{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,12]],"date-time":"2026-02-12T12:34:40Z","timestamp":1770899680693,"version":"3.50.1"},"reference-count":42,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2017,3,29]],"date-time":"2017-03-29T00:00:00Z","timestamp":1490745600000},"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>A three-dimensional inverse opal (3DIO) WO3 architecture has been synthesized via a simple sacrificial template method. Morphology features of the 3DIO were characterized by scanning electron microscope (SEM) and its structure was characterized by X-ray diffraction (XRD). The shrinking ratio of the PMMA spheres was ~28.2% through measuring the distribution of the PMMA spheres and 3DIO WO3 center-to-center distance between the spheres and macropores, respectively. Beyond that, the 3DIO gas sensing properties were investigated systematically and the sensing mechanism of 3DIO WO3 was proposed. The results indicated that the response of the 3DIO sensor possessed excellent sensitivity to acetone gas, especially at trace levels. The 3DIO gas sensor response was ~7 to 5 ppm of acetone and could detect acetone low to 0.2 ppm effectively, which was in close proximity to the theoretical low detection limit of 0.14 ppm when Ra\/Rg \u2265 1.2 was used as the criterion for reliable gas sensing. All in all, the obvious satisfaction of the gas-sensing properties was ascribed to the structure of the 3DIO, and the sensor could be a promising novel device in the future.<\/jats:p>","DOI":"10.3390\/s17040710","type":"journal-article","created":{"date-parts":[[2017,3,29]],"date-time":"2017-03-29T11:26:44Z","timestamp":1490786804000},"page":"710","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Gas Sensor Based on 3-D WO3 Inverse Opal: Design and Applications"],"prefix":"10.3390","volume":"17","author":[{"given":"Ruiqing","family":"Xing","sequence":"first","affiliation":[{"name":"Tianjin Key laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin 300387, China"},{"name":"College of Electronic and Communication Engineering, Tianjin Normal University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang","family":"Du","sequence":"additional","affiliation":[{"name":"Tianjin Key laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin 300387, China"},{"name":"College of Electronic and Communication Engineering, Tianjin Normal University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaonan","family":"Zhao","sequence":"additional","affiliation":[{"name":"Tianjin Key laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin 300387, China"},{"name":"College of Electronic and Communication Engineering, Tianjin Normal University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiu","family":"Zhang","sequence":"additional","affiliation":[{"name":"Tianjin Key laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin 300387, China"},{"name":"College of Electronic and Communication Engineering, Tianjin Normal University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2017,3,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"10453","DOI":"10.1021\/acsnano.5b04680","article-title":"Self-Activated Transparent All-Graphene Gas Sensor with Endurance to Humidity and Mechanical Bending","volume":"9","author":"Kim","year":"2015","journal-title":"ACS Nano"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"580","DOI":"10.1016\/j.snb.2011.08.032","article-title":"Semiconducting metal oxides as sensors for environmentally hazardous gases","volume":"160","author":"Wetchakun","year":"2011","journal-title":"Sens. Actuators B Chem."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"7330","DOI":"10.1039\/c0cp02050h","article-title":"In situ Raman spectroscopy of H2 interaction with WO3 films","volume":"13","author":"Ou","year":"2011","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"284","DOI":"10.1016\/j.snb.2012.10.057","article-title":"Garnet-like solid state electrolyte Li6BaLa2Ta2O12 based potentiometric CO2 gas sensor","volume":"176","author":"Zhu","year":"2013","journal-title":"Sens. Actuators B Chem."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"8229","DOI":"10.1039\/c3cc44825h","article-title":"Full-color CO2 gas sensing by an inverse opal photonic hydrogel","volume":"49","author":"Hong","year":"2013","journal-title":"Chem. Commun."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"2395","DOI":"10.1002\/anie.201107681","article-title":"Ultrathin W18O49 Nanowires with Diameters below 1 nm: Synthesis, Near-Infrared Absorption, Photoluminescence, and Photochemical Reduction of Carbon Dioxide","volume":"51","author":"Xi","year":"2012","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1092","DOI":"10.1021\/ac00102a012","article-title":"Optimal coating selection for the analysis of organic vapor mixtures with polymer-coated surface acoustic wave sensor arrays","volume":"67","author":"Zellers","year":"1995","journal-title":"Anal. Chem."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"10122","DOI":"10.1038\/srep10122","article-title":"SnO2 Nanosheet\/Nanoparticle Detector for the Sensing of 1-Nonanal Gas Produced by Lung Cancer","volume":"5","author":"Masuda","year":"2015","journal-title":"Sci. Rep."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"6247","DOI":"10.1038\/srep06247","article-title":"Detection of Volatile Organic Compounds by Weight-Detectable Sensors coated with Metal-Organic Frameworks","volume":"4","author":"Yamagiwa","year":"2014","journal-title":"Sci. Rep."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"322","DOI":"10.1016\/j.snb.2009.06.021","article-title":"Real-time monitoring of sub-ppb concentrations of aromatic volatiles with a MEMS-enabled miniaturized gas-chromatograph","volume":"141","author":"Zampolli","year":"2009","journal-title":"Sens. Actuators B Chem."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1016\/j.snb.2010.09.043","article-title":"Sub-ppm H2S sensing at room temperature using CuO thin films","volume":"151","author":"Ramgir","year":"2010","journal-title":"Sens. Actuators B Chem."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"7515","DOI":"10.1038\/srep07515","article-title":"Synthesis of Au\/Graphene Oxide Composites for Selective and Sensitive Electrochemical Detection of Ascorbic Acid","volume":"4","author":"Song","year":"2014","journal-title":"Sci. Rep."},{"key":"ref_13","first-page":"8","article-title":"CuO-In2O3 Core-Shell Nanowire Based Chemical Gas Sensors","volume":"2014","author":"Li","year":"2014","journal-title":"J. Nanomater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1080\/10408430490888977","article-title":"Oxide materials for development of integrated gas sensors\u2014A comprehensive review","volume":"29","author":"Eranna","year":"2004","journal-title":"Crit. Rev. Solid State Mater. Sci."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"154","DOI":"10.1039\/C0NR00560F","article-title":"Nanosensors: Towards morphological control of gas sensing activity. SnO2, In2O3, ZnO and WO3 case studies","volume":"3","author":"Gurlo","year":"2011","journal-title":"Nanoscale"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"9416","DOI":"10.1039\/C5NR01790D","article-title":"Template-free construction of hollow alpha-Fe2O3 hexagonal nanocolumn particles with an exposed special surface for advanced gas sensing properties","volume":"7","author":"Sun","year":"2015","journal-title":"Nanoscale"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1468","DOI":"10.1002\/1521-4095(200110)13:19<1468::AID-ADMA1468>3.0.CO;2-O","article-title":"Tin dioxide opals and inverted opals: Near-ideal microstructures for gas sensors","volume":"13","author":"Scott","year":"2001","journal-title":"Adv. Mater."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"255","DOI":"10.1016\/j.snb.2015.01.086","article-title":"Three-dimensional ordered ZnO-CuO inverse opals toward low concentration acetone detection for exhaled breath sensing","volume":"211","author":"Xie","year":"2015","journal-title":"Sens. Actuators B Chem."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1016\/j.aca.2008.07.008","article-title":"Macroporous ordered titanium dioxide (TiO2) inverse opal as a new label-free immunosensor","volume":"625","author":"Li","year":"2008","journal-title":"Anal. Chim. Acta"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3372","DOI":"10.1039\/C4TA05438E","article-title":"Highly reversible switching from P- to N-type NO2 sensing in a monolayer Fe2O3 inverse opal film and the associated P-N transition phase diagram","volume":"3","author":"Dai","year":"2015","journal-title":"J. Mater. Chem. A"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"5296","DOI":"10.1021\/ja109511a","article-title":"Macroporous WO3 Thin Films Active in NH3 Sensing: Role of the Hosted Cr Isolated Centers and Pt Nanoclusters","volume":"133","author":"Armelao","year":"2011","journal-title":"J. Am. Chem. Soc."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"706","DOI":"10.1016\/j.snb.2014.12.046","article-title":"Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties","volume":"209","author":"Qin","year":"2015","journal-title":"Sens. Actuators B Chem."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"340","DOI":"10.1002\/anie.201408617","article-title":"Large-Area Alignment of Tungsten Oxide Nanowires over Flat and Patterned Substrates for Room-Temperature Gas Sensing","volume":"54","author":"Cheng","year":"2015","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"3581","DOI":"10.1021\/ac902695n","article-title":"Si:WO3 Sensors for Highly Selective Detection of Acetone for Easy Diagnosis of Diabetes by Breath Analysis","volume":"82","author":"Righettoni","year":"2010","journal-title":"Anal. Chem."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"475","DOI":"10.1016\/S0925-4005(03)00198-9","article-title":"Crystalline structure, defects and gas sensor response to NO2 and H2S of tungsten trioxide nanopowders","volume":"93","author":"Jimenez","year":"2003","journal-title":"Sens. Actuators B Chem."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1007\/s00339-006-3707-9","article-title":"Sensors for the nitrogen oxides, NO2, NO and N2O, based on In2O3 and WO3 nanowires","volume":"85","author":"Rout","year":"2006","journal-title":"Appl. Phys. A Mater. Sci. Process."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"2049","DOI":"10.1021\/jp909742d","article-title":"Au Nanoparticle Modified WO3 Nanorods with Their Enhanced Properties for Photocatalysis and Gas Sensing","volume":"114","author":"Xiang","year":"2010","journal-title":"J. Phys. Chem. C"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"5442","DOI":"10.1021\/ic049522w","article-title":"Highly sensitive WO3 hollow-sphere gas sensors","volume":"43","author":"Li","year":"2004","journal-title":"Inorg. Chem."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1016\/j.snb.2014.12.020","article-title":"Nanosheets assembled hierarchical flower-like WO3 nanostructures: Synthesis, characterization, and their gas sensing properties","volume":"210","author":"Wang","year":"2015","journal-title":"Sens. Actuators B Chem."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"235","DOI":"10.1016\/j.snb.2013.07.024","article-title":"Three-dimensional ordered SnO2 inverse opals for superior formaldehyde gas-sensing performance","volume":"188","author":"Xing","year":"2013","journal-title":"Sens. Actuators B Chem."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1016\/j.snb.2008.12.035","article-title":"Absorption spectral response of nanotextured WO3 thin films with Pt catalyst towards H2","volume":"137","author":"Yaacob","year":"2009","journal-title":"Sens. Actuators B Chem."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1016\/S0925-4005(99)00241-5","article-title":"Temperature modulation in semiconductor gas sensing","volume":"60","author":"Lee","year":"1999","journal-title":"Sens. Actuators B Chem."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"26","DOI":"10.1016\/S0925-4005(99)00162-8","article-title":"Application of semiconductor gas sensors for medical diagnostics","volume":"59","author":"Ryabtsev","year":"1999","journal-title":"Sens. Actuators B Chem."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"2357","DOI":"10.1002\/adfm.201202729","article-title":"Thin-Wall Assembled SnO2 Fibers Functionalized by Catalytic Pt Nanoparticles and their Superior Exhaled-Breath-Sensing Properties for the Diagnosis of Diabetes","volume":"23","author":"Shin","year":"2013","journal-title":"Adv. Funct. Mater."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"494","DOI":"10.1016\/j.snb.2008.11.041","article-title":"Solvothermal synthesis and gas-sensing performance of Co3O4 hollow nanospheres","volume":"136","author":"Park","year":"2009","journal-title":"Sens. Actuators B Chem."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"62862","DOI":"10.1039\/C4RA09766A","article-title":"SnO2@Co3O4 p\u2013n heterostructures fabricated by electrospinning and mechanism analysis enhanced acetone sensing","volume":"4","author":"Bai","year":"2014","journal-title":"RSC Adv."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1016\/j.vacuum.2013.02.005","article-title":"Template-free to fabricate highly sensitive and selective acetone gas sensor based on WO3 microspheres","volume":"95","author":"Zhang","year":"2013","journal-title":"Vacuum"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"13602","DOI":"10.1039\/C4TA01930J","article-title":"Exposed facets induced enhanced acetone selective sensing property of nanostructured tungsten oxide","volume":"2","author":"Jia","year":"2014","journal-title":"J. Mater. Chem. A"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"3419","DOI":"10.1039\/c0ce00139b","article-title":"Urchin-like ZnO nanorod arrays for gas sensing applications","volume":"12","author":"Barreca","year":"2010","journal-title":"CrystEngComm"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1016\/j.snb.2013.06.065","article-title":"Acetone gas sensors based on graphene-ZnFe2O4 composite prepared by solyothermal method","volume":"188","author":"Liu","year":"2013","journal-title":"Sens. Actuators B Chem."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"7994","DOI":"10.1039\/C4TA06286H","article-title":"Anodized nanoporous WO3 Schottky contact structures for hydrogen and ethanol sensing","volume":"3","author":"Zhang","year":"2015","journal-title":"J. Mater. Chem. A"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1016\/S0925-4005(01)00890-5","article-title":"Theory of gas-diffusion controlled sensitivity for thin film semiconductor gas sensor","volume":"80","author":"Sakai","year":"2001","journal-title":"Sens. Actuators B Chem."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/4\/710\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T18:31:34Z","timestamp":1760207494000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/4\/710"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,3,29]]},"references-count":42,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2017,4]]}},"alternative-id":["s17040710"],"URL":"https:\/\/doi.org\/10.3390\/s17040710","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2017,3,29]]}}}