Graphene-based THz wave gas sensor for methanol detection

IF 4.9 Q1 CHEMISTRY, ANALYTICAL

Sensing and Bio-Sensing Research Pub Date : 2025-05-20 DOI:10.1016/j.sbsr.2025.100809

Saber Norouzi , Hosein Alavi-Rad , Seyed Saleh Ghoreishi Amiri , Reza Yousefi , Hadi Dehbovid

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引用次数: 0

Abstract

Context

This study aims to model and simulate a graphene-based Methanol (CH3OH) detector. The primary objective of this research is to obtain different absorption responses against different methanol concentrations in the surrounding environment. This paper proposes a gap between layers to intensify the direct interaction between methanol molecules and the detector. Furthermore, the THz spectrum is considered due to its potential and graphene-reliable modeling in THz frequencies. We investigate the effects of parameter variations and consequent response deviations. The significance of this research lies in that the detector is sensitive to the surrounding environment's refractive index. This sensitivity can be leveraged to detect any target components in air or liquid.

Methods

This study was conducted involving an equivalent circuit model plus full-wave numerical simulation. Data were collected from MATLAB and CST, and they show acceptable convergence. The design methodology includes investigating impedance matching between the detector and the surrounding environment. The findings indicate that the proposed graphene-based detector appropriately reacts against methanol concentration. Our results demonstrate significant deviations in absorption response for methanol concentration above 50 ppm while the absorption response is highly robust against geometrical variations. It is shown that methanol vapor with concentrations from 50 ppm to 500 ppm covers absorption peaks all over the THz spectrum. Such a reliable methanol detector is highly in demand for healthcare applications due to its efficiency and capabilities.

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甲醇检测用石墨烯基太赫兹波气体传感器

本研究旨在对基于石墨烯的甲醇（CH3OH）探测器进行建模和模拟。本研究的主要目的是获得对周围环境中不同甲醇浓度的不同吸收响应。本文提出了层与层之间的间隙，以加强甲醇分子与检测器之间的直接相互作用。此外，太赫兹频谱由于其潜力和石墨烯可靠的太赫兹频率建模而被考虑。我们研究了参数变化和相应的响应偏差的影响。本研究的意义在于探测器对周围环境的折射率非常敏感。这种灵敏度可以用来检测空气或液体中的任何目标成分。方法采用等效电路模型加全波数值模拟的方法进行研究。通过MATLAB和CST采集数据，结果表明收敛性可以接受。设计方法包括研究探测器与周围环境之间的阻抗匹配。研究结果表明，所提出的石墨烯基检测器对甲醇浓度有适当的反应。我们的结果表明，在甲醇浓度高于50 ppm的吸收响应显著偏差，而吸收响应是高度稳健的几何变化。结果表明，浓度为50 ~ 500 ppm的甲醇蒸气覆盖了太赫兹光谱的所有吸收峰。由于其效率和能力，这种可靠的甲醇检测器在医疗保健应用中需求量很大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensing and Bio-Sensing Research Engineering-Electrical and Electronic Engineering

CiteScore

10.70

自引率

3.80%

发文量

审稿时长

87 days

期刊介绍： Sensing and Bio-Sensing Research is an open access journal dedicated to the research, design, development, and application of bio-sensing and sensing technologies. The editors will accept research papers, reviews, field trials, and validation studies that are of significant relevance. These submissions should describe new concepts, enhance understanding of the field, or offer insights into the practical application, manufacturing, and commercialization of bio-sensing and sensing technologies. The journal covers a wide range of topics, including sensing principles and mechanisms, new materials development for transducers and recognition components, fabrication technology, and various types of sensors such as optical, electrochemical, mass-sensitive, gas, biosensors, and more. It also includes environmental, process control, and biomedical applications, signal processing, chemometrics, optoelectronic, mechanical, thermal, and magnetic sensors, as well as interface electronics. Additionally, it covers sensor systems and applications, µTAS (Micro Total Analysis Systems), development of solid-state devices for transducing physical signals, and analytical devices incorporating biological materials.