{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,14]],"date-time":"2026-03-14T06:20:29Z","timestamp":1773469229754,"version":"3.50.1"},"reference-count":32,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2018,9,11]],"date-time":"2018-09-11T00:00:00Z","timestamp":1536624000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Robotics"],"abstract":"<jats:p>Demand for highly compliant mechanical sensors for use in the fields of robotics and wearable electronics has been constantly rising in recent times. Carbon based materials, and especially, carbon nanotubes, have been widely studied as a candidate piezoresistive sensing medium in these devices due to their favorable structural morphology. In this paper three different carbon based materials, namely carbon black, graphene nano-platelets, and multi-walled carbon nanotubes, were utilized as large stretch sensors capable of measuring stretches over 250%. These stretch sensors can be used in robotic hands\/arms to determine the angular position of joints. Analysis was also carried out to understand the effect of the morphologies of the carbon particles on the electromechanical response of the sensors. Sensors with gauge factors ranging from one to 1.75 for strain up to 200% were obtained. Among these sensors, the stretch sensors with carbon black\/silicone composite were found to have the highest gauge factor while demonstrating acceptable hysteresis in most robotic hand applications. The highly flexible stretch sensors demonstrated in this work show high levels of compliance and conformance making them ideal candidates as sensors for soft robotics.<\/jats:p>","DOI":"10.3390\/robotics7030054","type":"journal-article","created":{"date-parts":[[2018,9,11]],"date-time":"2018-09-11T11:40:02Z","timestamp":1536666002000},"page":"54","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":48,"title":["The Development of Highly Flexible Stretch Sensors for a Robotic Hand"],"prefix":"10.3390","volume":"7","author":[{"given":"Harish","family":"Devaraj","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, University of Auckland, Auckland 1010, New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4858-9582","authenticated-orcid":false,"given":"Tim","family":"Giffney","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, University of Auckland, Auckland 1010, New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1172-6168","authenticated-orcid":false,"given":"Adeline","family":"Petit","sequence":"additional","affiliation":[{"name":"Department of Materials Engineering, Ecole Nationale Sup\u00e9rieure d\u2019Ing\u00e9nieurs de Caen, 14000 Caen, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mahtab","family":"Assadian","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, University of Auckland, Auckland 1010, New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9308-508X","authenticated-orcid":false,"given":"Kean","family":"Aw","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, University of Auckland, Auckland 1010, New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2018,9,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"851","DOI":"10.1109\/JMEMS.2016.2587867","article-title":"Vacuum packaged low-power resonant mems strain sensor","volume":"25","author":"Do","year":"2016","journal-title":"J. Microelectromech. Syst."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Baptist, J.R., Zhang, R., Wei, D., Saadatzi, M.N., and Popa, D.O. (2017, January 22). Fabrication of strain gauge based sensors for tactile skins. Proceedings of the SPIE Commercial + Scientific Sensing and Imaging, Anaheim, CA, USA.","DOI":"10.1117\/12.2262951"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"235","DOI":"10.1109\/JSEN.2015.2479295","article-title":"A hybrid vibration powered microelectromechanical strain gauge","volume":"16","author":"Jia","year":"2016","journal-title":"IEEE Sens. J."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"44","DOI":"10.1016\/j.sna.2017.03.005","article-title":"Highly stretchable printed strain sensors using multi-walled carbon nanotube\/silicone rubber composites","volume":"259","author":"Giffney","year":"2017","journal-title":"Sens. Actuators A Phys."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"3048","DOI":"10.1038\/srep03048","article-title":"Super-stretchable, transparent carbon nanotube-based capacitive strain sensors for human motion detection","volume":"3","author":"Cai","year":"2013","journal-title":"Sci. Rep."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"2345","DOI":"10.1039\/c3nr05496a","article-title":"Wearable multifunctional sensors using printed stretchable conductors made of silver nanowires","volume":"6","author":"Yao","year":"2014","journal-title":"Nanoscale"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1678","DOI":"10.1002\/adfm.201504755","article-title":"Stretchable, skin-mountable, and wearable strain sensors and their potential applications: A review","volume":"26","author":"Amjadi","year":"2016","journal-title":"Adv. Funct. Mater."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1770","DOI":"10.1021\/acsami.6b12415","article-title":"Highly stretchable, hysteresis-free ionic liquid-based strain sensor for precise human motion monitoring","volume":"9","author":"Choi","year":"2017","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"514","DOI":"10.1016\/j.sna.2016.06.037","article-title":"Fabrication and characterisation of highly stretchable elastomeric strain sensors for prosthetic hand applications","volume":"247","author":"Yildiz","year":"2016","journal-title":"Sens. Actuators A Phys."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s10544-016-0141-4","article-title":"An ionic liquid based strain sensor for large displacement measurement","volume":"19","author":"Keulemans","year":"2017","journal-title":"Biomed. Microdevices"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"27562","DOI":"10.1021\/acsami.5b08404","article-title":"Highly stretchable and transparent microfluidic strain sensors for monitoring human body motions","volume":"7","author":"Yoon","year":"2015","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_12","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_13","doi-asserted-by":"crossref","first-page":"136","DOI":"10.1016\/j.compositesb.2014.01.048","article-title":"Effect of carbon nanotube type and functionalization on the electrical, thermal, mechanical and electromechanical properties of carbon nanotube\/styrene\u2013butadiene\u2013styrene composites for large strain sensor applications","volume":"61","author":"Costa","year":"2014","journal-title":"Compos. Part B Eng."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"5929","DOI":"10.1021\/acsnano.5b00599","article-title":"Extremely elastic wearable carbon nanotube fiber strain sensor for monitoring of human motion","volume":"9","author":"Ryu","year":"2015","journal-title":"ACS Nano"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"6252","DOI":"10.1021\/acsnano.5b01613","article-title":"Stretchable, transparent, ultrasensitive, and patchable strain sensor for human\u2013machine interfaces comprising a nanohybrid of carbon nanotubes and conductive elastomers","volume":"9","author":"Roh","year":"2015","journal-title":"ACS Nano"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"9129","DOI":"10.1021\/acsnano.6b04125","article-title":"Knitted carbon-nanotube-sheath\/spandex-core elastomeric yarns for artificial muscles and strain sensing","volume":"10","author":"Foroughi","year":"2016","journal-title":"ACS Nano"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"702","DOI":"10.1021\/ar300028m","article-title":"Understanding the toxicity of carbon nanotubes","volume":"46","author":"Liu","year":"2012","journal-title":"Acc. Chem. Res."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"2098","DOI":"10.1016\/j.addr.2013.05.011","article-title":"Genotoxicity and carcinogenicity risk of carbon nanotubes","volume":"65","author":"Toyokuni","year":"2013","journal-title":"Adv. Drug Deliv. Rev."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1186\/s12989-014-0059-z","article-title":"The carcinogenic effect of various multi-walled carbon nanotubes (mwcnts) after intraperitoneal injection in rats","volume":"11","author":"Rittinghausen","year":"2014","journal-title":"Part. Fibre Toxicol."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Kim, M.S., Kwon, D., Kim, S., Kim, K., and Park, I. (2017, January 22\u201326). Surface micro-structured, stretchable strain sensor towards biaxial sensitivity and performance enhancement. Proceedings of the 2017 IEEE 30th International Conference on Micro Electro Mechanical Systems (MEMS), Las Vegas, NV, USA.","DOI":"10.1109\/MEMSYS.2017.7863591"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"434010","DOI":"10.1088\/0957-4484\/20\/43\/434010","article-title":"Long term investigations of carbon nanotube transistors encapsulated by atomic-layer-deposited Al2O3 for sensor applications","volume":"20","author":"Helbling","year":"2009","journal-title":"Nanotechnology"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"113508","DOI":"10.1063\/1.2186396","article-title":"Microfabricated photoplastic cantilever with integrated photoplastic\/carbon based piezoresistive strain sensor","volume":"88","author":"Gammelgaard","year":"2006","journal-title":"Appl. Phys. Lett."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"3879","DOI":"10.1021\/cm0341890","article-title":"Polymer-encapsulated carbon nanotubes prepared through ultrasonically initiated in situ emulsion polymerization","volume":"15","author":"Xia","year":"2003","journal-title":"Chem. Mater."},{"key":"ref_24","unstructured":"Yamamoto, M., Witt, U., Skupin, G., Beimborn, D., and M\u00fcller, R.J. (2005). Biodegradable aliphatic-aromatic polyesters: \u201cEcoflex\u00ae\u201d. Biopolym. Online, 4."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"021008","DOI":"10.1115\/1.4029474","article-title":"Soft tactile skin using an embedded ionic liquid and tomographic imaging","volume":"7","author":"Chossat","year":"2015","journal-title":"J. Mech. Robot."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Kurian, A.S., Giffney, T., Lee, J., Travas-Sejdic, J., and Aw, K.C. (2016, January 21\u201324). Printing of cnt\/silicone rubber for a wearable flexible stretch sensor. Proceedings of the SPIE Conference on Electroactive Polymer Actuators and Devices (EAPAD), Las Vegas, NV, USA.","DOI":"10.1117\/12.2218224"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1016\/j.physe.2013.08.010","article-title":"Characterization, charge transport and magnetic properties of multi-walled carbon nanotube\u2013polyvinyl chloride nanocomposites","volume":"56","author":"Vasanthkumar","year":"2014","journal-title":"Phys. E Low-Dimens. Syst. Nanostruct."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Mott, N. (1993). Conduction in Non-Crystalline Materials, Oxford University Press.","DOI":"10.1093\/oso\/9780198539797.001.0001"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"245602","DOI":"10.1088\/0953-8984\/24\/24\/245602","article-title":"Effect of magnetic field on mott\u2019s variable-range hopping parameters in multiwall carbon nanotube mat","volume":"24","author":"Arya","year":"2012","journal-title":"J. Phys. Condens. Matter"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1197","DOI":"10.1103\/PhysRevLett.40.1197","article-title":"Fluctuation-induced tunneling conduction in carbon-polyvinylchloride composites","volume":"40","author":"Sheng","year":"1978","journal-title":"Phys. Rev. Lett."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1016\/j.polymer.2014.12.034","article-title":"Electrical conduction and rheological behaviour of composites of poly (\u03b5-caprolactone) and mwcnts","volume":"58","author":"Chin","year":"2015","journal-title":"Polymer"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"861","DOI":"10.1088\/0953-8984\/16\/6\/015","article-title":"Field emission theory for an enhanced surface potential: A model for carbon field emitters","volume":"16","author":"Choy","year":"2004","journal-title":"J. Phys. Condens. Matter"}],"container-title":["Robotics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2218-6581\/7\/3\/54\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:19:53Z","timestamp":1760195993000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2218-6581\/7\/3\/54"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,9,11]]},"references-count":32,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2018,9]]}},"alternative-id":["robotics7030054"],"URL":"https:\/\/doi.org\/10.3390\/robotics7030054","relation":{},"ISSN":["2218-6581"],"issn-type":[{"value":"2218-6581","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,9,11]]}}}