Surface tuning of halloysite nanotubes with Fe3O4 and 3-D MnO2 nanoflakes for highly selective and sensitive acetone gas sensing

Bharat Sharma, Avinash A. Kadam, Jung Suk Sung, Jae ha Myung

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Nanosized M-HNTs-MnO2 (Magnetic halloysite nanotubes-manganese dioxide) nanocomposite was synthesized by the reduction-precipitation method followed by the hydrothermal process. The existence of MnO2 nanoflakes on M-HNTs represents 3-D nanostructures without stacking of nanotubes and agglomeration. The sensor-based on M-HNTs-MnO2 nanocomposites exhibits higher sensor response (Rair/Rgas = 35.6) to 100 ppm of acetone gas at operating temperature (150 °C), with a short response-recovery time (3 s/7 s). The M-HNTs-MnO2 nanocomposite sensor shows excellent potential to act as a low cost, low-temperature sensor for acetone gas, with high acetone selectivity under high humidity conditions and with the interference of other gases. The high surface to volume ratio, three-dimensional nanostructure, and strong interactions between M-HNTs and MnO2 nanoflakes are accountable for the improvement of acetone sensing performance. Based on the high acetone selectivity, high stability and fast dynamic response, the M-HNTs and MnO2 sensor is an extremely appropriate candidate for a low-cost acetone sensor, and the projected approach offers a way to develop gas sensors that can be function at low temperatures for a wide variety of applications.

Original languageEnglish
Pages (from-to)21292-21303
Number of pages12
JournalCeramics International
Volume46
Issue number13
DOIs
StatePublished - Sep 2020

Keywords

  • 3-D MnO nanoflakes
  • Acetone sensing
  • Halloysite nanotubes
  • M-HNTs-MnO

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