{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T10:36:53Z","timestamp":1774348613312,"version":"3.50.1"},"reference-count":26,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2011,12,20]],"date-time":"2011-12-20T00:00:00Z","timestamp":1324339200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A surface-acoustic-wave (SAW) gas sensor with a low detection limit and fast response for volatile organic compounds (VOCs) based on the condensate-adsorption effect detection is developed. In this sensor a gas chromatography (GC) column acts as the separator element and a dual-resonator oscillator acts as the detector element. Regarding the surface effective permittivity method, the response mechanism analysis, which relates the condensate-adsorption effect, is performed, leading to the sensor performance prediction prior to fabrication. New designs of SAW resonators, which act as feedback of the oscillator, are devised in order to decrease the insertion loss and to achieve single-mode control, resulting in superior frequency stability of the oscillator. Based on the new phase modulation approach, excellent short-term frequency stability (\u00b13 Hz\/s) is achieved with the SAW oscillator by using the 500 MHz dual-port resonator as feedback element. In a sensor experiment investigating formaldehyde detection, the implemented SAW gas sensor exhibits an excellent threshold detection limit as low as 0.38 pg.<\/jats:p>","DOI":"10.3390\/s111211871","type":"journal-article","created":{"date-parts":[[2011,12,20]],"date-time":"2011-12-20T16:40:37Z","timestamp":1324399237000},"page":"11871-11884","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect"],"prefix":"10.3390","volume":"11","author":[{"given":"Jiuling","family":"Liu","sequence":"first","affiliation":[{"name":"Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wen","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shunzhou","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Minghua","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shitang","family":"He","sequence":"additional","affiliation":[{"name":"Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2011,12,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Bryant, A., Lee, D.F., and Vetelino, J.F. 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B"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1016\/j.synthmet.2007.11.008","article-title":"A Polyaniline\/WO3 nanofiber composite based ZnO\/64\u00b0 YX LiNbO3 SAW hydrogen gas sensor","volume":"158","author":"Sadek","year":"2008","journal-title":"Synth. Metals"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"8705","DOI":"10.1016\/j.tsf.2007.04.009","article-title":"A ZnO nanorod based layered ZnO\/64\u00b0 YX LiNbO3 SAW hydrogen gas sensor","volume":"515","author":"Sadek","year":"2007","journal-title":"Thin Solid Films"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"168","DOI":"10.1016\/j.snb.2007.07.028","article-title":"Layered SAW gas sensor with single-walled carbon nanotube-based nanocomposite coating","volume":"127","author":"Penza","year":"2007","journal-title":"Sens. Actuat. B"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1109\/JSEN.2006.883769","article-title":"Polyaniline nanofiber based surface acoustic wave gas sensors\u2014Effect of nanofiber diameter on H2 response","volume":"7","author":"Sadek","year":"2007","journal-title":"IEEE Sens. J"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"456","DOI":"10.1016\/j.sna.2004.05.031","article-title":"Numerical calculation of SAW sensitivity: Application to ZnO\/LiTaO3 transducers","volume":"115","author":"Powell","year":"2004","journal-title":"Sens. Actuat. A"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"622","DOI":"10.1109\/JSEN.2005.850990","article-title":"Ultra-high speed chromatography and virtual chemical sensors for detecting explosives and chemical warfare agents","volume":"5","author":"Staples","year":"2005","journal-title":"IEEE Sens. J"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1002\/ep.670220320","article-title":"Development of a surface acoustic wave (SAW) analyzer for measurement of volatile organic compounds","volume":"22","author":"Watson","year":"2003","journal-title":"Environ. Progress"},{"key":"ref_12","unstructured":"Watson, G.W., and Staples, E.J. (1990, January 4\u20137). SAW resonators as vapor sensors. Honolulu, HI, USA."},{"key":"ref_13","unstructured":"Staples, E.J. (1998, January 18\u201321). Dioxin\/Furan detection and analysis using a SAW based electronic nose. Orlando, FL, USA."},{"key":"ref_14","unstructured":"Watson, G., Staples, E., and Viswanathan, S. (2003, January 22\u201326). Real time odor and VOC emission measurements associated with environmental remediation sites using a GC\/SAW. San Diego, CA, USA."},{"key":"ref_15","unstructured":"Staples, E.J. (, January May). Real time characterization of food & beverages using an electronic nose with 500 orthogonal sensors and VaporPrintTM imaging. Lake Tahoe, CA, USA."},{"key":"ref_16","unstructured":"Watson, G.W., and Staples, E.J. (2003, January 17\u201321). Real time chemical process measurements using a multi-port GC\/SAW system. San Francisco, CA, USA."},{"key":"ref_17","unstructured":"Schlichting, H. (1979). Boundary-Layer Theory, MCGRAW-HILL Book Company."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1109\/T-SU.1970.29571","article-title":"Symmetry considerations for elastic layer modes propagating in anisotropic piezoelectric crystals","volume":"17","author":"Farnell","year":"1970","journal-title":"IEEE Trans. Soni. Ultr"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Tiersten, H.F. (1969). Linear Piezoelectric Plate Vibrations, Plenum.","DOI":"10.1007\/978-1-4899-5594-4"},{"key":"ref_20","unstructured":"Auld, B.A. (1973). Acoustic Fields and Waves in Solids, John Wiley & Sons, Inc. [2nd ed]."},{"key":"ref_21","unstructured":"Batchelor, G.K. (1973). An Introduction to Fluid Dynamics, Cambridge University Press."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1109\/T-SU.1977.30925","article-title":"Analysis of generation and detection of surface and bulk acoustic waves by interdigital transducers","volume":"24","author":"Milson","year":"1977","journal-title":"IEEE Trans. Soni. Ultr"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"295","DOI":"10.1023\/A:1013644110853","article-title":"Viscoelastic properties of polymer films on surface acoustic wave organophosphorous vapor sensors","volume":"37","author":"Shen","year":"2002","journal-title":"J. Mater. Sci"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Lewis, M.F. (1974, January 29\u201331). The surface acoustic wave oscillator\u2014A natural and timely development of the quartz crystal oscillator. Atlantic, NJ, USA.","DOI":"10.1109\/FREQ.1974.200036"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Lewis, M.F. (1973, January 5\u20137). Some aspects of SAW oscillators. Monterey, CA, USA.","DOI":"10.1109\/ULTSYM.1973.196214"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"443","DOI":"10.1016\/0925-4005(93)01033-Z","article-title":"Improving the SAW gas sensor: Device, electronics, and sensor layer","volume":"18","author":"Schickfus","year":"1994","journal-title":"Sens. Actuat. B"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/11\/12\/11871\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:58:25Z","timestamp":1760219905000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/11\/12\/11871"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011,12,20]]},"references-count":26,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2011,12]]}},"alternative-id":["s111211871"],"URL":"https:\/\/doi.org\/10.3390\/s111211871","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2011,12,20]]}}}