Flame-Made La2O3-Based Nanocomposite CO2 Sensors as Perspective Part of GHG Monitoring System

Sensors

卷:21

Marina Rumyantseva¹  Matvey Andreev¹  Darya Filatova¹  Valeriy Krivetskiy¹  Vadim Platonov¹  Elena Galitskaya²  Oleg Zhdaneev²  Vladimir Amelichev³  Anastasiya Nikolaeva³  Sergey Generalov³  Sergey Polomoshnov³ 

[1] Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia;

[2] Russian Energy Agency, Ministry of Energy of the Russian Federation, 129085 Moscow, Russia;

[3] Scientific-Manufacturing Complex Technological Centre, 124498 Moscow, Russia;

关键词: greenhouse gases;    CO₂;    gas sensor;    semiconductor;    lanthanum oxide;    nanocomposite;   

DOI  :  10.3390/s21217297

来源: DOAJ

【 摘 要 】

Continuous monitoring of greenhouse gases with high spatio-temporal resolution has lately become an urgent task because of tightening environmental restrictions. It may be addressed with an economically efficient solution, based on semiconductor metal oxide gas sensors. In the present work, CO₂ detection in the relevant concentration range and ambient conditions was successfully effectuated by fine-particulate La₂O₃-based materials. Flame spray pyrolysis technique was used for the synthesis of sensitive materials, which were studied with X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs) and low temperature nitrogen adsorption coupled with Brunauer–Emmett–Teller (BET) effective surface area calculation methodology. The obtained materials represent a composite of lanthanum oxide, hydroxide and carbonate phases. The positive correlation has been established between the carbonate content in the as prepared materials and their sensor response towards CO₂. Small dimensional planar MEMS micro-hotplates with low energy consumption were used for gas sensor fabrication through inkjet printing. The sensors showed highly selective CO₂ detection in the range of 200–6667 ppm in humid air compared with pollutant gases (H₂ 50 ppm, CH₄ 100 ppm, NO₂ 1 ppm, NO 1 ppm, NH₃ 20 ppm, H₂S 1 ppm, SO₂ 1 ppm), typical for the atmospheric air of urbanized and industrial area.

【 授权许可】

Unknown