3D Hydrogen Titanate Nanotubes on Ti Foil: A Carrier for Enzymatic Glucose Biosensor

• Published in: Sensors (Basel, Switzerland) Vol. 20; no. 4; p. 1024
• Main Authors: Ma, Lulu, Yue, Zhao, Huo, Guona, Zhang, Shasha, Zhu, Baolin, Zhang, Shoumin, Huang, Weiping
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI 14.02.2020; MDPI AG
• Subjects: 3d structure; Biosensing Techniques - methods; Electrochemistry; Glucose - analysis; glucose biosensor; glucose oxidase; Glucose Oxidase - metabolism; Hydrogen - chemistry; hydrogen titanate nanotubes; Imaging, Three-Dimensional; Nanotubes, Carbon - chemistry; Photoelectron Spectroscopy; Surface Properties; ti foil; Time Factors; Titanium - chemistry; X-Ray Diffraction; 3D structure; hydrogen titanate nanotubes; Ti foil; glucose biosensor; glucose oxidase
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s20041024

Glucose oxidase (GOx) based biosensors are commercialized and marketed for the high selectivity of GOx. Incorporation nanomaterials with GOx can increase the sensitivity performance. In this work, an enzyme glucose biosensor based on nanotubes was fabricated. By using Ti foil as a carrier, hydrogen titanate nanotubes (HTNTs), which present fine 3D structure with vast pores, were fabricated in-situ by the hydrothermal treatment. The multilayer nanotubes are open-ended with a diameter of 10 nm. Then glucose oxidase (GOx) was loaded on the nanotubes by cross-linking to form an electrode of the amperometric glucose biosensor (GOx/HTNTs/Ti electrode). The fabricated GOx/HTNTs/Ti electrode had a linear response to 1-10 mM glucose, and the response time was 1.5 s. The sensitivity of the biosensor was 1.541 A·mM ·cm , and the detection limit (S/N = 3) was 59 M. Obtained results indicate that the in-situ fabrication and unique 3D structure of GOx/HTNTs/Ti electrode are beneficial for its sensitivity.