Near Infrared Sensor to Determine Carbon Dioxide Gas Based on Ionic Liquid

In this study we present an NIR carbon dioxide gas sensor based on inner filter process that includes ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4), to improve its stability, dynamic behavior and lifetime, which are usually the main drawbacks with these sensors. The presence of CO2 causes a displacement simple boron-dipyrromethene-type fluorophore, azaBODIPY, as pH indicator towards acid form. This increases emission intensity Cr(III)-doped gadolinium aluminium borate (GAB) luminophore. characterization prepared was carried out discussion results is presented. response recovery times improved considerably, 23 49 s, respectively, respect without IL, at 60 120 respectively,. Additionally, measurement range extended when using able in case measure complete up 100% CO2; IL limited 60% CO2. detection limit ranges from 0.57% 0.26% added. useful lifetime sensing membrane 20 days for membranes only 6 always kept dark need maintain special atmosphere.