{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T04:59:33Z","timestamp":1787029173314,"version":"build-2736575974"},"reference-count":57,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2023,7,28]],"date-time":"2023-07-28T00:00:00Z","timestamp":1690502400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Institute of Civil Military Technology Cooperation Center funded by the Defense Acquisition Program Administration and Ministry of Trade, Industry, and Energy of the Korean government","award":["20-CM-BR-05"],"award-info":[{"award-number":["20-CM-BR-05"]}]},{"name":"Institute of Civil Military Technology Cooperation Center funded by the Defense Acquisition Program Administration and Ministry of Trade, Industry, and Energy of the Korean government","award":["20018357"],"award-info":[{"award-number":["20018357"]}]},{"name":"Institute of Civil Military Technology Cooperation Center funded by the Defense Acquisition Program Administration and Ministry of Trade, Industry, and Energy of the Korean government","award":["NRF-2022R1C1C2006097"],"award-info":[{"award-number":["NRF-2022R1C1C2006097"]}]},{"name":"Technology Innovation Program","award":["20-CM-BR-05"],"award-info":[{"award-number":["20-CM-BR-05"]}]},{"name":"Technology Innovation Program","award":["20018357"],"award-info":[{"award-number":["20018357"]}]},{"name":"Technology Innovation Program","award":["NRF-2022R1C1C2006097"],"award-info":[{"award-number":["NRF-2022R1C1C2006097"]}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["20-CM-BR-05"],"award-info":[{"award-number":["20-CM-BR-05"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["20018357"],"award-info":[{"award-number":["20018357"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["NRF-2022R1C1C2006097"],"award-info":[{"award-number":["NRF-2022R1C1C2006097"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Toxic industrial chemicals (TICs), when accidentally released into the workplace or environment, often form a gaseous mixture that complicates detection and mitigation measures. However, most of the existing gas sensors are unsuitable for detecting such mixtures. In this study, we demonstrated the detection and identification of gaseous mixtures of TICs using a chemiresistor array of single-walled carbon nanotubes (SWCNTs). The array consists of three SWCNT chemiresistors coated with different molecular\/ionic species, achieving a limit of detection (LOD) of 2.2 ppb for ammonia (NH3), 820 ppb for sulfur dioxide (SO2), and 2.4 ppm for ethylene oxide (EtO). By fitting the concentration-dependent sensor responses to an adsorption isotherm, we extracted parameters that characterize each analyte-coating combination, including the proportionality and equilibrium constants for adsorption. Principal component analysis confirmed that the sensor array detected and identified mixtures of two TIC gases: NH3\/SO2, NH3\/EtO, and SO2\/EtO. Exposing the sensor array to three TIC mixtures with various EtO\/SO2 ratios at a fixed NH3 concentration showed an excellent correlation between the sensor response and the mixture composition. Additionally, we proposed concentration ranges within which the sensor array can effectively detect the gaseous mixtures. Being highly sensitive and capable of analyzing both individual and mixed TICs, our gas sensor array has great potential for monitoring the safety and environmental effects of industrial chemical processes.<\/jats:p>","DOI":"10.3390\/nano13152199","type":"journal-article","created":{"date-parts":[[2023,7,28]],"date-time":"2023-07-28T07:35:24Z","timestamp":1690529724000},"page":"2199","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Potential of Carbon Nanotube Chemiresistor Array in Detecting Gas-Phase Mixtures of Toxic Chemical Compounds"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3671-3868","authenticated-orcid":false,"given":"Seongwoo","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9922-8181","authenticated-orcid":false,"given":"Sanghwan","family":"Park","sequence":"additional","affiliation":[{"name":"School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-8799-9284","authenticated-orcid":false,"given":"Seongyeop","family":"Lim","sequence":"additional","affiliation":[{"name":"School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheongha","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chang Young","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea"},{"name":"Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,28]]},"reference":[{"key":"ref_1","first-page":"49","article-title":"Survey of toxic gas sensors and monitoring systems","volume":"32","author":"Korolkoff","year":"1989","journal-title":"Solid State Technol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1136\/oem.54.4.277","article-title":"Episode of toxic gas exposure in sewer workers","volume":"54","author":"Watt","year":"1997","journal-title":"Occup. Environ. Med."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"2100711","DOI":"10.1002\/admt.202100711","article-title":"Design and Integration of a Gas Sensor Module that Indicates the End of Service Life of a Gas Mask Canister","volume":"7","author":"Moon","year":"2022","journal-title":"Adv. Mater. Technol."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"19717","DOI":"10.1021\/jp0471857","article-title":"Chemically Functionalized Single-Walled Carbon Nanotubes as Ammonia Sensors","volume":"108","author":"Bekyarova","year":"2004","journal-title":"J. Phys. Chem. B"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"33976","DOI":"10.1039\/C9RA07186E","article-title":"Graphene chemiresistors modified with functionalized triphenylene for highly sensitive and selective detection of dimethyl methylphosphonate","volume":"9","author":"Kim","year":"2019","journal-title":"RSC Adv."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"e202200115","DOI":"10.1002\/anie.202200115","article-title":"Chemical Defect-Driven Response on Graphene-Based Chemiresistors for Sub-ppm Ammonia Detection","volume":"61","author":"Freddi","year":"2022","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"152326","DOI":"10.1016\/j.apsusc.2021.152326","article-title":"Green recycling of spent electrode of binder-free Cu supported Ag nanowires in gas sensor field: Attempt of turning waste into treasure for the rechargeable battery","volume":"581","author":"Xu","year":"2022","journal-title":"Appl. Surf. Sci."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1149\/07706.0121ecst","article-title":"GaN Based Carbon Dioxide Sensor","volume":"77","author":"Jung","year":"2017","journal-title":"ECS Trans."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"125004","DOI":"10.1149\/2162-8777\/ac451b","article-title":"(100) Plane \u03b2-Ga2O3 Flake Based Field Effect Transistor and Its Hydrogen Response","volume":"10","author":"Kim","year":"2021","journal-title":"ECS J. Solid State Sci. Technol."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"045010","DOI":"10.1149\/2162-8777\/ab8b72","article-title":"AlGaN\/GaN Heterostructure Based Hydrogen Sensor with Temperature Compensation","volume":"9","author":"Baik","year":"2020","journal-title":"ECS J. Solid State Sci. Technol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"8323","DOI":"10.1021\/acsami.5b12062","article-title":"MOF-Based Membrane Encapsulated ZnO Nanowires for Enhanced Gas Sensor Selectivity","volume":"8","author":"Drobek","year":"2016","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"5192","DOI":"10.1021\/la046867i","article-title":"Understanding the Dynamics of Signal Transduction for Adsorption of Gases and Vapors on Carbon Nanotube Sensors","volume":"21","author":"Lee","year":"2005","journal-title":"Langmuir"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1096","DOI":"10.1103\/PhysRevLett.85.1096","article-title":"Effects of gas adsorption and collisions on electrical transport in single-walled carbon nanotubes","volume":"85","author":"Sumanasekera","year":"2000","journal-title":"Phys. Rev. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Freddi, S., and Sangaletti, L. (2022). Trends in the Development of Electronic Noses Based on Carbon Nanotubes Chemiresistors for Breathomics. Nanomaterials, 12.","DOI":"10.3390\/nano12172992"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Ma, Y., Hou, M., Yang, L., Gao, J., Zhang, G., Guo, R., and Guo, S. (2023). Combinatorial Material Strategy: Parallel Synthesis and High-Throughput Screening of WO3 Nanoplates Decorated with Noble Metals for VOCs Sensor. Chemosensors, 11.","DOI":"10.3390\/chemosensors11040239"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Freddi, S., Vergari, M., Pagliara, S., and Sangaletti, L. (2023). A Chemiresistor Sensor Array Based on Graphene Nanostructures: From the Detection of Ammonia and Possible Interfering VOCs to Chemometric Analysis. Sensors, 23.","DOI":"10.3390\/s23020882"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"785","DOI":"10.2217\/nnm.13.64","article-title":"Nanomaterial-based sensors for detection of disease by volatile organic compounds","volume":"8","author":"Broza","year":"2013","journal-title":"Nanomedicine"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1016\/j.snb.2012.11.014","article-title":"Gas sensors using carbon nanomaterials: A review","volume":"179","author":"Llobet","year":"2013","journal-title":"Sens. Actuators B Chem."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"339","DOI":"10.1007\/s42823-021-00276-9","article-title":"A review of gas sensors based on carbon nanomaterial","volume":"32","author":"Raya","year":"2022","journal-title":"Carbon Lett."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Palac\u00edn, J., Mart\u00ednez, D., Clotet, E., Pallej\u00e0, T., Burgu\u00e9s, J., Fonollosa, J., Pardo, A., and Marco, S. (2019). Application of an Array of Metal-Oxide Semiconductor Gas Sensors in an Assistant Personal Robot for Early Gas Leak Detection. Sensors, 19.","DOI":"10.3390\/s19091957"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"129414","DOI":"10.1016\/j.snb.2020.129414","article-title":"Virtual sensor array based on MXene for selective detections of VOCs","volume":"331","author":"Li","year":"2021","journal-title":"Sens. Actuators B Chem."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"793","DOI":"10.1016\/j.snb.2018.12.097","article-title":"One-step electrospun SnO2\/MOx heterostructured nanomaterials for highly selective gas sensor array integration","volume":"283","author":"Song","year":"2019","journal-title":"Sens. Actuators B Chem."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"1159","DOI":"10.1039\/D0TA08743B","article-title":"High-performance gas sensor array for indoor air quality monitoring: The role of Au nanoparticles on WO3, SnO2, and NiO-based gas sensors","volume":"9","author":"Lee","year":"2021","journal-title":"J. Mater. Chem. A"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"833","DOI":"10.1016\/j.snb.2014.10.117","article-title":"Carbon nanotube gas sensor array for multiplex analyte discrimination","volume":"207","author":"Guerin","year":"2015","journal-title":"Sens. Actuators B Chem."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"351","DOI":"10.1016\/j.snb.2014.07.076","article-title":"A novel approach to fabricate metal oxide nanowire-like networks based coplanar gas sensors array for enhanced selectivity","volume":"204","author":"Yi","year":"2014","journal-title":"Sens. Actuators B Chem."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"129090","DOI":"10.1016\/j.snb.2020.129090","article-title":"Identification of gas mixtures via sensor array combining with neural networks","volume":"329","author":"Chu","year":"2021","journal-title":"Sens. Actuators B Chem."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"6020","DOI":"10.1109\/JSEN.2020.2972542","article-title":"Nanowire-Based Sensor Array for Detection of Cross-Sensitive Gases Using PCA and Machine Learning Algorithms","volume":"20","author":"Khan","year":"2020","journal-title":"IEEE Sens. J."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1016\/j.chemolab.2018.11.011","article-title":"On the optimization of the support vector machine regression hyperparameters setting for gas sensors array applications","volume":"184","author":"Laref","year":"2019","journal-title":"Chemom. Intell. Lab. Syst."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"127998","DOI":"10.1016\/j.snb.2020.127998","article-title":"SWCNTs-based MEMS gas sensor array and its pattern recognition based on deep belief networks of gases detection in oil-immersed transformers","volume":"312","author":"Tang","year":"2020","journal-title":"Sens. Actuators B Chem."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"111601","DOI":"10.1088\/1674-4926\/40\/11\/111601","article-title":"Smart gas sensor arrays powered by artificial intelligence","volume":"40","author":"Chen","year":"2019","journal-title":"J. Semicond."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1016\/S0925-4005(03)00477-5","article-title":"Detection of volatile organic compounds (VOCs) using SnO2 gas-sensor array and artificial neural network","volume":"96","author":"Srivastava","year":"2003","journal-title":"Sens. Actuators B Chem."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"105208","DOI":"10.1016\/j.rinp.2022.105208","article-title":"Highly sensitive and selective room-temperature gas sensors based on B6N6H6 monolayer for sensing SO2 and NH3: A first-principles study","volume":"33","author":"Yong","year":"2022","journal-title":"Results Phys."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"027007","DOI":"10.1149\/2162-8777\/abe3ce","article-title":"High-Performance PANI-Based Ammonia Gas Sensor Promoted by Surface Nanostructuralization","volume":"10","author":"Liu","year":"2021","journal-title":"ECS J. Solid State Sci. Technol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1007\/s00894-023-05547-y","article-title":"DFT study of adsorbing SO2, NO2, and NH3 gases based on pristine and carbon-doped Al24N24 nanocages","volume":"29","author":"Taha","year":"2023","journal-title":"J. Mol. Model."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1016\/j.tca.2008.09.013","article-title":"Reactivity of ethylene oxide in contact with basic contaminants","volume":"480","author":"Dinh","year":"2008","journal-title":"Thermochim. Acta"},{"key":"ref_36","unstructured":"Palassis, J. (2007). Preventing Worker Injuries and Deaths from Explosions in Industrial Ethylene Oxide Sterilization Facilities, National Institute for Occupational Safety and Health (NIOSH), the U.S. Environmental Protection Agency (EPA), and the Ethylene Oxide Sterilization Association (EOSA)."},{"key":"ref_37","unstructured":"Bretherick, L. (2017). Bretherick\u2019s Handbook of Reactive Chemical Hazards, Elsevier."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"16791","DOI":"10.1021\/jacs.7b09258","article-title":"Ionic Strength-Mediated Phase Transitions of Surface-Adsorbed DNA on Single-Walled Carbon Nanotubes","volume":"139","author":"Salem","year":"2017","journal-title":"J. Am. Chem. Soc."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1273","DOI":"10.1126\/science.1101243","article-title":"Transparent, Conductive Carbon Nanotube Films","volume":"305","author":"Wu","year":"2004","journal-title":"Science"},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Tang, R., Shi, Y., Hou, Z., and Wei, L. (2017). Carbon Nanotube-Based Chemiresistive Sensors. Sensors, 17.","DOI":"10.3390\/s17040882"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"1266","DOI":"10.1002\/anie.201505308","article-title":"Nanowire Chemical\/Biological Sensors: Status and a Roadmap for the Future","volume":"55","author":"Fennell","year":"2016","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"(2002). Toxic Industrial Chemicals. J. R. Army Med. Corps, 148, 371.","DOI":"10.1136\/jramc-148-04-06"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"55493","DOI":"10.1021\/acsami.0c17225","article-title":"Enhanced Gas Sensing Properties of Graphene Transistor by Reduced Doping with Hydrophobic Polymer Brush as a Surface Modification Layer","volume":"12","author":"Kim","year":"2020","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Zhu, C., Zhou, T., Xia, H., and Zhang, T. (2023). Flexible Room-Temperature Ammonia Gas Sensors Based on PANI-MWCNTs\/PDMS Film for Breathing Analysis and Food Safety. Nanomaterials, 13.","DOI":"10.2139\/ssrn.4343450"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"Q3020","DOI":"10.1149\/2.0041807jss","article-title":"AlGaN\/GaN Heterostructure Based Schottky Diode Sensors with ZnO Nanorods for Environmental Ammonia Monitoring Applications","volume":"7","author":"Jung","year":"2018","journal-title":"ECS J. Solid State Sci. Technol."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"2176","DOI":"10.1021\/acsnano.1c08186","article-title":"Ultrasensitive N-Channel Graphene Gas Sensors by Nondestructive Molecular Doping","volume":"16","author":"Kwon","year":"2022","journal-title":"ACS Nano"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"1580","DOI":"10.1021\/ja955193i","article-title":"Patty\u2019s Industrial Hygiene and Toxicology. Volume 3, Part B Lewis J. Cralley, Lester V. Cralley, and James S. Bus (Dow Chemical Company). John Wiley:\u2009 New York. 1995. x + 765 pp. $195.00. ISBN 0-471-53065-4","volume":"118","author":"Blair","year":"1996","journal-title":"J. Am. Chem. Soc."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"129022","DOI":"10.1016\/j.snb.2020.129022","article-title":"Effect of Er doping on flame-made SnO2 nanoparticles to ethylene oxide sensing","volume":"328","author":"Inyawilert","year":"2021","journal-title":"Sens. Actuators B Chem."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"2100529","DOI":"10.1002\/pssa.202100529","article-title":"Highly Efficient Response of Ammonia Gas Sensor Based on Surfactant-Free Sorted-Semiconducting Single-Walled Carbon Nanotubes at Room Temperature","volume":"219","author":"Abbas","year":"2022","journal-title":"Phys. Status Solidi"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"020033","DOI":"10.1063\/5.0026156","article-title":"Enhancement of gas sensor response characteristics of functionalized SWCNTs","volume":"2276","author":"Ansari","year":"2020","journal-title":"AIP Conf. Proc."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"378","DOI":"10.1016\/j.matchemphys.2019.01.061","article-title":"Enhanced ammonia sensitive properties and mechanism research of PANI modified with hydroxylated single-walled nanotubes","volume":"226","author":"Chen","year":"2019","journal-title":"Mater. Chem. Phys."},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Santra, S., Sinha, A.K., and Ray, S.K. (2018, January 28\u201331). A Flexible Room Temperature Ammonia Sensor Based on Large Area, Transparent Single Wall Carbon Nanotube Thin Film. Proceedings of the 2018 IEEE SENSORS, New Delhi, India.","DOI":"10.1109\/ICSENS.2018.8589552"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"2468","DOI":"10.1016\/j.jmrt.2022.07.159","article-title":"Low-trace monitoring of airborne sulphur dioxide employing SnO2-CNT hybrids-based energy-efficient chemiresistor","volume":"20","author":"Chaudhary","year":"2022","journal-title":"J. Mater. Res. Technol."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1002\/nano.202100145","article-title":"Sub-ppm sulfur dioxide detection using MoS2 modified multi-wall carbon nanotubes at room temperature","volume":"3","author":"Jha","year":"2022","journal-title":"Nano Sel."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1007\/s00339-021-04288-0","article-title":"A chemiresistive gas sensor for sensitive detection of SO2 employing Ni-MOF modified \u2013OH-SWNTs and \u2013OH-MWNTs","volume":"127","author":"Ingle","year":"2021","journal-title":"Appl. Phys. A"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1016\/j.apsusc.2018.05.146","article-title":"Catalytic roles of Sm2O3 dopants on ethylene oxide sensing mechanisms of flame-made SnO2 nanoparticles","volume":"454","author":"Singkammo","year":"2018","journal-title":"Appl. Surf. Sci."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"1361","DOI":"10.1021\/ja02242a004","article-title":"The Adsorption Of Gases On Plane Surfaces Of Glass, Mica And Platinum","volume":"40","author":"Langmuir","year":"1918","journal-title":"J. Am. Chem. Soc."}],"container-title":["Nanomaterials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2079-4991\/13\/15\/2199\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:21:33Z","timestamp":1760127693000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2079-4991\/13\/15\/2199"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,7,28]]},"references-count":57,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2023,8]]}},"alternative-id":["nano13152199"],"URL":"https:\/\/doi.org\/10.3390\/nano13152199","relation":{},"ISSN":["2079-4991"],"issn-type":[{"value":"2079-4991","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,7,28]]}}}