Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 13, Pages 21292-21303Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.05.220
Keywords
Halloysite nanotubes; 3-D MnO2 nanoflakes; M-HNTs-MnO2; Acetone sensing
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Funding
- Research Assistance Program (2020) in the Incheon National University
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2019R1G1A1009363]
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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 (R-air/R-gas = 35.6) to 100 ppm of acetone gas at operating temperature (150 degrees 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.
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