{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T01:28:23Z","timestamp":1770514103098,"version":"3.49.0"},"reference-count":39,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2021,7,1]],"date-time":"2021-07-01T00:00:00Z","timestamp":1625097600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Institute of Information &amp; Communications Technology Planning &amp; Evaluation (IITP)","award":["No.2018-0-00756"],"award-info":[{"award-number":["No.2018-0-00756"]}]},{"name":"Ministry of Science and ICT (MSIT, Korea)","award":["CN19100US001"],"award-info":[{"award-number":["CN19100US001"]}]},{"name":"National Research Foundation of Korea(NRF) funded by the Ministry of Education","award":["2020R1A6A1A03040570"],"award-info":[{"award-number":["2020R1A6A1A03040570"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Junction networks made of longitudinally connected metal oxide nanowires (MOx NWs) have been widely utilized in resistive-type gas sensors because the potential barrier at the NW junctions leads to improved gas sensing performances. However, conventional MOx\u2013NW-based gas sensors exhibit limited gas access to the sensing sites and reduced utilization of the entire NW surfaces because the NW networks are grown on the substrate. This study presents a novel gas sensor platform facilitating the formation of ZnO NW junction networks in a suspended architecture by growing ZnO NWs radially on a suspended carbon mesh backbone consisting of sub-micrometer-sized wires. NW networks were densely formed in the lateral and longitudinal directions of the ZnO NWs, forming additional longitudinally connected junctions in the voids of the carbon mesh. Therefore, target gases could efficiently access the sensing sites, including the junctions and the entire surface of the ZnO NWs. Thus, the present sensor, based on a suspended network of longitudinally connected NW junctions, exhibited enhanced gas response, sensitivity, and lower limit of detection compared to sensors consisting of only laterally connected NWs. In addition, complete sensor structures consisting of a suspended carbon mesh backbone and ZnO NWs could be prepared using only batch fabrication processes such as carbon microelectromechanical systems and hydrothermal synthesis, allowing cost-effective sensor fabrication.<\/jats:p>","DOI":"10.3390\/s21134525","type":"journal-article","created":{"date-parts":[[2021,7,1]],"date-time":"2021-07-01T12:03:27Z","timestamp":1625141007000},"page":"4525","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Development of a Novel Gas-Sensing Platform Based on a Network of Metal Oxide Nanowire Junctions Formed on a Suspended Carbon Nanomesh Backbone"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2433-7295","authenticated-orcid":false,"given":"Taejung","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seungwook","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wootaek","family":"Cho","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yeong Min","family":"Kwon","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeong Min","family":"Baik","sequence":"additional","affiliation":[{"name":"School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5660-7093","authenticated-orcid":false,"given":"Heungjoo","family":"Shin","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Chen, J., Gu, J., Zhang, R., Mao, Y., and Tian, S. (2019). Freshness Evaluation of Three Kinds of Meats Based on the Electronic Nose. Sensors, 19.","DOI":"10.3390\/s19030605"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"10645","DOI":"10.1016\/j.ijhydene.2017.03.027","article-title":"Development of a selective hydrogen leak sensor based on chemically doped SnO2 for automotive applications","volume":"42","author":"Lavanya","year":"2017","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"697","DOI":"10.1016\/j.snb.2016.02.100","article-title":"Pt-decorated In2O3 nanoparticles and their ability as a highly sensitive (<10 ppb) acetone sensor for biomedical applications","volume":"230","author":"Karmaoui","year":"2016","journal-title":"Sens. Actuators B Chem."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1054","DOI":"10.1016\/j.snb.2016.05.114","article-title":"Graphene based sensor for environmental monitoring of NO2","volume":"236","author":"Novikov","year":"2016","journal-title":"Sens. Actuators B Chem."},{"key":"ref_5","first-page":"1","article-title":"Highly selective reduced graphene oxide (rGO) sensor based on a peptide aptamer receptor for detecting explosives","volume":"9","author":"Lee","year":"2019","journal-title":"Sci. Rep."},{"key":"ref_6","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_7","doi-asserted-by":"crossref","first-page":"282","DOI":"10.1016\/j.snb.2015.10.050","article-title":"Metal oxide catalyst assisted SnO2 thin film based SO2 gas sensor","volume":"224","author":"Tyagi","year":"2016","journal-title":"Sens. Actuators B Chem."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1016\/j.snb.2015.11.024","article-title":"Fabrication and characterization of an ultrasensitive humidity sensor based on metal oxide\/graphene hybrid nanocomposite","volume":"225","author":"Zhang","year":"2016","journal-title":"Sens. Actuators B Chem."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"656","DOI":"10.1016\/j.snb.2017.09.206","article-title":"Pt nanoparticles decorated SnO2 nanoneedles for efficient CO gas sensing applications","volume":"256","author":"Zhou","year":"2018","journal-title":"Sens. Actuators B Chem."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"458","DOI":"10.1016\/j.jcis.2018.10.010","article-title":"Ultrasensitive gas sensor based on hollow tungsten trioxide-nickel oxide (WO3-NiO) nanoflowers for fast and selective xylene detection","volume":"535","author":"Gao","year":"2019","journal-title":"J. Colloid Interf. Sci."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1016\/j.snb.2009.02.020","article-title":"Metal-oxide nanostructure and gas-sensing performance","volume":"138","author":"Wal","year":"2009","journal-title":"Sens. Actuators B Chem."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1002\/smll.200500261","article-title":"Metal and Metal Oxide Nanoparticles in Chemiresistors: Does the Nanoscale Matter?","volume":"2","author":"Franke","year":"2006","journal-title":"Small"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"15119","DOI":"10.1016\/j.ceramint.2016.06.145","article-title":"Detection of hazardous volatile organic compounds (VOCs) by metal oxide nanostructures-based gas sensors: A review","volume":"42","author":"Mirzaei","year":"2016","journal-title":"Ceram. Int."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"178","DOI":"10.1016\/j.snb.2012.10.134","article-title":"Nanowire-based gas sensors","volume":"177","author":"Chen","year":"2013","journal-title":"Sens. Actuators B Chem."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1016\/j.snb.2019.02.096","article-title":"Selective gas sensor based on one single SnO2 nanowire","volume":"288","author":"Tonezzer","year":"2019","journal-title":"Sens. Actuators B Chem."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"4430","DOI":"10.1021\/ja0299452","article-title":"Hydrothermal Synthesis of ZnO Nanorods in the Diameter Regime of 50 nm","volume":"125","author":"Liu","year":"2003","journal-title":"J. Am. Chem. Soc."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"17179","DOI":"10.1039\/c3cp52392f","article-title":"A Au-functionalized ZnO nanowire gas sensor for detection of benzene and toluene","volume":"15","author":"Wang","year":"2013","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"205","DOI":"10.1016\/0925-4005(91)80007-7","article-title":"Conductance, work function and catalytic activity of SnO2-based gas sensors","volume":"3","author":"Schierbaum","year":"1991","journal-title":"Sens. Actuators B Chem."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2088","DOI":"10.3390\/s100302088","article-title":"Metal oxide gas sensors: Sensitivity and influencing factors","volume":"10","author":"Wang","year":"2010","journal-title":"Sensors"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1919","DOI":"10.1021\/nl0489283","article-title":"Detection of NO2 down to ppb Levels Using Individual and Multiple In2O3 Nanowire Devices","volume":"4","author":"Zhang","year":"2004","journal-title":"Nano Lett."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"168","DOI":"10.1016\/j.snb.2009.02.008","article-title":"On-chip fabrication of ZnO-nanowire gas sensor with high gas sensitivity","volume":"138","author":"Ahn","year":"2009","journal-title":"Sens. Actuators B Chem."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"389","DOI":"10.1016\/j.snb.2010.06.052","article-title":"Nanojunction effects in multiple ZnO nanowire gas sensor","volume":"150","author":"Khan","year":"2010","journal-title":"Sens. Actuators B Chem."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1016\/j.snb.2017.12.167","article-title":"A highly sensitive gas-sensing platform based on a metal-oxide nanowire forest grown on a suspended carbon nanowire fabricated at a wafer level","volume":"260","author":"Lim","year":"2018","journal-title":"Sens. Actuators B Chem."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"564","DOI":"10.1016\/j.snb.2017.03.038","article-title":"Self-heating hydrogen gas sensor based on an array of single suspended carbon nanowires functionalized with palladium nanoparticles","volume":"247","author":"Seo","year":"2017","journal-title":"Sens. Actuators B Chem."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"362","DOI":"10.1016\/j.snb.2018.12.159","article-title":"Fabrication of suspended nanowires for highly sensitive gas sensing","volume":"284","author":"Baek","year":"2019","journal-title":"Sens. Actuators B Chem."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"236","DOI":"10.1016\/j.snb.2017.12.180","article-title":"Self-heating oxidized suspended Pt nanowire for high performance hydrogen sensor","volume":"260","author":"Prajapati","year":"2018","journal-title":"Sens. Actuators B Chem."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"492","DOI":"10.1186\/1556-276X-8-492","article-title":"Monolithic carbon structures including suspended single nanowires and nanomeshes as a sensor platform","volume":"8","author":"Lim","year":"2013","journal-title":"Nanoscale Res. Lett."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1727","DOI":"10.1016\/j.carbon.2010.12.058","article-title":"Fabrication and electrical conductivity of suspended carbon nanofiber arrays","volume":"49","author":"Sharma","year":"2011","journal-title":"Carbon"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"252","DOI":"10.1016\/j.carbon.2016.11.048","article-title":"Carbon TEM grids fabricated using C-MEMS as the platform for suspended carbon nanowire characterization","volume":"113","author":"Pramanick","year":"2017","journal-title":"Carbon"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"11810","DOI":"10.1039\/C6NR00114A","article-title":"Mixed-scale channel networks including Kingfisher-beak-shaped 3D microfunnels for efficient single particle entrapment","volume":"8","author":"Lee","year":"2016","journal-title":"Nanoscale"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"14421","DOI":"10.1039\/C7NR07669J","article-title":"Mixed-scale PMMA (polymethyl methacrylate) channel network-based single-particle manipulation via diffusiophoresis","volume":"10","author":"Hong","year":"2018","journal-title":"Nanoscale"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"17","DOI":"10.1016\/j.jaap.2018.02.015","article-title":"Shrinkage of SU-8 microstructures during carbonization","volume":"131","author":"Natu","year":"2018","journal-title":"J. Anal. Appl. Pyrolysis"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"218","DOI":"10.1016\/j.snb.2014.12.109","article-title":"Highly sensitive hydrogen gas sensor based on a suspended palladium\/carbon nanowire fabricated via batch microfabrication processes","volume":"210","author":"Lim","year":"2015","journal-title":"Sens. Actuators B Chem."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Schroder, D.K. (2005). Semiconductor Material and Device Characterization, Wiley.","DOI":"10.1002\/0471749095"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"128529","DOI":"10.1016\/j.snb.2020.128529","article-title":"Ce oxide nanoparticles on porous reduced graphene oxides for stable hydrogen detection in air\/HMDSO environment","volume":"321","author":"Kwon","year":"2020","journal-title":"Sens. Actuators B Chem."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"594","DOI":"10.1016\/j.snb.2012.07.118","article-title":"Design of SnO2\/ZnO hierarchical nanostructures for enhanced ethanol gas-sensing performance","volume":"174","author":"Khoang","year":"2012","journal-title":"Sens. Actuators B Chem."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"727","DOI":"10.1021\/acssensors.8b00073","article-title":"Site-Specific Growth and in Situ Integration of Different Nanowire Material Networks on a Single Chip: Toward a Nanowire-Based Electronic Nose for Gas Detection","volume":"3","author":"Hrachowina","year":"2018","journal-title":"ACS Sens."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"145204","DOI":"10.1016\/j.apsusc.2019.145204","article-title":"Controlled bridge growth of ZnO nanowires on laser-scribed graphene-based devices for NO gas detection","volume":"508","author":"Chou","year":"2020","journal-title":"Appl. Surf. Sci."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"658","DOI":"10.1016\/j.jcis.2020.08.082","article-title":"Plasmon expedited response time and enhanced response in gold nanoparticles-decorated zinc oxide nanowire-based nitrogen dioxide gas sensor at room temperature","volume":"582","author":"Kim","year":"2021","journal-title":"J. Colloid Interface Sci."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/13\/4525\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:24:41Z","timestamp":1760163881000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/13\/4525"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,7,1]]},"references-count":39,"journal-issue":{"issue":"13","published-online":{"date-parts":[[2021,7]]}},"alternative-id":["s21134525"],"URL":"https:\/\/doi.org\/10.3390\/s21134525","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,7,1]]}}}