Micrometric thermal electronic nose able to detect and quantify individual gases in a mixture

IF 6.7 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Science: Advanced Materials and Devices Pub Date : 2024-06-27 DOI:10.1016/j.jsamd.2024.100760
Matteo Tonezzer , Michele Ricci , Nguyen X. Thai , Hugo Nguyen , Nguyen V. Duy , Nguyen D. Hoa
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Abstract

Recent urbanization and environmental problems urge for networks of sensors that can monitor air quality. Small, inexpensive, and smart sensors are one of the key components enabling the realization of such networks. Chemoresistive sensors are the ideal candidate, but they greatly lack selectivity, and for this reason, they are usually combined in arrays to create electronic noses, whose dimensions, however, make them not miniaturizable and cannot be integrated into portable devices. To overcome this inconvenience, we present a thermal electronic nose consisting of identical resistive sensors working at different temperatures so that the whole device is simple to make and tiny. The device contains two sensor arrays based on tin oxide nanowires decorated with Ag and Pt nanoparticles, respectively. The five sensors in each array are identical, but their response is differentiated by different temperatures locally generated by an on-chip integrated heater. This innovative approach allows the tiny array of five sensors together with the integrated heater to occupy only approximately 50 × 200 μm2 and consume only 120 μW. The tiny and portable device can estimate the concentration of H2 and NH3 in a mixture with a root mean square error of 6.1 ppm and 13.3 ppm, respectively, and it still works well after two months. The performance analysis of the double partial least squares regression used for concentration estimation also allows for feedback on which sensors are the most sensitive to which gas so that the electronic nose can be engineered for specific applications using the most suitable sensors. The size of the thermal electronic nose allows it to be integrated into portable and wearable devices, and its performance makes it suitable for any gas detection application. For example, a smartphone with an integrated sensor could carry out breath analysis and act as medical pre-screening or be used to evaluate the freshness of agri-food products in a rapid and non-invasive way.

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能够检测和量化混合物中单个气体的微量热电子鼻
近来的城市化和环境问题要求建立能够监测空气质量的传感器网络。小型、廉价和智能传感器是实现此类网络的关键元件之一。化学电阻传感器是理想的选择,但它们严重缺乏选择性,因此,通常将它们组合成阵列,形成电子鼻,但其尺寸使它们无法小型化,也无法集成到便携式设备中。为了克服这种不便,我们提出了一种热敏电子鼻,它由在不同温度下工作的相同电阻传感器组成,因此整个装置的制作简单且体积小。该装置包含两个传感器阵列,分别以银和铂纳米粒子装饰的氧化锡纳米线为基础。每个阵列中的五个传感器完全相同,但它们的反应却因片上集成加热器产生的局部温度不同而有所区别。这种创新方法使得由五个传感器组成的微小阵列和集成加热器仅占大约 50 × 200 μm2 的面积,耗电量仅为 120 μW。这种微型便携式装置可以估算出混合物中 H2 和 NH3 的浓度,均方根误差分别为 6.1 ppm 和 13.3 ppm,而且两个月后仍能正常工作。对用于浓度估计的双偏最小二乘法回归进行性能分析后,还可以反馈哪些传感器对哪些气体最敏感,这样就可以使用最合适的传感器为特定应用设计电子鼻。热敏电子鼻的尺寸使其可以集成到便携式和可穿戴设备中,其性能使其适用于任何气体检测应用。例如,集成了传感器的智能手机可以进行呼气分析,作为医疗预检设备,或用于快速、无创地评估农业食品的新鲜度。
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来源期刊
Journal of Science: Advanced Materials and Devices
Journal of Science: Advanced Materials and Devices Materials Science-Electronic, Optical and Magnetic Materials
CiteScore
11.90
自引率
2.50%
发文量
88
审稿时长
47 days
期刊介绍: In 1985, the Journal of Science was founded as a platform for publishing national and international research papers across various disciplines, including natural sciences, technology, social sciences, and humanities. Over the years, the journal has experienced remarkable growth in terms of quality, size, and scope. Today, it encompasses a diverse range of publications dedicated to academic research. Considering the rapid expansion of materials science, we are pleased to introduce the Journal of Science: Advanced Materials and Devices. This new addition to our journal series offers researchers an exciting opportunity to publish their work on all aspects of materials science and technology within the esteemed Journal of Science. With this development, we aim to revolutionize the way research in materials science is expressed and organized, further strengthening our commitment to promoting outstanding research across various scientific and technological fields.
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