{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T18:43:48Z","timestamp":1782413028386,"version":"3.54.5"},"reference-count":28,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2020,2,23]],"date-time":"2020-02-23T00:00:00Z","timestamp":1582416000000},"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>In this work, polyurethane sponge is employed as the structural substrate of the sensor. Graphene oxide (GO) and polypyrrole (PPy) are alternately coated on the sponge fiber skeleton by charge layer-by-layer assembly (LBL) to form a multilayer composite conductive layer to prepare the piezoresistive sensors. The 2D GO sheet is helpful for the formation of the GO layers, and separating the PPy layer. The prepared GO\/PPy@PU (polyurethane) conductive sponges still had high compressibility. The unique fragmental microstructure and synergistic effect made the sensor reach a high sensitivity of 0.79 kPa\u22121. The sensor could detect as low as 75 Pa, exhibited response time less than 70 ms and reproducibility over 10,000 cycles, and could be used for different types of motion detection. This work opens up new opportunities for high-performance piezoresistive sensors and other electronic devices for GO\/PPy composites.<\/jats:p>","DOI":"10.3390\/s20041219","type":"journal-article","created":{"date-parts":[[2020,2,24]],"date-time":"2020-02-24T03:33:43Z","timestamp":1582515223000},"page":"1219","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":67,"title":["A Highly Sensitive Piezoresistive Pressure Sensor Based on Graphene Oxide\/Polypyrrole@Polyurethane Sponge"],"prefix":"10.3390","volume":"20","author":[{"given":"Bing","family":"Lv","sequence":"first","affiliation":[{"name":"Roll-Forging Research Institute, College of Materials Science and Engineering, Jilin University, Changchun 130025, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xingtong","family":"Chen","sequence":"additional","affiliation":[{"name":"Roll-Forging Research Institute, College of Materials Science and Engineering, Jilin University, Changchun 130025, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0543-7848","authenticated-orcid":false,"given":"Chunguo","family":"Liu","sequence":"additional","affiliation":[{"name":"Roll-Forging Research Institute, College of Materials Science and Engineering, Jilin University, Changchun 130025, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,2,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1700136","DOI":"10.1002\/admt.201700136","article-title":"Batch fabrication of customizable silicone-textile composite capacitive strain sensors for human motion tracking","volume":"2","author":"Atalay","year":"2017","journal-title":"Adv. Mater. Technol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"324","DOI":"10.1016\/j.eml.2016.09.007","article-title":"Flexible eco-friendly and highly sensitive paper antenna based electromechanical sensor for wireless human motion detection and structural health monitoring","volume":"9","author":"Kanaparthi","year":"2016","journal-title":"Extreme Mech. Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"6680","DOI":"10.1039\/C7NR01011G","article-title":"A wearable strain sensor based on a carbonized nano-sponge\/silicone composite for human motion detection","volume":"9","author":"Yu","year":"2017","journal-title":"Nanoscale"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"19700","DOI":"10.1021\/acsami.5b05001","article-title":"Tattoo like polyaniline microparticle-doped gold nanowire patches as highly durable wearable sensors","volume":"7","author":"Gong","year":"2015","journal-title":"ACS  Appl. Mater. Interfaces"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Herbert, R., Kim, J.H., Kim, Y.S., Lee, H.M., and Yeo, W.H. (2018). Soft material-enabled, flexible hybrid electronics for medicine, healthcare, and human-machine interfaces. Materials, 11.","DOI":"10.3390\/ma11020187"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Horsley, D.A., Rozen, O., Lu, Y., Shelton, S., Guedes, A., and Przybyla, R. (2015, January 1\u20134). Piezoelectric micromachined ultrasonic transducers for human-machine interfaces and biometric sensing. Proceedings of the 2015 IEEE SENSORS, Busan, Korea.","DOI":"10.1109\/ICSENS.2015.7370564"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"21026","DOI":"10.1021\/am505908d","article-title":"Three-dimensional highly donductive graphene-silver nanowire hybrid foams for flexible and stretchable conductors","volume":"6","author":"Wu","year":"2014","journal-title":"ACS  Appl. Mater. Interfaces"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"3451","DOI":"10.1002\/adma.201305182","article-title":"Highly stretchable resistive pressure sensors using a conductive elastomeric composite on a micropyramid array","volume":"26","author":"Choong","year":"2014","journal-title":"Adv. Mater."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"6640","DOI":"10.1002\/adma.201601572","article-title":"Carbonized silk fabric for ultrastretchable, highly sensitive, and wearable strain sensors","volume":"28","author":"Wang","year":"2016","journal-title":"Adv. Mater."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"344","DOI":"10.1016\/j.compositesb.2016.12.047","article-title":"Development of water-based printable piezoresistive sensors for large strain applications","volume":"112","author":"Goncalves","year":"2017","journal-title":"Compos. Part B-Eng."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1016\/j.compscitech.2016.12.014","article-title":"The effect of filler dimensionality on the electromechanical performance of polydimethylsiloxane based conductive nanocomposites for flexible strain sensors","volume":"139","author":"Zheng","year":"2017","journal-title":"Compos. Sci. Technol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"4689","DOI":"10.1021\/nn500441k","article-title":"Giant tunneling piezoresistance of composite elastomers with interlocked microdome arrays for ultrasensitive and multimodal electronic skins","volume":"8","author":"Park","year":"2014","journal-title":"ACS  Nano"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"795","DOI":"10.1038\/nmat3380","article-title":"A flexible and highly sensitive strain-gauge sensor using reversible interlocking of nanofibres","volume":"11","author":"Pang","year":"2012","journal-title":"Nat. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"188","DOI":"10.1016\/j.sna.2016.11.031","article-title":"Multi-mode strain and curvature sensors for soft robotic applications","volume":"235","author":"White","year":"2017","journal-title":"Sens. Actuators A"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"788","DOI":"10.1038\/nnano.2011.184","article-title":"Skin-like pressure and strain sensors based on transparent elastic films of carbon nanotubes","volume":"6","author":"Lipomi","year":"2011","journal-title":"Nat. Nanotechnol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"3002","DOI":"10.1038\/ncomms4002","article-title":"An ultra-sensitive resistive pressure sensor based on hollow-sphere microstructure induced elasticity in conducting polymer film","volume":"5","author":"Pan","year":"2014","journal-title":"Nat. Commun."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"7937","DOI":"10.1021\/la050118z","article-title":"Porous tin oxide nanostructured microspheres for sensor applications","volume":"21","author":"Martinez","year":"2005","journal-title":"Langmuir"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"e1500661","DOI":"10.1126\/sciadv.1500661","article-title":"Fingertip skin-inspired microstructured ferroelectric skins discriminate static\/dynamic pressure and temperature stimuli","volume":"1","author":"Park","year":"2015","journal-title":"Sci. Adv."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2346","DOI":"10.1021\/acsnano.7b07613","article-title":"Epidermis microstructure inspired graphene pressure sensor with random distributed spinosum for high sensitivity and large linearity","volume":"12","author":"Pang","year":"2018","journal-title":"ACS  Nano"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3827","DOI":"10.1002\/smll.201601419","article-title":"High sensitivity, wearable, piezoresistive pressure sensors based on irregular microhump structures and its applications in body motion sensing","volume":"12","author":"Wang","year":"2016","journal-title":"Small"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"581","DOI":"10.1016\/j.orgel.2018.06.034","article-title":"A sandpaper-inspired flexible and stretchable resistive sensor for pressure and strain measurement","volume":"10","author":"Chhetry","year":"2018","journal-title":"Org. Electron."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"477","DOI":"10.1016\/j.snb.2017.01.202","article-title":"A highly sensitive, flexible SERS sensor for malachite green detection based on Ag decorated microstructured PDMS substrate fabricated from Taro leaf as template","volume":"246","author":"Kumar","year":"2017","journal-title":"Sens. Actuators B"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"1886","DOI":"10.1002\/smll.201403036","article-title":"Mimosa-inspired design of a flexible pressure sensor with touch sensitivity","volume":"11","author":"Su","year":"2015","journal-title":"Small"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Jian, M., Xia, K., Wang, Q., Yin, Z., Wang, H., Wang, C., Xie, H., Zhang, M., and Zhang, Y. (2017). Flexible and highly sensitive pressure sensors based on bionic hierarchical structures. Adv. Funct. Mater., 27.","DOI":"10.1002\/adfm.201606066"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1336","DOI":"10.1002\/adma.201304248","article-title":"Silk-molded flexible, ultrasensitive, and highly stable electronic skin for monitoring human physiological signals","volume":"26","author":"Wang","year":"2014","journal-title":"Adv. Mater."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"6246","DOI":"10.1002\/adfm.201601995","article-title":"Large-area compliant, low-cost, and versatile pressure-sensing platform based on microcrack-designed Carbon Black@Polyurethane sponge for human-machine interfacing","volume":"26","author":"Wu","year":"2016","journal-title":"Adv. Funct. Mater."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1002\/pen.760310212","article-title":"Models for the compressibility of layered polymeric sponges","volume":"31","author":"Swyngedau","year":"1991","journal-title":"Polym. Eng. Sci."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"369","DOI":"10.1016\/S0734-743X(97)00087-0","article-title":"Constitutive modeling of polymeric foam material subjected to dynamic crash loading","volume":"21","author":"Zhang","year":"1998","journal-title":"Int. J. Impact Eng."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/4\/1219\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:01:04Z","timestamp":1760173264000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/4\/1219"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,2,23]]},"references-count":28,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2020,2]]}},"alternative-id":["s20041219"],"URL":"https:\/\/doi.org\/10.3390\/s20041219","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,2,23]]}}}