In Situ Vapor Polymerization of Poly(3,4-ethylenedioxythiophene) Coated SnO₂-Fe₂O₃ Continuous Electrospun Nanotubes for Rapid Detection of Iodide Ions.

Xiuru Xu,Rui Zhao,Bolun Sun,Wei Wang,Xue Zhang,Ce Wang

doi:10.3390/ma11112084

Abstract

In this work poly(3,4-ethylenedioxythiophene) (PEDOT) coated SnO2-Fe2O3 continuous nanotubes with a uniform core–shell structure have been demonstrated for rapid sensitive detection of iodide ions. The SnO2-Fe2O3 nanotubes were firstly fabricated via an electrospinning technique and following calcination process. An in situ polymerization approach was then performed to coat a uniform PEDOT shell on the surface of as-prepared SnO2-Fe2O3 nanotubes by vapor phase polymerization, using Fe2O3 on the surface of nanotubes as an oxidant in an acidic condition. The resultant PEDOT@SnO2-Fe2O3 core-shell nanotubes exhibit a fast response time (~4 s) toward iodide ion detection and a linear current response ranging from 10 to 100 μM, with a detection limit of 1.5 μM and sensitivity of 70 μA/mM/cm2. The facile fabrication process and high sensing performance of this study can promote a wide range of potential applications in human health monitoring and biosensing systems.

Highlights

Iodine is an important trace mineral and nutrient for humans, which is greatly needed for producing thyroid hormones in our body
PVP poly(vinyl pyrrolidone) (PVP)/SnCl2 /Fe(NO3 )3 precursor nanofibers were obtained by an electrospinning technique
Compared to the liquid phase in situ polymerization reported in previous work [19,20], in situ vapor phase polymerization [21,22] enables the fabrication of materials with improved ordering, stability, and controllability at the nanoscale

Summary

Introduction

Iodine is an important trace mineral and nutrient for humans, which is greatly needed for producing thyroid hormones in our body. Iodine deficiency is an important public health issue because it is a preventable cause of intellectual disability [1,2]. Rapid and sensitive detection of iodide ions is necessary for both diagnostic and pathological research. A large variety of methods have been developed to detect iodide ions, including inductively coupled plasma mass spectrometry method (ICP-MS) [3], atomic absorption spectrometry method (AAS) [4], field-effect transition sensor (FET) [5], flow injection analysis (FIA) [6], etc. Voltammetric methods have gained great attention owing to their rapid, accurate, and high responses.

Methods

Results

Conclusion