{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T08:00:48Z","timestamp":1772265648073,"version":"3.50.1"},"reference-count":43,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2024,3,6]],"date-time":"2024-03-06T00:00:00Z","timestamp":1709683200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Basic Science Research Program through the National 245 Research Foundation of Korea (NRF)","award":["2018R1A6A1A03026005"],"award-info":[{"award-number":["2018R1A6A1A03026005"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this study, a room-temperature ammonia gas sensor using a ZnO and reduced graphene oxide (rGO) composite is developed. The sensor fabrication involved the innovative application of reverse offset and electrostatic spray deposition (ESD) techniques to create a ZnO\/rGO sensing platform. The structural and chemical characteristics of the resulting material were comprehensively analyzed using XRD, FT-IR, FESEM, EDS, and XPS, and rGO reduction was achieved via UV\u2013ozone treatment. Electrical properties were assessed through I\u2013V curves, demonstrating enhanced conductivity due to UV\u2013ozone treatment and improved charge mobility from the formation of a ZnO\u2013rGO heterojunction. Exposure to ammonia gas resulted in increased sensor responsiveness, with longer UV\u2013ozone treatment durations yielding superior sensitivity. Furthermore, response and recovery times were measured, with the 10 min UV\u2013ozone-treated sensor displaying optimal responsiveness. Performance evaluation revealed linear responsiveness to ammonia concentration with a high R2 value. The sensor also exhibited exceptional selectivity for ammonia compared to acetone and CO gases, making it a promising candidate for ammonia gas detection. This study shows the outstanding performance and potential applications of the ZnO\/rGO-based ammonia gas sensor, promising significant contributions to the field of gas detection.<\/jats:p>","DOI":"10.3390\/s24051691","type":"journal-article","created":{"date-parts":[[2024,3,6]],"date-time":"2024-03-06T04:03:50Z","timestamp":1709697830000},"page":"1691","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Fabrication of a Fully Printed Ammonia Gas Sensor Based on ZnO\/rGO Using Ultraviolet\u2013Ozone Treatment"],"prefix":"10.3390","volume":"24","author":[{"given":"Mijin","family":"Won","sequence":"first","affiliation":[{"name":"Department of Creative Convergence Engineering, Hanbat National University, Yuseong-gu, Daejeon 305-719, Republic of Korea"}]},{"given":"Jaeho","family":"Sim","sequence":"additional","affiliation":[{"name":"Department of Creative Convergence Engineering, Hanbat National University, Yuseong-gu, Daejeon 305-719, Republic of Korea"}]},{"given":"Gyeongseok","family":"Oh","sequence":"additional","affiliation":[{"name":"Department of Creative Convergence Engineering, Hanbat National University, Yuseong-gu, Daejeon 305-719, Republic of Korea"}]},{"given":"Minhun","family":"Jung","sequence":"additional","affiliation":[{"name":"Research Institute of Printed Electronics & 3D Printing, Hanbat National University, Yuseng-gu, Daejeon 305-719, Republic of Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0716-1272","authenticated-orcid":false,"given":"Snigdha Paramita","family":"Mantry","sequence":"additional","affiliation":[{"name":"Research Institute of Printed Electronics & 3D Printing, Hanbat National University, Yuseng-gu, Daejeon 305-719, Republic of Korea"}]},{"given":"Dong-soo","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Creative Convergence Engineering, Hanbat National University, Yuseong-gu, Daejeon 305-719, Republic of Korea"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"295","DOI":"10.4236\/aces.2016.64030","article-title":"Enhancing nutrient use efficiency using zeolites minerals\u2014A review","volume":"6","author":"Polidoro","year":"2016","journal-title":"Adv. Chem. Eng. Sci."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"581","DOI":"10.1016\/j.energy.2012.07.041","article-title":"Experimental studies on an air-cooled two-stage NH3-H2O solar absorption air-conditioning prototype","volume":"45","author":"Du","year":"2012","journal-title":"Energy"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"419","DOI":"10.1016\/j.scitotenv.2018.12.236","article-title":"Roles of ammonia-oxidizing bacteria in improving metabolism and cometabolism of trace organic chemicals in biological wastewater treatment processes: A review","volume":"659","author":"Kumwiba","year":"2019","journal-title":"Sci. Total Environ."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"435","DOI":"10.1021\/acscatal.0c03985","article-title":"Regenerative electrocatalytic redox cycle of copper sulfide for sustainable NH3 production under ambient conditions","volume":"11","author":"Kim","year":"2020","journal-title":"ACS Catal."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"131755","DOI":"10.1016\/j.snb.2022.131755","article-title":"Metal-organic frameworks-derived In2O3 microtubes\/Ti3C2Tx MXene composites for NH3 detection at room temperature","volume":"361","author":"Liu","year":"2022","journal-title":"Sens. Actuators B Chem."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"4047","DOI":"10.1109\/JSEN.2019.2963269","article-title":"Poly [2, 5-bis (3-tetradecylthiophen-2-yl) thieno [3, 2-b] thiophene] organic polymer based-interdigitated channel enabled thin film transistor for detection of selective low ppm ammonia sensing at 25 \u00b0C","volume":"20","author":"Singh","year":"2019","journal-title":"IEEE Sens. J."},{"key":"ref_7","unstructured":"Padappayil, R.P., and Borger, J. (2022). StatPearls, StatPearls Publishing."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"115675","DOI":"10.1016\/j.taap.2021.115675","article-title":"Immunosuppression, oxidative stress, and apoptosis in pig kidney caused by ammonia: Application of transcriptome analysis in risk assessment of ammonia exposure","volume":"428","author":"Zhang","year":"2021","journal-title":"Toxicol. Appl. Pharmacol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1016\/S0269-7491(01)00145-2","article-title":"Introduction: Fluxes and impacts of atmospheric ammonia on national, landscape and farm scales","volume":"119","author":"Sutton","year":"2002","journal-title":"Environ. Pollut."},{"key":"ref_10","unstructured":"Agency for Toxic Substances and Disease Registry (Atsdr) (2017). Medical Management Guidelines for Ammonia."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Bielecki, Z., Stacewicz, T., Smulko, J., and Wojtas, J. (2020). Ammonia gas sensors: Comparison of solid-state and optical methods. Appl. Sci., 10.","DOI":"10.3390\/app10155111"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"116860","DOI":"10.1016\/j.synthmet.2021.116860","article-title":"Review on the utilisation of sensing materials for intrinsic optical NH3 gas sensors","volume":"280","author":"Ismail","year":"2021","journal-title":"Synth. Met."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"605","DOI":"10.1080\/21870764.2020.1769820","article-title":"Low-cost ultra-sensitive SnO2-based ammonia sensor synthesized by hydrothermal method","volume":"8","author":"Gavaskar","year":"2020","journal-title":"J. Asian Ceram. Soc."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"2648","DOI":"10.1007\/s11664-018-6099-7","article-title":"Influence of different aluminum sources on the NH3 gas-sensing properties of ZnO thin films","volume":"47","author":"Ozutok","year":"2018","journal-title":"J. Electron. Mater."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"067002","DOI":"10.1149\/2162-8777\/ac7822","article-title":"A Room-temperature TiO2-based ammonia gas sensor with three-dimensional through-silicon-via structure","volume":"11","author":"Yeh","year":"2022","journal-title":"ECS J. Solid State Sci. Technol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"160472","DOI":"10.1016\/j.jallcom.2021.160472","article-title":"Metal-organic framework-derived Cr-doped hollow In2O3 nanoboxes with excellent gas-sensing performance toward ammonia","volume":"879","author":"Sun","year":"2021","journal-title":"J. Alloys Compd."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"319","DOI":"10.1016\/j.mssp.2014.07.009","article-title":"Effect of indium doping on ZnO based-gas sensor for CO","volume":"27","author":"Hjiri","year":"2014","journal-title":"Mater. Sci. Semicond. Process."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"238","DOI":"10.1016\/j.spmi.2014.03.029","article-title":"Influence of film thickness on the properties of sprayed ZnO thin films for gas sensor applications","volume":"71","author":"Mariappan","year":"2014","journal-title":"Superlattices Microstruct."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1016\/j.surfin.2016.06.004","article-title":"Cost-effective nebulizer sprayed ZnO thin films for enhanced ammonia gas sensing\u2013Effect of deposition temperature","volume":"1","author":"Ravichandran","year":"2016","journal-title":"Surf. Interfaces"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"148","DOI":"10.1016\/j.snb.2019.04.046","article-title":"Ammonia sensing performance of a platinum nanoparticle-decorated tungsten trioxide gas sensor","volume":"291","author":"Liu","year":"2019","journal-title":"Sens. Actuators B Chem."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"206","DOI":"10.1016\/j.mseb.2017.12.036","article-title":"Semiconductor metal oxide gas sensors: A review","volume":"229","author":"Dey","year":"2018","journal-title":"Mater. Sci. Eng. B"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"126684","DOI":"10.1016\/j.snb.2019.126684","article-title":"Room-temperature-operated fast and reversible vertical-heterostructure-diode gas sensor composed of reduced graphene oxide and AlGaN\/GaN","volume":"296","author":"Bag","year":"2019","journal-title":"Sens. Actuators B Chem."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"130373","DOI":"10.1016\/j.snb.2021.130373","article-title":"A stretchable, room-temperature operable, chemiresistive gas sensor using nanohybrids of reduced graphene oxide and zinc oxide nanorods","volume":"345","author":"Moon","year":"2021","journal-title":"Sens. Actuators B Chem."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"4396","DOI":"10.1021\/cm0630800","article-title":"Single sheet functionalized graphene by oxidation and thermal expansion of graphite","volume":"19","author":"McAllister","year":"2007","journal-title":"Chem. Mater."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"26252","DOI":"10.1021\/acsami.7b05422","article-title":"Graphene oxide by UV-ozone treatment as an efficient hole extraction layer for highly efficient and stable polymer solar cells","volume":"9","author":"Xia","year":"2017","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1016\/j.orgel.2018.04.050","article-title":"Moderately reduced graphene oxide via UV-ozone treatment as hole transport layer for high efficiency organic solar cells","volume":"59","author":"Rafique","year":"2018","journal-title":"Org. Electron."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"105683","DOI":"10.1016\/j.orgel.2020.105683","article-title":"Highly efficient and bright red quantum dot light-emitting diodes with balanced charge injection","volume":"81","author":"Lei","year":"2020","journal-title":"Org. Electron."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Lee, H., Cho, N.-J., and Kim, D.S. (2022). Development of a Novel Reverse Offset Printer Equipped with Double-Layer Blanket (DLB) for Micropattern Printing on 3D Curved Surfaces. Processes, 10.","DOI":"10.3390\/pr10020424"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"567","DOI":"10.7736\/KSPE.2013.30.6.567","article-title":"Development of spray thin film coating method using an air pressure and electrostatic force","volume":"30","author":"Kim","year":"2013","journal-title":"J. Korean Soc. Precis. Eng."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"3073","DOI":"10.1007\/s10904-020-01465-1","article-title":"Wettability of Graphene Oxide\/Zinc Oxide Nanocomposite on Aluminum Surface Switching by UV Irradiation and Low Temperature Annealing","volume":"30","author":"Majidi","year":"2020","journal-title":"J. Inorg. Organomet. Polym. Mater."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"2786","DOI":"10.1021\/acsomega.1c05565","article-title":"Synthesis and characterization of rGO@ ZnO nanocomposites for esterification of acetic acid","volume":"7","author":"Alharthi","year":"2022","journal-title":"ACS Omega"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"17545","DOI":"10.1007\/s10854-021-06287-6","article-title":"Low power and stable resistive switching in graphene oxide-based RRAM embedded with ZnO nanoparticles for nonvolatile memory applications","volume":"32","author":"Singh","year":"2021","journal-title":"J. Mater. Sci. Mater. Electron."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"129331","DOI":"10.1016\/j.colsurfa.2022.129331","article-title":"Fabrication of GO\/ZnO nanocomposite incorporated patch for enhanced wound healing in streptozotocin (STZ) induced diabetic rats","volume":"649","author":"Prema","year":"2022","journal-title":"Colloids Surf. A Physicochem. Eng. Asp."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"108","DOI":"10.1504\/IJNT.2018.089542","article-title":"Synthesis of zinc oxide\/graphene oxide nanocomposite material for antibacterial application","volume":"15","author":"Trinh","year":"2018","journal-title":"Int. J. Nanotechnol."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1016\/j.physe.2013.10.029","article-title":"Investigation of reduced graphene oxide effects on ultra-violet detection of ZnO thin film","volume":"57","author":"Safa","year":"2014","journal-title":"Phys. E Low-Dimens. Syst. Nanostructures"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"107293","DOI":"10.1016\/j.jece.2022.107293","article-title":"Study of photocatalytic degradation efficiency of rGO\/ZnO nano-photocatalyst and their performance analysis using scanning Kelvin probe","volume":"10","author":"Singhal","year":"2020","journal-title":"J. Environ. Chem. Eng."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"2662","DOI":"10.1016\/S0008-6223(03)00325-7","article-title":"Surface spectroscopic study of basic sites on carbon blacks","volume":"41","author":"Darmstadt","year":"2005","journal-title":"Carbon"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"116710","DOI":"10.1016\/j.synthmet.2021.116710","article-title":"Fabrication of ZnO-MWCNT nanocomposite sensor and investigation of its ammonia gas sensing properties at room temperature","volume":"273","author":"Vatandoust","year":"2021","journal-title":"Synth. Met."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"130","DOI":"10.1186\/s11671-016-1343-7","article-title":"ZnO nanoparticles\/reduced graphene oxide bilayer thin films for improved NH3-sensing performances at room temperature","volume":"11","author":"Tai","year":"2016","journal-title":"Nanoscale Res. Lett."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"7599","DOI":"10.1021\/am4019109","article-title":"Chemically reduced graphene oxide for ammonia detection at room temperature","volume":"5","author":"Ghosh","year":"2013","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"27492","DOI":"10.1021\/acsomega.0c03981","article-title":"Chemoresistive room-temperature sensing of ammonia using zeolite imidazole framework and reduced graphene oxide (ZIF-67\/rGO) composite","volume":"5","author":"Garg","year":"2020","journal-title":"ACS Omega"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1799","DOI":"10.1039\/C9NA00048H","article-title":"Porous reduced graphene oxide (rGO)\/WO3 nanocomposites for the enhanced detection of NH3 at room temperature","volume":"1","author":"Jeevitha","year":"2019","journal-title":"Nanoscale Adv."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"9575","DOI":"10.1007\/s10853-021-05884-4","article-title":"A review on mechanisms and recent developments in pn heterojunctions of 2D materials for gas sensing applications","volume":"56","author":"Mathew","year":"2021","journal-title":"J. Mater. Sci."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/24\/5\/1691\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:09:49Z","timestamp":1760105389000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/24\/5\/1691"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,3,6]]},"references-count":43,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2024,3]]}},"alternative-id":["s24051691"],"URL":"https:\/\/doi.org\/10.3390\/s24051691","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,3,6]]}}}