Department of Electronics and Instrumentation, SRM Institute of Science and Technology, Kattankulathur 603203, Tamil Nadu, India.
Sensors (Basel). 2020 Oct 17;20(20):5889. doi: 10.3390/s20205889.
The exhaust gases from various sources cause air pollution, which is a leading contributor to the global disease burden. Hence, it has become vital to monitor and control the increasing pollutants coming out of the various sources into the environment. This paper has designed and developed a sensor material to determine the amount of carbon monoxide (CO), which is one of the major primary air pollutants produced by human activity. Nanoparticle-based sensors have several benefits in sensitivity and specificity over sensors made from traditional materials. In this study, tin oxide (SnO), which has greater sensitivity to the target gas, is selected as the sensing material which selectively senses only CO. Tin oxide nanoparticles have been synthesized from stannous chloride dihydrate chemical compound by chemical precipitation method. Palladium, at the concentration of 0.1%, 0.2%, and 0.3% by weight, was added to tin oxide and the results were compared. Synthesized samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) techniques. XRD revealed the tetragonal structure of the SnO nanoparticles and FESEM analysis showed the size of the nanoparticles to be about 7-20 nm. Further, the real-time sensor testing was performed and the results proved that the tin oxide sensor, doped with 0.2% palladium, senses the CO gas more efficiently with greater sensitivity.
来自各种来源的废气导致空气污染，这是全球疾病负担的主要原因之一。因此，监测和控制各种来源排放到环境中的不断增加的污染物变得至关重要。本文设计和开发了一种传感器材料，用于确定一氧化碳（CO）的含量，CO 是人类活动产生的主要空气污染物之一。基于纳米颗粒的传感器在灵敏度和特异性方面优于传统材料制成的传感器。在这项研究中，选择氧化锡（SnO）作为传感材料，因为它对目标气体具有更高的灵敏度，并且只选择性地感应 CO。通过化学沉淀法，从二水合氯化亚锡化合物合成了氧化锡纳米颗粒。将钯以 0.1%、0.2%和 0.3%的重量浓度添加到氧化锡中，并对结果进行了比较。通过 X 射线衍射（XRD）和场发射扫描电子显微镜（FESEM）技术对合成样品进行了表征。XRD 显示了 SnO 纳米颗粒的四方结构，FESEM 分析表明纳米颗粒的尺寸约为 7-20nm。此外，还进行了实时传感器测试，结果证明，掺杂了 0.2%钯的氧化锡传感器能更有效地感应 CO 气体，具有更高的灵敏度。
