Fig. 1. Preparation of GOx-midified biosensor based on poly(3-thiophenecarboxylic acid, TCA), poly(thiophene, TCA), and poly(TCA-co-Th).
Fig. 2. Electrochemical polymerization of the TCA, Th and the mixture of TCA/Th in acetonitrile with 10mM[N(Bu)4]+[BF4]- at scan rate 0.075V/S(see, Table 1).
Fig. 3. Electrochemical polymerization mechanism of thiophene derivatives in acetonitrile with 10mM [NCH3CH2CH2CH2]+[BF4]- as electrolyte at scan rate 75mV/s.
Fig. 4. Contact angles of bare ITO, No. 1, 2, 3, 4 and 5 (see, Table 1).
Fig. 5. FT-IR spectra of No. 1, No. 2 and No. 4 (see, Table 1).
Fig. 6. Cross-section SEM images of poly(TCA-co-Th)/ITO electrode (see, Table 1).
Fig. 7. Cyclic voltammograms of 1mM K3Fe (CN) 6 and K4Fe (CN) 6 (1/1, mol-%) using poly(TCA), poly(Th), and poly(TCA-co-Th)-modified ITO electrode in 0.1M KCl.
Fig. 8. Cyclic voltammograms of glucose in 0.1 M PBS (pH 6.8) using GOx-modified biosensor (No. 4) at a scan rate of 100 mV/s.
Fig. 9. Chronoamperometry electrochemical response according to glucose concentration using GOx biosensor (No. 5) in 0.1 M PBS solution at a -0.175 V potential.
Table 1. Electrochemical polymerization condition of the TCA, Th, and the mixture of TCA/Th a)
Table 2. Interference effect of various compounds on the assay of glucose using GOx-modified biosensor (No. 4)
Table 3. Comparison of the reported glucose biosensors