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In this work, ionogels were designed to act as a sensitive layer for the detection of volatiles in a custom-made electronic nose. Ionogels composed of gelatin and a single imidazolium ionic liquid were doped with bare and functionalized iron oxide nanoparticles, producing ionogels with adjustable target selectivity. After exposing an array of four ionogels to 12 distinct volatile organic compounds, the collected signals were analyzed by principal component analysis (PCA) and by several supervised classification methods, in order to assess the ability of the electronic nose to distinguish different volatiles, which showed accuracy above 98%.<\/jats:p>","DOI":"10.3390\/chemosensors9080201","type":"journal-article","created":{"date-parts":[[2021,7,30]],"date-time":"2021-07-30T12:59:24Z","timestamp":1627649964000},"page":"201","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Ionogels Based on a Single Ionic Liquid for Electronic Nose Application"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4768-0803","authenticated-orcid":false,"given":"Wellington B.","family":"Gon\u00e7alves","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica Fundamental, Instituto de Qu\u00edmica, Universidade de S\u00e3o Paulo, Av. Prof. Lineu Prestes, 748, S\u00e3o Paulo 05508-000, SP, Brazil"}]},{"given":"Evelyn P.","family":"Cervantes","sequence":"additional","affiliation":[{"name":"Departamento de Ci\u00eancia da Computa\u00e7\u00e3o, Instituto de Matem\u00e1tica e Estat\u00edstica, Universidade de S\u00e3o Paulo, Rua do Mat\u00e3o, 1010, S\u00e3o Paulo 05508-090, SP, Brazil"}]},{"given":"Ana C. C. S.","family":"P\u00e1dua","sequence":"additional","affiliation":[{"name":"UCIBIO, Departamento de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Gon\u00e7alo","family":"Santos","sequence":"additional","affiliation":[{"name":"UCIBIO, Departamento de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1851-8110","authenticated-orcid":false,"given":"Susana I. C. J.","family":"Palma","sequence":"additional","affiliation":[{"name":"UCIBIO, Departamento de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Rosamaria W. C.","family":"Li","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Fundamental, Instituto de Qu\u00edmica, Universidade de S\u00e3o Paulo, Av. Prof. Lineu Prestes, 748, S\u00e3o Paulo 05508-000, SP, Brazil"},{"name":"Centro Universit\u00e1rio UniBTA, Rua Afonso Sardinha, 201, S\u00e3o Paulo 05076-000, SP, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4586-3024","authenticated-orcid":false,"given":"Ana C. A.","family":"Roque","sequence":"additional","affiliation":[{"name":"UCIBIO, Departamento de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2832-0199","authenticated-orcid":false,"given":"Jonas","family":"Gruber","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Fundamental, Instituto de Qu\u00edmica, Universidade de S\u00e3o Paulo, Av. Prof. Lineu Prestes, 748, S\u00e3o Paulo 05508-000, SP, Brazil"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"44","DOI":"10.4236\/gsc.2014.41008","article-title":"A Review of Ionic Liquids, Their Limits and Applications","volume":"4","author":"Ghandi","year":"2014","journal-title":"Green Sustain. Chem."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"745","DOI":"10.1515\/pac-2016-1008","article-title":"Ionic liquid solvents: The importance of microscopic interactions in predicting organic reaction outcomes","volume":"89","author":"Keaveney","year":"2017","journal-title":"Pure Appl. Chem."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"646","DOI":"10.1007\/BF03246053","article-title":"3-Methyl-1-sulfonic acid imidazolium chloride as a new, Efficient and recyclable catalyst and solvent for the preparation of N-sulfonyl imines at room Temperature","volume":"7","author":"Zolfigol","year":"2010","journal-title":"J. Iran. Chem. Soc."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"5567","DOI":"10.1016\/j.electacta.2006.03.016","article-title":"Ionic liquids as electrolytes","volume":"51","author":"Lewandowski","year":"2006","journal-title":"Electrochim. Acta"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"330","DOI":"10.1016\/j.molliq.2018.06.081","article-title":"Recent progress in ionic liquid membranes for gas separation","volume":"266","author":"Sasikumar","year":"2018","journal-title":"J. Mol. Liq."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"907","DOI":"10.1039\/C0CS00059K","article-title":"Ionogels, ionic liquid based hybrid materials","volume":"40","author":"Viau","year":"2011","journal-title":"Chem. Soc. Rev."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"344","DOI":"10.14314\/polimery.2017.344","article-title":"Ionogels\u2014Materials containing immobilized ionic liquids","volume":"62","author":"Andrzejewska","year":"2017","journal-title":"Polimery"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"228","DOI":"10.1039\/B913879J","article-title":"Ionogels as drug delivery system: One-step sol\u2013gel synthesis using imidazolium ibuprofenate ionic liquid","volume":"46","author":"Viau","year":"2010","journal-title":"Chem. Commun."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Zhao, K., Song, H., Duan, X., Wang, Z., Liu, J., and Ba, X. (2019). Novel Chemical Cross-Linked Ionogel Based on Acrylate Terminated Hyperbranched Polymer with Superior Ionic Conductivity for High Performance Lithium-Ion Batteries. 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Res."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Ersoez, B., Bauersfeld, M.-L., and W\u00f6llenstein, J. (2016). Ionogel\u2014Based Composite Material for CO2 Sensing Deposited on a Chemiresistive Transducer. Proceedings, 1.","DOI":"10.3390\/proceedings1040314"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"179","DOI":"10.1016\/j.apcata.2010.09.022","article-title":"Supported ionic liquid phase catalysis for aerobic oxidation of primary alcohols","volume":"389","author":"Chrobok","year":"2010","journal-title":"Appl. Catal. A"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"5192","DOI":"10.1021\/acssuschemeng.7b04832","article-title":"Insight in the Alginate Pd-Ionogels\u2014Application to the Tsuji\u2013Trost Reaction","volume":"6","author":"Vittoz","year":"2018","journal-title":"ACS Sustain. Chem. Eng."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"128025","DOI":"10.1016\/j.snb.2020.128025","article-title":"Biopolymer based ionogels as active layers in low-cost gas sensors for electronic noses","volume":"315","author":"Netto","year":"2020","journal-title":"Sens. Actuators B Chem."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2700","DOI":"10.1080\/10408398.2017.1327419","article-title":"Advances of electronic nose and its application in fresh foods: A review","volume":"58","author":"Shi","year":"2018","journal-title":"Crit. Rev. Food Sci. Nutr."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"104858","DOI":"10.1016\/j.compag.2019.104858","article-title":"Peach growth cycle monitoring using an electronic nose","volume":"163","author":"Vos","year":"2019","journal-title":"Comput. Electron. Agric."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"104202","DOI":"10.1016\/j.dib.2019.104202","article-title":"Electronic nose dataset for detection of wine spoilage thresholds","volume":"25","author":"Gamboa","year":"2019","journal-title":"Data Br."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"735","DOI":"10.1016\/j.measurement.2019.06.005","article-title":"Freshness Assessment of Broccoli using Electronic Nose","volume":"145","author":"Ezhilan","year":"2019","journal-title":"Measurement"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"John, A.T., Murugappan, K., Nisbet, D.R., and Tricoli, A. (2021). An Outlook of Recent Advances in Chemiresistive Sensor-Based Electronic Nose Systems for Food Quality and Environmental Monitoring. Sensors, 21.","DOI":"10.3390\/s21072271"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"109945","DOI":"10.1039\/C6RA22246C","article-title":"Wood identification by a portable low-cost polymer-based electronic nose","volume":"6","author":"Cordeiro","year":"2016","journal-title":"RSC Adv."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"520","DOI":"10.14429\/dsj.70.14584","article-title":"Trace Detection of Nerve Agent Simulant in the Fuel Vapour Environment using Metal Oxide\/Surface Acoustic Wave E-Nose","volume":"70","author":"Kumar","year":"2020","journal-title":"Def. Sci. J."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1016\/j.talanta.2015.06.050","article-title":"Application of electronic nose for industrial odors and gaseous emissions measurement and monitoring\u2014An overview","volume":"144","author":"Deshmukh","year":"2015","journal-title":"Talanta"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"7350","DOI":"10.1109\/TIE.2017.2694353","article-title":"Sensor Array Optimization of Electronic Nose for Detection of Bacteria in Wound Infection","volume":"64","author":"Sun","year":"2017","journal-title":"IEEE Trans. Ind. Electron."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"852","DOI":"10.1021\/acssensors.6b00309","article-title":"Rapid Diagnosis of Tuberculosis from Analysis of Urine Volatile Organic Compounds","volume":"1","author":"Lim","year":"2016","journal-title":"ACS Sens."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1610","DOI":"10.2174\/1568026616666151223113540","article-title":"Electronic Nose and Exhaled Breath NMR-based Metabolomics Applications in Airways Disease","volume":"16","author":"Santini","year":"2016","journal-title":"Curr. Top. Med. Chem."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"108231","DOI":"10.1016\/j.compositesb.2020.108231","article-title":"Buckypaper and its composites for aeronautic applications","volume":"199","author":"Xia","year":"2020","journal-title":"Compos. Part B Eng."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"835","DOI":"10.1177\/0731684419849708","article-title":"Hybrid composites for automotive applications\u2014A review","volume":"38","author":"Ravishankar","year":"2019","journal-title":"J. Reinf. Plast Compos."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Park, S.J., Park, C.S., and Yoon, H. (2017). Chemo-Electrical Gas Sensors Based on Conducting Polymer Hybrids. Polymers, 9.","DOI":"10.3390\/polym9050155"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"395","DOI":"10.1016\/j.sna.2018.11.048","article-title":"Wearable electronic nose for human skin odor identification: A preliminary study","volume":"285","author":"Zheng","year":"2019","journal-title":"Sens. Actuators A Phys."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Swe, M.M., Eamsa-Ard, T., Srikhirin, T., and Kerdcharoen, T. (2019, January 12\u201314). Monitoring the Freshness Level of Beef Using Nanocomposite Gas Sensors in Electronic nose. Proceedings of the 2019 IEEE International Conference on Consumer Electronics\u2014Asia (ICCE-Asia), Bangkok, Thailand.","DOI":"10.1109\/ICCE-Asia46551.2019.8941605"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"696","DOI":"10.1039\/C3TC31496K","article-title":"Ion Jelly: A novel sensing material for gas sensors and electronic noses","volume":"2","author":"Carvalho","year":"2014","journal-title":"J. Mater. Chem. C"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1700803","DOI":"10.1002\/adfm.201700803","article-title":"Tunable Gas Sensing Gels by Cooperative Assembly","volume":"27","author":"Hussain","year":"2017","journal-title":"Adv. Funct. Mater."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"72","DOI":"10.1016\/j.foodcont.2018.01.025","article-title":"Tilapia Fish microbial spoilage monitored by a single optical gas sensor","volume":"89","author":"Semeano","year":"2018","journal-title":"Food Control"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"638","DOI":"10.1007\/s00604-020-04625-9","article-title":"Imidazole-based ionogel as room temperature benzene and formaldehyde sensor","volume":"187","year":"2020","journal-title":"Microchim. Acta"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1016\/j.jcis.2014.09.019","article-title":"Effects of phase transfer ligands on monodisperse iron oxide magnetic nanoparticles","volume":"437","author":"Palma","year":"2015","journal-title":"J. Colloid Interface Sci."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"572","DOI":"10.1021\/ed074p572","article-title":"A Low-Cost and High-Performance Conductivity Meter","volume":"74","author":"Gutz","year":"1997","journal-title":"J. Chem. Educ."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"3093","DOI":"10.1016\/j.apsusc.2009.11.079","article-title":"Re-examination of characteristic FTIR spectrum of secondary layer in bilayer oleic acid-coated Fe3O4 nanoparticles","volume":"256","author":"Yang","year":"2010","journal-title":"Appl. Surf. Sci."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"10187","DOI":"10.1039\/c2cp40216e","article-title":"Hydrogen bond dynamics in crystalline \u03b2-9-anthracene carboxylic acid\u2014a combined crystallographic and spectroscopic study","volume":"14","author":"Scholz","year":"2012","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"4142","DOI":"10.1021\/jp909513v","article-title":"Photodimerization of Crystalline 9-Anthracenecarboxylic Acid: A Nontopotactic Autocatalytic Transformation","volume":"114","author":"Busse","year":"2010","journal-title":"J. Phys. Chem. C"},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"Vidinha, P., Louren\u00e7o, N.M.T., Pinheiro, C., Br\u00e1s, A.R., Carvalho, T., Santos-Silva, T., Mukhopadhyay, A., Rom\u00e3o, M.J., Parola, J., and Dionisio, M. (2008). Ion jelly: A tailor-made conducting material for smart electrochemical devices. Chem. Commun., 5842\u20135844.","DOI":"10.1039\/b811647d"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"105","DOI":"10.1016\/j.snb.2014.05.075","article-title":"Chemiresistive ionogel sensor array for the detection and discrimination of volatile organic vapor","volume":"202","author":"Zhu","year":"2014","journal-title":"Sens. Actuators B Chem."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"1168","DOI":"10.1021\/ic951325x","article-title":"Hydrophobic, Highly Conductive Ambient-Temperature Molten Salts","volume":"35","author":"Dias","year":"1996","journal-title":"Inorg. Chem."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"2275","DOI":"10.1351\/pac200072122275","article-title":"Influence of chloride, water, and organic solvents on the physical properties of ionic liquids","volume":"72","author":"Seddon","year":"2000","journal-title":"Pure Appl. Chem."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1145\/1656274.1656278","article-title":"The WEKA data mining software","volume":"11","author":"Hall","year":"2009","journal-title":"ACM SIGKDD Explor. Newsl."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"85","DOI":"10.5572\/ajae.2020.14.2.85","article-title":"Conducting Polymer Nanofibers based Sensors for Organic and Inorganic Gaseous Compounds","volume":"14","author":"Mirzaei","year":"2020","journal-title":"Asian J. Atmos. Environ."}],"container-title":["Chemosensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2227-9040\/9\/8\/201\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:37:28Z","timestamp":1760164648000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2227-9040\/9\/8\/201"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,7,30]]},"references-count":47,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2021,8]]}},"alternative-id":["chemosensors9080201"],"URL":"https:\/\/doi.org\/10.3390\/chemosensors9080201","relation":{},"ISSN":["2227-9040"],"issn-type":[{"value":"2227-9040","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,7,30]]}}}