{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,27]],"date-time":"2026-04-27T20:17:39Z","timestamp":1777321059282,"version":"3.51.4"},"reference-count":21,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2018,11,6]],"date-time":"2018-11-06T00:00:00Z","timestamp":1541462400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["11774381"],"award-info":[{"award-number":["11774381"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this contribution, a new surface acoustic wave (SAW)-based sensor was proposed for sensing hydrogen sulfide (H2S) at room temperature (30 \u00b0C), which was composed of a phase discrimination circuit, a SAW-sensing device patterned with delay line, and a triethanolamine (TEA) coating along the SAW propagation path of the sensing device. The TEA was chosen as the sensitive interface for H2S sensing, owing to the high adsorption efficiency by van der Waals\u2019 interactions and hydrogen bonds with H2S molecules at room temperature. The adsorption in TEA towards H2S modulates the SAW propagation, and the change in the corresponding phase was converted into voltage signal proportional to H2S concentration was collected as the sensor signal. A SAW delay line patterned on Y-cut quartz substrate with Al metallization was developed photographically, and lower insertion and excellent temperature stability were achieved thanks to the single-phase unidirectional transducers (SPUDTs) and lower cross-sensitivity of the piezoelectric substrate. The synthesized TEA by the reaction of ethylene oxide and ammonia was dropped into the SAW propagation path of the developed SAW device to build the H2S sensor. The developed SAW sensor was characterized by being collecting into the phase discrimination circuit. The gas experimental results appear that fast response (7 s at 4 ppm H2S), high sensitivity (0.152 mV\/ppm) and lower detection limit (0.15 ppm) were achieved at room temperature. It means the proposed SAW sensor will be promising for H2S sensing.<\/jats:p>","DOI":"10.3390\/s18113796","type":"journal-article","created":{"date-parts":[[2018,11,7]],"date-time":"2018-11-07T03:45:22Z","timestamp":1541562322000},"page":"3796","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Enhanced Sensitivity of a Hydrogen Sulfide Sensor Based on Surface Acoustic Waves at Room Temperature"],"prefix":"10.3390","volume":"18","author":[{"given":"Xueli","family":"Liu","sequence":"first","affiliation":[{"name":"Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China"},{"name":"School of Electronic, Electrical and Communication Engineering, University of 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":"Yufeng","family":"Zhang","sequence":"additional","affiliation":[{"name":"Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yong","family":"Pan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yong","family":"Liang","sequence":"additional","affiliation":[{"name":"Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junhong","family":"Li","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":[[2018,11,6]]},"reference":[{"key":"ref_1","first-page":"249","article-title":"A Comprehensive Treatise on Inorganic and Theoretical Chemistry","volume":"117","author":"Mellor","year":"2014","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1458","DOI":"10.1021\/ac50045a024","article-title":"Surface Acoustic Wave Probe for Chemical Analysis: Part I\u2014Instruction and Instrument Description, part II-Gas Chromatography Detector","volume":"51","author":"Wohltijon","year":"1979","journal-title":"Anal. Chem."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"252","DOI":"10.1016\/j.snb.2017.06.075","article-title":"ZnO\/ST-Quartz SAW resonator: An efficient NO2 sensor","volume":"252","author":"Rana","year":"2017","journal-title":"Sens. Actuators B Chem."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Marcu, A., and Viespe, C. (2017). Surface acoustic wave sensors for Hydrogen and Deuterium detection. Sensors, 17.","DOI":"10.3390\/s17061417"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1124","DOI":"10.1166\/asl.2014.5470","article-title":"Nano-crystalline SnO2 thin film based surface acoustic wave sensor for selective and fast detection of NO2 gas","volume":"20","author":"Raj","year":"2014","journal-title":"Adv. Sci. Lett."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1075","DOI":"10.1016\/j.snb.2016.12.101","article-title":"Nitric oxide sensing properties of a surface acoustic wave sensor with copper-ion-doped polyaniline\/tungsten oxide nanocomposite film","volume":"243","author":"Wang","year":"2017","journal-title":"Sens. Actuators B Chem."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Wang, W., Hu, H.L., He, S.T., Pan, Y., Zhang, C.H., and Dong, C. (2016). Development of a room temperature SAW methane gas sensor incorporating a supramolecular cryptophane. A coating. Sensors, 16.","DOI":"10.3390\/s16010073"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Wang, W., Fan, S.Y., Liang, Y., He, S.T., Pan, Y., Zhang, C.H., and Dong, C. (2018). Enhanced sensitivity of a Love wave based methane gas sensor incorporating Cryptophane\u2014A thin film. Sensors, 18.","DOI":"10.3390\/s18103247"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"17916","DOI":"10.3390\/s150817916","article-title":"Selective Surface Acoustic Wave-Based Organophosphorus Sensor Employing a Host-Guest Self-Assembly Monolayer of \u03b2-Cyclodextrin Derivative","volume":"15","author":"Pan","year":"2015","journal-title":"Sensors"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"393","DOI":"10.1016\/j.talanta.2015.10.069","article-title":"Graphene oxide as sensitive layer in Love-wave surface acoustic wave sensors for the detection of chemical warfare agent simulants","volume":"148","author":"Sayago","year":"2016","journal-title":"Talanta"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Shen, C.Y., Cheng, Y.H., and Wang, S.H. (2010, January 13\u201314). A Nitrogen Dioxide Surface Acoustic Wave Sensor Based on Polyaniline\/Tungsten Oxide Nanocomposite. Proceedings of the International Conference on Measuring Technology and Mechatronics Automation, Changsha, China.","DOI":"10.1109\/ICMTMA.2010.24"},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Wang, W., Hu, H., He, S., Pan, Y., Zhang, C., and Dong, C. (2013, January 21\u201325). A room temperature SAW based methane gas sensors. Proceedings of the IEEE International Ultrasonics Symposium, Prague, Czech.","DOI":"10.1109\/ULTSYM.2013.0549"},{"key":"ref_13","unstructured":"Nikolaou, I., Hallil, H., Deligeorgis, G., Conedera, V., Garcia, H., Dejous, C., and Rebi\u00e8re, D. (September, January 31). Novel SAW gas sensor based on grapheme. Proceedings of the Microelectronics Technology and Devices, Salvador, Brazil."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"746","DOI":"10.1016\/j.snb.2012.10.086","article-title":"A surface acoustic wave H2S gas sensor employing nanocrystalline SnO2 thin film","volume":"176","author":"Luo","year":"2013","journal-title":"Sens. Actuators B Chem."},{"key":"ref_15","unstructured":"Li, H.L., Wang, X.D., He, S.T., Fu, Q.Y., Luo, W., and Zhou, D.X. (2010). A SAW-based H2S sensor coated SnO2 thin film, in: Symposium on Piezoelectricity. Acoust. Waves Device Appl."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"119","DOI":"10.1016\/j.snb.2014.10.078","article-title":"Nanocrystalline SnO2, film prepared by the aqueous sol-gel method and its application as sensing films of the resistance and SAW H2S sensor","volume":"217","author":"Luo","year":"2015","journal-title":"Sens. Actuators B Chem."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1016\/j.snb.2012.01.002","article-title":"Development of a SnO2\/CuO-coated surface acoustic wave-based H2S sensor with switch-like response and recovery","volume":"169","author":"Wang","year":"2012","journal-title":"Sens. Actuators B Chem."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"134","DOI":"10.1016\/j.snb.2014.03.024","article-title":"Surface acoustic wave based H2S gas sensors incorporating sensitive layers of single wall carbon nanotubes decorated with Cu nanoparticles","volume":"198","author":"Asad","year":"2014","journal-title":"Sens. Actuators B Chem."},{"key":"ref_19","unstructured":"Pan, Y., Yang, L., and Liu, W.W. (2012). A kind of SAW sensor technology for the detection of H2S. Chem. Sens., 747\u2013752."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2","DOI":"10.1016\/j.sna.2006.10.018","article-title":"Optimal design on SAW sensor for wireless pressure measurement based on reflective delay line","volume":"139","author":"Wang","year":"2007","journal-title":"Sens. Actuators A Phys."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1360\/cjcp2006.19(1).47.7","article-title":"Viscoelastic Analysis of a Surface Acoustic Wave Gas Sensor Coated by a New Deposition Technique","volume":"19","author":"Wang","year":"2006","journal-title":"Chin. J. Chem. Phys."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/11\/3796\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:28:16Z","timestamp":1760196496000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/11\/3796"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,11,6]]},"references-count":21,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2018,11]]}},"alternative-id":["s18113796"],"URL":"https:\/\/doi.org\/10.3390\/s18113796","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,11,6]]}}}