{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T14:53:51Z","timestamp":1773932031216,"version":"3.50.1"},"reference-count":39,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2020,1,5]],"date-time":"2020-01-05T00:00:00Z","timestamp":1578182400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003627","name":"Rural Development Administration","doi-asserted-by":"publisher","award":["Cooperative Research Program for Agriculture Science and Technology Development (Project No.PJ01281001)"],"award-info":[{"award-number":["Cooperative Research Program for Agriculture Science and Technology Development (Project No.PJ01281001)"]}],"id":[{"id":"10.13039\/501100003627","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Here, we fabricate ammonia sensors based on organic transistors by using poly(3-hexylthiophene) (P3HT) blended with tris(pentafluorophenyl)borane (TPFB) as an active layer. As TPFB is an efficient p-type dopant for P3HT, the current level of the blend films can be easily modulated by controlling the blend ratio. The devices exhibit significantly increased on-state and off-state current levels owing to the ohmic current originated from the large number of charge carriers when the active polymer layer contains TPFB with concentrations up to 20 wt % (P3HT:TPFB = 8:2). The current is decreased at 40 wt % of TPFB (P3HT:TPFB = 6:4). The P3HT:TPFB blend with a weight ratio of 9:1 exhibits the highest sensing performances for various concentrations of ammonia. The device exhibits an increased percentage current response compared to that of a pristine P3HT device. The current response of the P3HT:TPFB (9:1) device at 100 ppm of ammonia is as high as 65.8%, 3.2 times that of the pristine P3HT (20.3%). Furthermore, the sensor based on the blend exhibits a remarkable selectivity to ammonia with respect to acetone, methanol, and dichloromethane, owing to the strong interaction between the Lewis acid (TPFB) and Lewis base (ammonia).<\/jats:p>","DOI":"10.3390\/polym12010128","type":"journal-article","created":{"date-parts":[[2020,1,6]],"date-time":"2020-01-06T03:48:48Z","timestamp":1578282528000},"page":"128","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Selective Ammonia-Sensing Platforms Based on a Solution-Processed Film of Poly(3-Hexylthiophene) and p-Doping Tris(Pentafluorophenyl)Borane"],"prefix":"10.3390","volume":"12","author":[{"given":"Alem Araya","family":"Meresa","sequence":"first","affiliation":[{"name":"School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul 06974, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Felix Sunjoo","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul 06974, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,1,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"8612","DOI":"10.1039\/c3cs60127g","article-title":"Organic field-effect transistor sensors: A tutorial review","volume":"42","author":"Torsi","year":"2013","journal-title":"Chem. Soc. Rev."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2087","DOI":"10.1039\/C4CS00326H","article-title":"Organic field-effect transistor-based gas sensors","volume":"44","author":"Zhang","year":"2015","journal-title":"Chem. Soc. Rev."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"383","DOI":"10.1039\/C6NH00040A","article-title":"Electrical gas sensors based on structured organic ultra-thin films and nanocrystals on solid state substrates","volume":"1","author":"Huang","year":"2016","journal-title":"Nanoscale Horiz."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"489","DOI":"10.1007\/s13233-017-5108-7","article-title":"Organic thin film transistor with conjugated polymers for highly sensitive gas sensors","volume":"25","author":"Noh","year":"2017","journal-title":"Macromol. Res."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"3799","DOI":"10.1002\/adma.200902760","article-title":"Chemical and Physical Sensing by Organic Field-Effect Transistors and Related Devices","volume":"22","author":"Someya","year":"2010","journal-title":"Adv. Mater."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1705642","DOI":"10.1002\/adma.201705642","article-title":"Strategies for Improving the Performance of Sensors Based on Organic Field-Effect Transistors","volume":"30","author":"Wu","year":"2018","journal-title":"Adv. Mater."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"666","DOI":"10.1016\/j.snb.2004.11.054","article-title":"Ammonia sensors and their applications\u2014A review","volume":"107","author":"Timmer","year":"2005","journal-title":"Sens. Actuators B Chem."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"14650","DOI":"10.1021\/ja305287p","article-title":"Highly Sensitive NH3 Detection Based on Organic Field-Effect Transistors with Tris(pentafluorophenyl)borane as Receptor","volume":"134","author":"Huang","year":"2012","journal-title":"J. Am. Chem. Soc."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/0379-6779(90)90135-8","article-title":"Determination of field-effect mobility of poly (3-hexylthiophene) upon exposure to NH3 gas","volume":"37","author":"Assadi","year":"1990","journal-title":"Synth. Met."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"3563","DOI":"10.1021\/nl072314r","article-title":"Chemical sensing using nanostructured polythiophene transistors","volume":"8","author":"Li","year":"2008","journal-title":"Nano Lett."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"13554","DOI":"10.1021\/acs.langmuir.7b02466","article-title":"Highly sensitive ammonia gas sensor based on single-crystal poly (3-hexylthiophene)(P3HT) organic field effect transistor","volume":"33","author":"Mun","year":"2017","journal-title":"Langmuir"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"40","DOI":"10.1016\/j.snb.2010.02.019","article-title":"The response characteristics of a gas sensor based on poly-3-hexylithiophene thin-film transistors","volume":"146","author":"Jeong","year":"2010","journal-title":"Sens. Actuators B Chem."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"962","DOI":"10.1016\/j.snb.2012.06.010","article-title":"Poly-3-hexylthiophene based organic field-effect transistor: Detection of low concentration of ammonia","volume":"171","author":"Tiwari","year":"2012","journal-title":"Sens. Actuators B Chem."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"2859","DOI":"10.1021\/acs.analchem.6b04045","article-title":"Trace Ammonia Sensors Based on Fluorescent Near-Infrared-Emitting aza-BODIPY Dyes","volume":"89","author":"Strobl","year":"2017","journal-title":"Anal. Chem."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"775","DOI":"10.1007\/s13233-018-6079-z","article-title":"Liquid Sensing of a M-13 Bacteriophage-Based Colorimetric Sensor","volume":"26","author":"Moon","year":"2018","journal-title":"Macromol. Res."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"5312","DOI":"10.1039\/C7RA13516E","article-title":"Highly transparent and flexible polyaniline mesh sensor for chemiresistive sensing of ammonia gas","volume":"8","author":"Cai","year":"2018","journal-title":"RSC Adv."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"511","DOI":"10.1007\/s13233-018-6069-1","article-title":"Highly Ammonia Sensing Using Direct In Situ Electro-Deposited Polypyrrole-Dodecylbenzene Sulfonic Acid Film on ITO Coated Flexible Substrates","volume":"26","author":"Merdj","year":"2018","journal-title":"Macromol. Res."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1900719","DOI":"10.1002\/admi.201900719","article-title":"A Solid-State Aqueous Electrolyte-Gated Field-Effect Transistor as a Low-Voltage Operation Pressure-Sensitive Platform","volume":"6","author":"Zhang","year":"2019","journal-title":"Adv. Mater. Interfaces"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"412","DOI":"10.1038\/nmat2167","article-title":"A sensitivity-enhanced field-effect chiral sensor","volume":"7","author":"Torsi","year":"2008","journal-title":"Nat. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1701117","DOI":"10.1002\/adfm.201701117","article-title":"Solution-Processed Nanoporous Organic Semiconductor Thin Films: Toward Health and Environmental Monitoring of Volatile Markers","volume":"27","author":"Zhang","year":"2017","journal-title":"Adv. Funct. Mater."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"4752","DOI":"10.1038\/ncomms5752","article-title":"Enhancing 2D growth of organic semiconductor thin films with macroporous structures via a small-molecule heterointerface","volume":"5","author":"Kang","year":"2014","journal-title":"Nat. Commun."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Park, M.S., Meresa, A.A., Kwon, C.-M., and Kim, F.S. (2019). Selective Wet-Etching of Polymer\/Fullerene Blend Films for Surface-and Nanoscale Morphology-Controlled Organic Transistors and Sensitivity-Enhanced Gas Sensors. Polymers, 11.","DOI":"10.3390\/polym11101682"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"2229","DOI":"10.1063\/1.1360785","article-title":"Electronic sensing of vapors with organic transistors","volume":"78","author":"Crone","year":"2001","journal-title":"Appl. Phys. Lett."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"7589","DOI":"10.1021\/jp0344951","article-title":"Side-Chain Role in Chemically Sensing Conducting Polymer Field-Effect Transistors","volume":"107","author":"Torsi","year":"2003","journal-title":"J. Phys. Chem. B"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"76","DOI":"10.1016\/j.orgel.2015.04.001","article-title":"High-performance diketopyrrolopyrrole-based organic field-effect transistors for flexible gas sensors","volume":"23","author":"Ryu","year":"2015","journal-title":"Org. Electron."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"3221","DOI":"10.1016\/j.orgel.2014.08.023","article-title":"Printable ammonia sensor based on organic field effect transistor","volume":"15","author":"Besar","year":"2014","journal-title":"Org. Electron."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1016\/j.snb.2015.11.005","article-title":"Poly(3-hexylthiophene)\/polystyrene (P3HT\/PS) blends based organic field-effect transistor ammonia gas sensor","volume":"225","author":"Han","year":"2016","journal-title":"Sens. Actuators B Chem."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"6570","DOI":"10.1021\/acsami.6b00471","article-title":"Morphology-driven high-performance polymer transistor-based ammonia gas sensor","volume":"8","author":"Yu","year":"2016","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1016\/j.orgel.2017.05.040","article-title":"Electrical and ammonia gas sensing properties of poly (3, 3\u2034-dialkylquaterthiophene) based organic thin film transistors fabricated by floating-film transfer method","volume":"48","author":"Kumar","year":"2017","journal-title":"Org. Electron."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1600204","DOI":"10.1002\/aelm.201600204","article-title":"p-Type Doping of Poly(3-hexylthiophene) with the Strong Lewis Acid Tris(pentafluorophenyl)borane","volume":"2","author":"Pingel","year":"2016","journal-title":"Adv. Electron. Mater."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"8016","DOI":"10.1021\/acs.chemmater.6b03761","article-title":"Doping of Large Ionization Potential Indenopyrazine Polymers via Lewis Acid Complexation with Tris(pentafluorophenyl)borane: A Simple Method for Improving the Performance of Organic Thin-Film Transistors","volume":"28","author":"Han","year":"2016","journal-title":"Chem. Mater."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"4632","DOI":"10.1021\/ja110968m","article-title":"Lewis acid adducts of narrow band gap conjugated polymers","volume":"133","author":"Welch","year":"2011","journal-title":"J. Am. Chem. Soc."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"5497","DOI":"10.1039\/C8TC01076E","article-title":"Simultaneous enhancement of charge density and molecular stacking order of polymer semiconductors by viologen dopants for high performance organic field-effect transistors","volume":"6","author":"Lee","year":"2018","journal-title":"J. Mater. Chem. C"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1700290","DOI":"10.1002\/advs.201700290","article-title":"Remarkable Enhancement of the Hole Mobility in Several Organic Small-Molecules, Polymers, and Small-Molecule:Polymer Blend Transistors by Simple Admixing of the Lewis Acid p-Dopant B(C6F5)3","volume":"5","author":"Panidi","year":"2018","journal-title":"Adv. Sci."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"7495","DOI":"10.1002\/anie.201202570","article-title":"Color Tuning in Polymer Light-Emitting Diodes with Lewis Acids","volume":"51","author":"Zalar","year":"2012","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1703672","DOI":"10.1002\/aenm.201703672","article-title":"Lewis Acid Doping Induced Synergistic Effects on Electronic and Morphological Structure for Donor and Acceptor in Polymer Solar Cells","volume":"8","author":"Yan","year":"2018","journal-title":"Adv. Energy Mater."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Park, M.S., and Kim, F.S. (2019). Synergistic Effects of Processing Additives and Thermal Annealing on Nanomorphology and Hole Mobility of Poly (3-hexylthiophene) Thin Films. Polymers, 11.","DOI":"10.3390\/polym11010112"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"20671","DOI":"10.1038\/srep20671","article-title":"Unencapsulated air-stable organic field effect transistor by all solution processes for low power vapor sensing","volume":"6","author":"Feng","year":"2016","journal-title":"Sci. Rep."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Laurence, C., and Gal, J.-F. (2009). Lewis Basicity and Affinity Scales: Data and Measurement, John Wiley & Sons.","DOI":"10.1002\/9780470681909"}],"container-title":["Polymers"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4360\/12\/1\/128\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:28:50Z","timestamp":1760362130000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4360\/12\/1\/128"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,1,5]]},"references-count":39,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2020,1]]}},"alternative-id":["polym12010128"],"URL":"https:\/\/doi.org\/10.3390\/polym12010128","relation":{},"ISSN":["2073-4360"],"issn-type":[{"value":"2073-4360","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,1,5]]}}}