{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,18]],"date-time":"2026-06-18T13:03:20Z","timestamp":1781787800420,"version":"3.54.5"},"reference-count":60,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2019,2,11]],"date-time":"2019-02-11T00:00:00Z","timestamp":1549843200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>High-performance hydrogen sensors are important in many industries to effectively address safety concerns related to the production, delivering, storage and use of H2 gas. Herein, we present a highly sensitive hydrogen gas sensor based on SnO2-loaded ZnO nanofibers (NFs). The xSnO2-loaded (x = 0.05, 0.1 and 0.15) ZnO NFs were fabricated using an electrospinning technique followed by calcination at high temperature. Microscopic analyses demonstrated the formation of NFs with expected morphology and chemical composition. Hydrogen sensing studies were performed at various temperatures and the optimal working temperature was selected as 300 \u00b0C. The optimal gas sensor (0.1 SnO2 loaded ZnO NFs) not only showed a high response to 50 ppb hydrogen gas, but also showed an excellent selectivity to hydrogen gas. The excellent performance of the gas sensor to hydrogen gas was mainly related to the formation of SnO2-ZnO heterojunctions and the metallization effect of ZnO.<\/jats:p>","DOI":"10.3390\/s19030726","type":"journal-article","created":{"date-parts":[[2019,2,12]],"date-time":"2019-02-12T03:18:20Z","timestamp":1549941500000},"page":"726","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Enhanced Hydrogen Detection in ppb-Level by Electrospun SnO2-Loaded ZnO Nanofibers"],"prefix":"10.3390","volume":"19","author":[{"given":"Jae-Hyoung","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jin-Young","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jae-Hun","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sang","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2019,2,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1058","DOI":"10.1016\/j.jallcom.2017.09.124","article-title":"High performance NiO decorated graphene as a potential H2 gas sensor","volume":"729","author":"Kamal","year":"2017","journal-title":"J. Alloys Compd."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1016\/j.snb.2018.12.042","article-title":"Development of Pd-Pt functionalized high performance H2 gas sensor based on silicon carbide coated porous silicon for extreme environment applications","volume":"283","author":"Mourya","year":"2019","journal-title":"Sens. Actuators B"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"290","DOI":"10.1016\/j.snb.2011.03.065","article-title":"Selectivity towards H2 gas by flame-made Pt-loaded WO3 sensing films","volume":"157","author":"Samerjai","year":"2011","journal-title":"Sens. Actuators B"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2518","DOI":"10.1016\/j.ijhydene.2006.11.015","article-title":"Palladium dispersed multiwalled carbon nanotube based hydrogen sensor for fuel cell applications","volume":"32","author":"Kumar","year":"2007","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1016\/j.mssp.2016.11.042","article-title":"The investigation of hydrogen gas sensing properties of SAW gas sensor based on palladium surface modified SnO2 thin film","volume":"60","author":"Yang","year":"2017","journal-title":"Mater. Sci. Semicond. Process."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"393","DOI":"10.1016\/j.snb.2017.01.004","article-title":"Recent advancements in optical fiber hydrogen sensors","volume":"244","author":"Zhang","year":"2017","journal-title":"Sens. Actuators B"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"281","DOI":"10.1016\/j.carbon.2018.01.013","article-title":"Tandem gasochromic-Pd-WO3\/graphene\/Si device for room-temperature high-performance optoelectronic hydrogen sensors","volume":"130","author":"Chen","year":"2018","journal-title":"Carbon"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"313","DOI":"10.1016\/j.matlet.2004.05.092","article-title":"Enhanced hydrogen selectivity of thermoelectric gas sensor by modification of platinum catalyst surface","volume":"60","author":"Sawaguchi","year":"2006","journal-title":"Mater. Lett."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1016\/j.snb.2010.09.027","article-title":"H2 gas sensor performance of NiO at high temperatures in gas mixtures","volume":"151","author":"Steinebach","year":"2010","journal-title":"Sens. Actuators B"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"270","DOI":"10.1016\/j.snb.2017.11.066","article-title":"How shell thickness can affect the gas sensing properties of nanostructured materials: Survey of literature","volume":"258","author":"Mirzaei","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"314","DOI":"10.1016\/j.jhazmat.2018.06.015","article-title":"Resistance-based H2S gas sensors using metal oxide nanostructures: A review of recent advances","volume":"357","author":"Mirzaei","year":"2018","journal-title":"J. Hazard. Mater."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"4342","DOI":"10.1039\/C8TC00245B","article-title":"Resistive-based gas sensors for detection of benzene toluene and xylene (BTX) gases: A review","volume":"6","author":"Mirzaei","year":"2018","journal-title":"J. Mater. Chem. C"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"433","DOI":"10.1016\/j.jhazmat.2015.09.013","article-title":"Fabrication of highly sensitive and selective H2 gas sensor based on SnO2 thin film sensitized with microsized Pd islands","volume":"301","author":"Chien","year":"2016","journal-title":"J. Hazard. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1029","DOI":"10.1016\/j.ceramint.2016.10.035","article-title":"Sm-doped cobalt ferrite nanoparticles: A novel sensing material for conductometric hydrogen leak sensor","volume":"43","author":"Falsafi","year":"2017","journal-title":"Ceram. Int."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"242","DOI":"10.1016\/j.sna.2017.10.021","article-title":"Room-temperature gas sensing of ZnO-based gas sensor: A review","volume":"267","author":"Zhu","year":"2017","journal-title":"Sens. Actuators A"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"460","DOI":"10.1016\/j.snb.2018.02.025","article-title":"Amorphous Pd-assisted H2 detection of ZnO nanorod gas sensor with enhanced sensitivity and stability","volume":"262","author":"Kim","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"15213","DOI":"10.1016\/j.matpr.2018.04.085","article-title":"Low-temperature hydrothermal synthesis single-crystal ZnO nanowire for gas sensor application","volume":"5","author":"Tuscharoen","year":"2018","journal-title":"Mater. Today Proc."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1884","DOI":"10.1016\/j.snb.2017.08.210","article-title":"Sensing behavior to ppm-level gases and synergistic sensing mechanism in metal-functionalized rGO-loaded ZnO nanofibers","volume":"255","author":"Abideen","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2530","DOI":"10.1016\/j.ceramint.2018.10.184","article-title":"Synthesis of ZnO\/In2O3 composite nanofibers by co-electrospinning: A comprehensive parametric investigating the process","volume":"45","author":"Zahmatkesh","year":"2019","journal-title":"Ceram. Int."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"19998","DOI":"10.1016\/j.ceramint.2018.07.268","article-title":"Photocatalytic properties of Fe-doped ZnO electrospun nanofibers","volume":"44","author":"Liu","year":"2018","journal-title":"Ceram. Int."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"366","DOI":"10.4191\/kcers.2017.54.5.12","article-title":"Electrospun metal oxide composite nanofibers gas sensors: A review","volume":"54","author":"Abideen","year":"2017","journal-title":"J. Korean Ceram. Soc."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"190","DOI":"10.1016\/j.apsusc.2017.03.030","article-title":"TiO2\/ZnO and ZnO\/TiO2 core\/shell nanofibers prepared by electrospinning and atomic layer deposition for photocatalysis and gas sensing","volume":"424","author":"Boyadjiev","year":"2017","journal-title":"Appl. Surf. Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"698","DOI":"10.1016\/j.snb.2016.04.013","article-title":"Influence of hollowness variation on the gas-sensing properties of ZnO hollow nanofibers","volume":"232","author":"Katoch","year":"2016","journal-title":"Sens. Actuators B"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/j.apsusc.2018.03.217","article-title":"Direct growth of Al-doped ZnO ultrathin nanosheets on electrode for ethanol gas sensor application","volume":"447","author":"Cao","year":"2018","journal-title":"Appl. Surf. Sci."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"9476","DOI":"10.1016\/j.matpr.2017.06.207","article-title":"Ag doped ZnO nanowires as highly sensitive ethanol gas sensor","volume":"4","author":"Hastir","year":"2017","journal-title":"Mater. Today Proc."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1016\/j.snb.2018.08.016","article-title":"UV-illumination and Au-nanoparticles enhanced gas sensing of p-type Na-doped ZnO nanowires operating at room temperature","volume":"274","author":"Hsu","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"991","DOI":"10.1016\/j.snb.2018.05.167","article-title":"The role of Ce doping in enhancing sensing performance of ZnO-based gas sensor by adjusting the proportion of oxygen species","volume":"273","author":"Zhang","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1016\/S0925-4005(00)00335-X","article-title":"Sensing functions to NO and O2 of Nb2O5- or Ta2O5-loaded TiO2 and ZnO","volume":"69","author":"Kudo","year":"2000","journal-title":"Sens. Actuators B"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"630","DOI":"10.1016\/j.apsusc.2018.07.112","article-title":"Enhanced sensing performance and mechanism of CuO nanoparticle-loaded ZnO nanowires: Comparison with ZnO-CuO core-shell nanowires","volume":"459","author":"Diao","year":"2018","journal-title":"Appl. Surf. Sci."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"204","DOI":"10.1016\/j.snb.2017.11.063","article-title":"SnO2 (n)-NiO (p) composite nanowebs: Gas sensing properties and sensing mechanisms","volume":"258","author":"Kim","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"495","DOI":"10.1016\/j.snb.2019.01.077","article-title":"Composition-controllable p-CuO\/n-ZnO hollow nanofibers for highperformance H2S detection","volume":"285","author":"Han","year":"2019","journal-title":"Sens. Actuators B"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1007\/s00604-018-3155-1","article-title":"Light enhanced room temperature resistive NO2 sensor based on a gold-loaded organic\u2013inorganic hybrid perovskite incorporating tin dioxide","volume":"186","author":"Chen","year":"2019","journal-title":"Microchim. Acta"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1007\/s10854-018-0276-6","article-title":"ZnO doped single wall carbon nanotube as an active medium for gas sensor and solar absorber","volume":"30","author":"Kaviyarasu","year":"2019","journal-title":"J. Mater. Sci. Mater. Electron."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1801269","DOI":"10.1002\/admi.201801269","article-title":"Pore engineering of mesoporous tungsten oxides for ultrasensitive gas sensing","volume":"6","author":"Li","year":"2019","journal-title":"Adv. Mater. Interfaces"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"413","DOI":"10.1016\/j.snb.2018.08.130","article-title":"Facile synthesis of La-doped In2O3 hollow microspheres and enhanced hydrogen sulfide sensing characteristics","volume":"276","author":"Wei","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1016\/j.apsusc.2017.08.182","article-title":"Fabrication and gas sensing properties of vertically aligned Si nanowires","volume":"427","author":"Mirzaei","year":"2018","journal-title":"Appl. Surf. Sci."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"356","DOI":"10.1016\/j.snb.2018.07.158","article-title":"Selective NO2 sensor based on Bi2O3 branched SnO2 nanowires","volume":"274","author":"Bang","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Lee, J.-H., Kim, J.-Y., Mirzaei, A., Kim, H.W., and Kim, S.S. (2018). Significant enhancement of hydrogen-sensing properties of ZnO nanofibers through NiO loading. Nanomaterials, 8.","DOI":"10.20944\/preprints201808.0354.v1"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"828","DOI":"10.1016\/j.snb.2017.02.038","article-title":"Controlled synthesis of defect-rich ultrathin two-dimensional WO3 nanosheets for NO2 gas detection","volume":"245","author":"Wang","year":"2017","journal-title":"Sens. Actuators B"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"373","DOI":"10.3938\/jkps.69.373","article-title":"Fe2O3\/Co3O4 composite nanoparticle ethanol sensor","volume":"69","author":"Mirzaei","year":"2016","journal-title":"J. Korean Phys. Soc."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"170","DOI":"10.1016\/j.apsusc.2017.03.203","article-title":"Rational design of Sn\/SnO2\/porous carbon nanocomposites as anode materials for sodium-ion batteries","volume":"412","author":"Li","year":"2017","journal-title":"Appl. Surf. Sci."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1016\/j.apsusc.2015.01.139","article-title":"Surface defects control for ZnO nanorods synthesized by quenching and their anti-recombination in photocatalysis","volume":"332","author":"Fang","year":"2015","journal-title":"Appl. Surf. Sci."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1016\/j.jhazmat.2014.12.007","article-title":"Highly sensitive and selective H2 sensing by ZnO nanofibers and the underlying sensing mechanism","volume":"286","author":"Katoch","year":"2015","journal-title":"J. Hazard. Mater."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"315","DOI":"10.1016\/j.matlet.2018.09.129","article-title":"Enhancement of hydrogen sensing response of ZnO nanowires for the decoration of WO3 nanoparticles","volume":"234","author":"Park","year":"2019","journal-title":"Mater. Lett."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"3129","DOI":"10.1021\/jp411552z","article-title":"Electrospun granular hollow SnO2 nanofibers hydrogen gas sensors operating at low temperatures","volume":"118","author":"Li","year":"2014","journal-title":"J. Phys. Chem. C"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"2266","DOI":"10.1088\/0957-4484\/17\/9\/032","article-title":"Rapid synthesis of ZnO nano-rods by one-step, room-temperature, solid-state reaction and their gas-sensing properties","volume":"17","author":"Sun","year":"2006","journal-title":"Nanotechnology"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"4995","DOI":"10.1088\/0957-4484\/17\/19\/037","article-title":"Hydrothermally grown oriented ZnO nanorod arrays for gas sensing applications","volume":"17","author":"Wang","year":"2006","journal-title":"Nanotechnology"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"266","DOI":"10.1016\/j.snb.2011.07.046","article-title":"Effect of Mg doping on the hydrogen-sensing characteristics of ZnO thin films","volume":"160","author":"Liu","year":"2011","journal-title":"Sens. Actuators B"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"48","DOI":"10.1016\/j.matlet.2018.07.031","article-title":"Effect of structure morphologies on hydrogen gas sensing by ZnO nanotubes","volume":"230","author":"Choi","year":"2018","journal-title":"Mater. Lett."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"588","DOI":"10.1016\/j.snb.2017.08.106","article-title":"Efficient hydrogen sensor based on Ni-doped ZnO nanostructures by RF sputtering","volume":"255","author":"Bhati","year":"2018","journal-title":"Sens. Actuators B"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1016\/j.jallcom.2017.03.274","article-title":"Pd nanoparticles composited SnO2 microspheres as sensing materials for gas sensors with enhanced hydrogen response performances","volume":"710","author":"Li","year":"2017","journal-title":"J. Alloys Compd."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1016\/j.snb.2010.01.056","article-title":"Enhancement of hydrogen monitoring properties based on Pd\u2013SnO2 composite nanofibers","volume":"147","author":"Zhang","year":"2010","journal-title":"Sens. Actuators B"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"858","DOI":"10.1016\/j.snb.2011.08.072","article-title":"Effects of Al doping on SnO2 nanofibers in hydrogen sensor","volume":"160","author":"Xu","year":"2011","journal-title":"Sens. Actuators B"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"64582","DOI":"10.1039\/C5RA08863A","article-title":"N-type SnO2 nanosheets standing on p-type carbon nanofibers: A novel hierarchical nanostructures based hydrogen sensor","volume":"5","author":"Wang","year":"2015","journal-title":"RSC Adv."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"339","DOI":"10.1016\/j.snb.2018.11.070","article-title":"Highly efficient ethanol gas sensor based on hierarchical SnO2\/Zn2SnO4 porous spheres","volume":"282","author":"Yang","year":"2019","journal-title":"Sens. Actuators B"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"389","DOI":"10.1016\/j.snb.2013.12.093","article-title":"ZnO\u2013SnO2 based composite type gas sensor for selective hydrogen sensing","volume":"194","author":"Mondal","year":"2014","journal-title":"Sens. Actuators B"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"2486","DOI":"10.1021\/acsami.5b08416","article-title":"Grain size tuned highly H2-selective chemiresistive sensors based on ZnO\u2013SnO2 composite nanofibers","volume":"8","author":"Katoch","year":"2016","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"11351","DOI":"10.1021\/acsami.5b01817","article-title":"Bifunctional sensing mechanism of SnO2\u2013ZnO composite nanofibers for drastically enhancing the sensing behavior in H2 gas","volume":"7","author":"Katoch","year":"2015","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_59","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_60","doi-asserted-by":"crossref","first-page":"736","DOI":"10.1016\/j.snb.2016.02.134","article-title":"Facile synthesis of reduced graphene oxide\/hexagonal WO3 nanosheets composites with enhanced H2S sensing properties","volume":"230","author":"Shi","year":"2016","journal-title":"Sens. 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