{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,15]],"date-time":"2026-05-15T23:28:47Z","timestamp":1778887727847,"version":"3.51.4"},"reference-count":33,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2018,4,26]],"date-time":"2018-04-26T00:00:00Z","timestamp":1524700800000},"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":["Grant No.51473122"],"award-info":[{"award-number":["Grant No.51473122"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["Grant No.61401417"],"award-info":[{"award-number":["Grant No.61401417"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Postdoctoral Science Foundation of China","award":["Grant No.2016M591390"],"award-info":[{"award-number":["Grant No.2016M591390"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A facile method for preparing an easy processing, repeatable and flexible pressure sensor was presented via the synthesis of modified multi-walled carbon nanotubes (m-MWNTs) and polyurethane (PU) films. The surface modification of multi-walled carbon nanotubes (MWNTs) simultaneously used a silane coupling agent (KH550) and sodium dodecyl benzene sulfonate (SDBS) to improve the dispersibility and compatibility of the MWNTs in a polymer matrix. The electrical property and piezoresistive behavior of the m-MWNT\/PU composites were compared with raw multi-walled carbon nanotube (raw MWNT)\/PU composites. Under linear uniaxial pressure, the m-MWNT\/PU composite exhibited 4.282%kPa\u22121 sensitivity within the pressure of 1 kPa. The nonlinear error, hysteresis error and repeatability error of the piezoresistivity of m-MWNT\/PU decreased 9%, 16.72% and 54.95% relative to raw MWNT\/PU respectively. Therefore, the piezoresistive response of m-MWNT\/PU had better stability than that of raw MWNT\/PU composites. The m-MWNT\/PU sensors could be utilized in wearable devices for body movement detection, monitoring of respiration and pressure detection in garments.<\/jats:p>","DOI":"10.3390\/s18051338","type":"journal-article","created":{"date-parts":[[2018,4,26]],"date-time":"2018-04-26T04:17:52Z","timestamp":1524716272000},"page":"1338","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":63,"title":["Highly Stable and Flexible Pressure Sensors with Modified Multi-Walled Carbon Nanotube\/Polymer Composites for Human Monitoring"],"prefix":"10.3390","volume":"18","author":[{"given":"Yin","family":"He","sequence":"first","affiliation":[{"name":"School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China"},{"name":"School of Fashion and Art, Tianjin Polytechnic University, Tianjin 300387, China"},{"name":"Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yue","family":"Ming","sequence":"additional","affiliation":[{"name":"School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei","family":"Li","sequence":"additional","affiliation":[{"name":"School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yafang","family":"Li","sequence":"additional","affiliation":[{"name":"School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maoqi","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jinzhong","family":"Song","sequence":"additional","affiliation":[{"name":"College of Biomedical Engineering &amp; Instrument Science, Zhejiang University, Zhejiang 310027, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaojiu","family":"Li","sequence":"additional","affiliation":[{"name":"School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China"},{"name":"School of Fashion and Art, Tianjin Polytechnic University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hao","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China"},{"name":"Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2018,4,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1039\/C4MH00147H","article-title":"Advances of flexible pressure sensors toward artificial intelligence and health care applications","volume":"2","author":"Zang","year":"2015","journal-title":"Mater. Horiz."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Tao, X.M. (2015). Flexible Actuators. Handbook of Smart Textiles, Springer.","DOI":"10.1007\/978-981-4451-45-1"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"10042","DOI":"10.3390\/s140610042","article-title":"Flexible carbon nanotube films for high performance strain sensors","volume":"14","author":"Kanoun","year":"2014","journal-title":"Sensors"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"4180","DOI":"10.1039\/C6SM00204H","article-title":"A constriction resistance model of conjugated polymer based piezoresistive sensors for electronic skin applications","volume":"12","author":"Khalili","year":"2016","journal-title":"Soft Matter"},{"key":"ref_5","first-page":"450","article-title":"Highly stretchable and sensitive piezoresistive carbon nanotube\/elastomeric triisocyanate-crosslinked polytetrahydrofuran nanocomposites","volume":"4","author":"Wang","year":"2016","journal-title":"J. Mater. Chem. C"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1020","DOI":"10.1016\/j.carbon.2015.08.103","article-title":"Highly reproducible, hysteresis-free, flexible strain sensors by inkjet printing of carbon nanotubes","volume":"95","author":"Michelis","year":"2015","journal-title":"Carbon"},{"key":"ref_7","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_8","doi-asserted-by":"crossref","first-page":"296","DOI":"10.1038\/nnano.2011.36","article-title":"A stretchable carbon nanotube strain sensor for human-motion detection","volume":"6","author":"Yamada","year":"2011","journal-title":"Nat. Nanotechnol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"6252","DOI":"10.1021\/acsnano.5b01613","article-title":"Stretchable, transparent, ultra-sensitive and patchable strain sensor for human-machine interfaces comprising a nanohybrid of carbon nanotubes and conductive elastomers","volume":"9","author":"Roh","year":"2015","journal-title":"ACS Nano"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"319","DOI":"10.1016\/j.carbon.2014.01.058","article-title":"Piezoresistive effect of a carbon nanotube silicone-matrix composite","volume":"71","author":"Wang","year":"2014","journal-title":"Carbon"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1016\/j.sna.2012.09.030","article-title":"Piezoresistive response to changes in contributive tunneling film network of carbon nanotube\/silicone rubber composite under multi-load\/unload","volume":"189","author":"Wang","year":"2013","journal-title":"Sens. Actuators A Phys."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"14766","DOI":"10.1039\/C5NR03155A","article-title":"A highly sensitive, low-cost, wearable pressure sensor based on conductive hydrogel spheres","volume":"7","author":"Tai","year":"2015","journal-title":"Nanoscale"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"051903","DOI":"10.1063\/1.4790437","article-title":"Flexible, compressible, hydrophobic, floatable, and conductive carbon nanotube-polymer sponge","volume":"102","author":"Han","year":"2013","journal-title":"Appl. Phys. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"4825","DOI":"10.1002\/adma.201401364","article-title":"Reverse-micelle-induced porous pressure-sensitive rubber for wearable human-machine interfaces","volume":"26","author":"Jung","year":"2014","journal-title":"Adv. Mater."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1016\/j.compscitech.2013.11.018","article-title":"Selective localization of multi-walled carbon nanotubes in thermoplastic elastomer blends: An effective method for tunable resistivity\u2013strain sensing behavior","volume":"92","author":"Ji","year":"2014","journal-title":"Compos. Sci. Technol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"5488","DOI":"10.1016\/j.polymer.2014.08.054","article-title":"Carbon nanotube agglomeration effect on piezoresistivity of polymer nanocomposites","volume":"55","author":"Gong","year":"2014","journal-title":"Polymer"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1866","DOI":"10.1002\/pc.22305","article-title":"Synthesis and characterization of multiwalled carbon nanotube\/polyurethane composites via surface modification multiwalled carbon nanotubes using silane coupling agent","volume":"33","author":"Zhou","year":"2012","journal-title":"Polym. Compos."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1016\/j.compositesa.2014.10.028","article-title":"Preparation, characterization and properties of polycaprolactone diol-functionalized multi-walled carbon nanotube\/thermoplastic polyurethane composite","volume":"70","author":"Jing","year":"2015","journal-title":"Compos. Part A"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1155\/2013\/327597","article-title":"Enhanced strain-dependent electrical resistance of polyurethane composites with embedded oxidized multiwalled carbon nanotube networks","volume":"43","author":"Benlikaya","year":"2013","journal-title":"J. Nanomater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"106","DOI":"10.1016\/j.carbon.2010.08.048","article-title":"Poly(3-hexylthiophene) wrapped carbon nanotube\/poly(dimethylsiloxane) composites for use in finger-sensing piezoresistive pressure sensors","volume":"49","author":"Hwang","year":"2011","journal-title":"Carbon"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2108","DOI":"10.1021\/acs.jpcc.6b11783","article-title":"Largely Enhanced Stretching Sensitivity of Polyurethane\/Carbon Nanotube Nanocomposites via Incorporation of Cellulose Nanofiber","volume":"121","author":"Xu","year":"2017","journal-title":"J. Phys. Chem. C"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"9449","DOI":"10.1039\/c0jm01827a","article-title":"Fabrication and property prediction of conductive and strain sensing TPU\/CNT nanocomposite fibres","volume":"20","author":"Bilotti","year":"2010","journal-title":"J. Mater. Chem."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Zein, A.E., Hupp\u00e9, C., and Cochrane, C. (2017). Development of a Flexible Strain Sensor Based on PEDOT:PSS for Thin Film Structures. Sensors, 17.","DOI":"10.3390\/s17061337"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Amjadi, M., and Park, I. (2015, January 18\u201322). Carbon nanotubes-ecoflex nanocomposite for strain sensing with ultra-high stretchability. Proceedings of the 28th IEEE International Conference on Micro Electro Mechanical Systems, Estoril, Portugal.","DOI":"10.1109\/MEMSYS.2015.7051065"},{"key":"ref_25","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_26","first-page":"1315","article-title":"A carbon nanotube\/polymer strain sensor with linear and anti-symmetric piezoresistivity","volume":"12","author":"Yin","year":"2011","journal-title":"J. Compos. Mater."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Khan, H., Razmjou, A., Ebrahimi Warkiani, M., Kottapalli, A., and Asadnia, M. (2018). Sensitive and Flexible Polymeric Strain Sensor for Accurate Human Motion Monitoring. Sensors, 18.","DOI":"10.3390\/s18020418"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1016\/j.apsusc.2013.04.012","article-title":"Optimizing processes of dispersant concentration and post-treatments for fabricating single-walled carbon nanotube transparent conducting films","volume":"277","author":"Gao","year":"2013","journal-title":"Appl. Surf. Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"352","DOI":"10.1016\/j.cplett.2008.04.022","article-title":"Effects of surface modification of carbon nanotubes on the microstructure and electrical properties of carbon nanotubes\/rubber nanocomposites","volume":"457","author":"Jiang","year":"2008","journal-title":"Chem. Phys. Lett."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1016\/j.carbon.2012.11.039","article-title":"Functionalization of multi-wall carbon nanotubes to reduce the coefficient of the friction and improve the wear resistance of multi-wall carbon nanotube\/epoxy composites","volume":"54","author":"Cui","year":"2013","journal-title":"Carbon"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"4136","DOI":"10.1016\/j.polymer.2014.06.024","article-title":"On the mechanism of piezoresistivity of carbon nanotube polymer composites","volume":"55","author":"Shen","year":"2014","journal-title":"Polymer"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"He, Y., Li, W., Liu, H., Lu, J.Y., Zheng, T.T., and Li, X.J. (2017). A Novel Method for Fabricating Wearable, Piezoresistive, and Pressure Sensors Based on Modified-Graphite\/Polyurethane Composite Films. Materials, 10.","DOI":"10.3390\/ma10070684"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"285502","DOI":"10.1088\/0957-4484\/25\/28\/285502","article-title":"An investigation on piezoresistive behavior of carbon nanotube\/polymer composites: II positive piezoresistive effect","volume":"25","author":"Wang","year":"2014","journal-title":"Nanotechnology"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/5\/1338\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:02:13Z","timestamp":1760194933000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/5\/1338"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,4,26]]},"references-count":33,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2018,5]]}},"alternative-id":["s18051338"],"URL":"https:\/\/doi.org\/10.3390\/s18051338","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,4,26]]}}}