| Title: | Imidazole-based ionogel as room temperature benzene and formaldehyde sensor |
| Author(s): | Gil-Gonzalez N; Benito-Lopez F; Castano E; Morant-Minana MC; |
| Address: | "Ceit, Manuel Lardizabal 15, 20018, Donostia/San Sebastian, Spain. Universidad de Navarra, Tecnun, Manuel Lardizabal 13, 20018, Donostia/San Sebastian, Spain. Analytical Microsystems & Materials for Lab-on-a-Chip (AMMa-LOAC) Group, Microfluidics Cluster UPV/EHU, Analytical Chemistry Department, University of the Basque Country UPV/EHU, Leioa, Spain. Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, Albert Einstein 48, 01510, Vitoria-Gasteiz, Spain. mmorant@cicenergigune.com" |
| DOI: | 10.1007/s00604-020-04625-9 |
| ISSN/ISBN: | 1436-5073 (Electronic) 0026-3672 (Linking) |
| Abstract: | "A room temperature benzene and formaldehyde gas sensor system with an ionogel as sensing material is presented. The sensing layer is fabricated employing poly(N-isopropylacrylamide) polymerized in the presence of 1-ethyl-3-methylimidazolium ethyl sulfate ionic liquid onto gold interdigitated electrodes. When the ionogel is exposed to increasing formaldehyde concentrations employing N(2) as a carrier gas, a more stable response is observed in comparison to the bare ionic liquid, but no difference in sensitivity occurs. On the other hand, when air is used as carrier gas the sensitivity of the system towards formaldehyde is decreased by one order of magnitude. At room temperature, the proposed sensor exhibited in air higher sensitivities to benzene, at concentrations ranging between 4 and 20 ppm resulting, in a limit of detection of 47 ppb, which is below the standard permitted concentrations. The selectivity of the IL towards HCHO and C(6)H(6) is demonstrated by the absence of response when another IL is employed. Humidity from the ambient air slightly affects the resistance of the system proving the protective role of the polymeric matrix. Furthermore, the gas sensor system showed fast response/recovery times considering the thickness of the material, suggesting that ionogel materials can be used as novel and highly efficient volatile organic compounds sensors operating at room temperature.Graphical abstract" |
| Keywords: | Acrylic Resins/chemistry Benzene/*analysis Electrodes Formaldehyde/*analysis Gels/*chemistry Imidazoles/*chemistry Limit of Detection *Temperature Volatile Organic Compounds/analysis Electrochemical gas sensor Ionic liquid Ionogel Volatile organic compoun; |
| Notes: | "MedlineGil-Gonzalez, Nerea Benito-Lopez, F Castano, E Morant-Minana, Maria C eng TEMIN-AIR/Ministerio de Economia y Competitividad/ BIO2016-80417-P/Ministerio de Economia y Competitividad/ IT1271-1/Gobierno Vasco Dpto. Educacion/ Research Support, Non-U.S. Gov't Austria 2020/11/05 Mikrochim Acta. 2020 Nov 4; 187(12):638. doi: 10.1007/s00604-020-04625-9" |
