fiber was used for the headspace solid phase microextraction of octanal , nonanal , decanal , undecanol and dodecanol , followed by gas chromatography detection. The results showed that their GC peak areas were linear to their concentrations in the ranges of about 0.05–100   μg   L −1 , the detection limits were 22.6–40.5   ng   L −1 (S/N=3). The run-to-run RSD was smaller than 4.5% (n=4), and the fiber-to-fiber RSD was 4.0–9.3% (n=4). The method was successfully applied to the determination of the five analytes in candy, orange fruit and flower.