Investigations on copper-titanate intercalation materials for amperometric sensor.
Copper-based titanate intercalation electrode materials (referred as Cu-TO) were achieved by electrochemical reduction of the intercalated cupric ions that were ion exchanged on the layer structured titanate films by using n-propylamine as an exfoliating agent. The copper-based titanate intercalation electrode materials were characterized by X-ray diffraction (XRD), electrochemical techniques and inductive coupled plasma-atomic emission spectroscopy (ICP-AES). These copper-based titanate materials were exploited to fabricate the enzymeless glucose sensors, and their assay performances to glucose were evaluated by conventional electrochemical techniques. Cyclic voltammetry (CV) and chronoamperometry (I-t) revealed a high sensitivity, fast response, excellent stability, and good reproducibility in the glucose determination at +0.55 V. Under optimal conditions, the electrocatalytic response of the sensor was proportional to the glucose concentration in the range of 2.5x10(-7) M to 8.0x10(-3) M with a detection limit of 5.0x10(-8) M (signal-to-noise=3). Moreover, the intercalated copper electrode materials exhibited high stability and improved selectivity for glucose compared with the more apparently accessible copper. This work also provides a simply controlled test-bed for electrochemical functionalization of layered titanate for sensor applications.
Tong
Shengfu
S
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, PR China.
Jin
Haiyan
H
Zheng
Dafang
D
Wang
Wen
W
Li
Xin
X
Xu
Yaohua
Y
Song
Wenbo
W
D015374:Biosensing Techniques / Q000295:instrumentation*; D002384:Catalysis; D017076:Computer-Aided Design; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry / Q000295:instrumentation*; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005947:Glucose / Q000032:analysis*; D007364:Intercalating Agents / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014025:Titanium / Q000737:chemistry*
D007364:Intercalating Agents; C009495:titanium dioxide; D003300:Copper; D014025:Titanium; D005947:Glucose