Conductive Ag-Based Modification of Hydroxyapatite Microtubule Array and Its Application to Enzyme-Free Glucose Sensing

Yingying Jiang, Haiyan Liu, Xuan Qi, Jun Sun, Mei Li, Jun Wang*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

4 Citations (Scopus)

Abstract

Plenty of biomineralized hydroxyapatite (BioHAP) matrix microtubules (named dentin tubules) with regular arrangement are inside mammal tooth dentin. Herein, electrically conductive polyaniline (PANI) is applied to modify the microtubule array to assemble a PANI/BioHAP composite through an in-situ polymerization method. On this basis, a sensor (PANI/BioHAP/AgHg) is assembled with PANI/BioHAP and silver amalgam, and further applied to enzyme-free glucose sensing. The inner-wall of the tubules is treated in advance with p-methylbenzene sulfonic acid to alter its hydrophilism into hydrophobicity. The treatment contributes to improve the diffusibility of aniline monomer in the tubules and to form a PANI conductive network on the wall. Meanwhile, a large quantity of active sites on the surface of BioHAP matrix performs both adsorption and concentration to glucose molecules. The special array structure helps to shield undesired electrochemical signals, and also increases the current response of glucose electro-catalytic oxidation.

Original languageEnglish
Pages (from-to)2542-2547
Number of pages6
JournalChemistrySelect
Volume3
Issue number9
DOIs
Publication statusPublished - 7 Mar 2018

Keywords

  • conductive modification
  • enzyme-free glucose sensing
  • hydroxyapatite
  • microtubule array
  • polyaniline

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