| Enhancing PEC Glucose Sensing of TiO2 Nanotubes by Tuning the Length and Annealing Ambient |
| Paper ID : 1086-UFGNSM-FULL |
| Authors: |
|
Aliakbar Saadati1, mohamad mahdi tahmasebi2, Naimeh Naseri *3 1Azadi avenue 2Sharif University of Technology, Azadi Ave. Tehran, Iran 3Azadi Ave |
| Abstract: |
| Due to the emergence of diabetes mellitus as a worldwide public health challenge, glucose sensors have raised considerable interest over the past few decades. Self-Organized and well aligned TiO2 nanotube arrays (TNAs) has been synthesized by a simple low cost electrochemical method and applied as efficient photoelectrochemical glucose biosensor. XRD result revealed formation of TNAs all in anatase phase. Length of the tubes has been changed in the range of 0.6-3.9 μm, by varying anodization time from 0.5 to 4 hour to probe its effect on the biosensor performance. It has been found that although long tubes were more sensitive to low concentrations of glucose representing high photocurrent responses, nanotubes grown for 2 h was the optimum sample due to better mechanical stability and presenting more precise result. Moreover, annealing the optimum TNAs in Ar-H2 caused more photoactive sample with nearly similar sensitivity against glucose. Hence, from energy level point of view, the formed oxygen vacancies did not participate in glucose oxidation reaction. All photocurrent densities in the absent of analyte and photoresponses against various concentrations of glucose have been studied systematically introducing 2 hours and annealing in air as the optimum growth and annealing conditions, respectively, leading to 244.5 ± 48.0 μA/mM.cm2 as sensitivity factor and 0.14 ± 0.01 mM as saturation limit for glucose concentration. This result suggests the grown TNAs as a promising semiconductor host for future modifications. |
| Keywords: |
| TiO2 nanotube array, Photoelectrochemical biosensing, Sensitivity factor, Glucose detection |
| Status : Paper Accepted (Oral Presentation) |
