Research on the coil-shaped element made of α-Fe2O3 doped MWCNTs for the simultaneous measurement of gas and gap at room temperature

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-02-05 DOI:10.1016/j.snb.2025.137373

Luheng Wang, Maoyuan Nan, Xisi Long

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引用次数: 0

Abstract

The coil-shaped element based on α-Fe₂O₃ doped multi-walled carbon nanotubes (MWCNTs) is fabricated by sputtering and spraying technology for simultaneously measuring the gap and ethanol vapor at room temperature. The experimental results show that with the increase of spraying time, the gas response properties of MWCNTs-based coil-shaped elements change from p-type to n-type, while the gas response properties of the coil-shaped elements based on α-Fe₂O₃ doped MWCNTs change from n-type to p-type with the increase of mass ratio of α-Fe₂O₃ to MWCNTs. Particularly, the coil-shaped element with a mass ratio of 100 exhibits the highest gas response value and gap sensitivity in the gap range of 0~0.5 mm, the gas response value of impedance amplitude, impedance angle, and resistance is 0.659%, 0.265%, and 6.768% at the ethanol vapor concentration of 5000 ppm, respectively. The absolute/relative gap sensitivity of impedance amplitude and impedance angle is 54101.8 Ω·mm^-1/4.589%·mm^-1 and 2.069°·mm^-1/ 5.287%·mm^-1 in the gap range of 0~0.1 mm, respectively. Finally, a signal processing method is proposed for the simultaneous measurement of ethanol vapor concentration and gap. These results lay a foundation for the development of MWCNTs-based sensors and the sensors applied between narrow gaps.

查看原文本刊更多论文

用于在室温下同时测量气体和间隙的掺杂了 α-Fe2O3 的 MWCNT 的线圈状元件的研究

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.