{"title":"A reconfigurable monolith chip-type microwave gas sensor for ultrasensitive NH3 detection","authors":"","doi":"10.1016/j.matt.2024.04.040","DOIUrl":null,"url":null,"abstract":"<div><p><span><span>Microwave gas sensors (MGSs) have attracted the interest of researchers because of their low power consumption, non-contact operation, and room temperature detection capabilities. However, the practical use of sensitive circuits is currently inadequate. In this context, we propose a reconfigurable rectangular </span>waveguide microwave gas sensor (RWMGS). This RWMGS is achieved by designing a high Q-factor waveguide sensitive circuit and employing an In</span><sub>2</sub>O<sub>3</sub>/Al<sub>2</sub>O<sub>3</sub> monolith as the sensitive material. The prepared RWMGS exhibited an ultra-low detection limit of 10 ppb, high selectivity for NH<sub>3</sub>, and a remarkable sensitivity of 116.1 dB ppm<sup>−1</sup><span><span> for concentrations lower than 50 ppb. Importantly, we introduce a chip-type sensor mode that can be used for complex system detection. This simplifies the sensing system and provides significant advantages in MGS design. These advantages can be attributed to the unique hierarchical porous structure of the monolith and the high Q-factor waveguide </span>resonator.</span></p></div>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":17.3000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Matter","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2590238524002133","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Microwave gas sensors (MGSs) have attracted the interest of researchers because of their low power consumption, non-contact operation, and room temperature detection capabilities. However, the practical use of sensitive circuits is currently inadequate. In this context, we propose a reconfigurable rectangular waveguide microwave gas sensor (RWMGS). This RWMGS is achieved by designing a high Q-factor waveguide sensitive circuit and employing an In2O3/Al2O3 monolith as the sensitive material. The prepared RWMGS exhibited an ultra-low detection limit of 10 ppb, high selectivity for NH3, and a remarkable sensitivity of 116.1 dB ppm−1 for concentrations lower than 50 ppb. Importantly, we introduce a chip-type sensor mode that can be used for complex system detection. This simplifies the sensing system and provides significant advantages in MGS design. These advantages can be attributed to the unique hierarchical porous structure of the monolith and the high Q-factor waveguide resonator.
期刊介绍:
Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content.
Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.