Journal
SCIENCE
Volume 349, Issue 6246, Pages 400-404Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa7952
Keywords
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Funding
- Air Force Office of Scientific Research [FA9550-12-1-0211, FA9550-15-1-0089, FA9550-14-1-0227]
- Robert A. Welch Foundation [AT-0029]
- U.S. Army [W91CRB-14-C-0019, W91CRB-13-C-0037]
- Department of Defense [W81XWH-14-1-0228]
- NIH [1R01DC011585-01]
- NSF [CMMI-1031829, CMMI-1120382, CMMI-1335204, ECCS-1307997]
- Office of Naval Research Multidisciplinary University Research Initiative [NOOD14-11-1-0691]
- Louis A. Beecherl Jr. Chair
- Priority Academic Program Development of Jiangsu Higher Education Institutions on Renewable Energy Materials Science and Engineering
- Jiangsu Key Laboratory for Photovoltaic Engineering Science
- Jiangsu Specially-Appointed Professor Program [Sujiaoshi-2012-34]
- National Natural Science Foundation of China [31200637]
- Jiangsu Basic Research Program [BK2012148]
- Science and Technology Support Program of Changzhou [CC20140016, CZ20140013]
- Chinese Ministry of Science and Technology [2013AA014201]
- State Scholarship Fund [201406290125]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior Scholarship [12264/13-0]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo-Centros de Pesquisa, Inovacao e Difusao [2013/08293-7]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1335204] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1307997] Funding Source: National Science Foundation
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Superelastic conducting fibers with improved properties and functionalities are needed for diverse applications. Here we report the fabrication of highly stretchable (up to 1320%) sheath-core conducting fibers created by wrapping carbon nanotube sheets oriented in the fiber direction on stretched rubber fiber cores. The resulting structure exhibited distinct short-and long-period sheath buckling that occurred reversibly out of phase in the axial and belt directions, enabling a resistance change of less than 5% for a 1000% stretch. By including other rubber and carbon nanotube sheath layers, we demonstrated strain sensors generating an 860% capacitance change and electrically powered torsional muscles operating reversibly by a coupled tension-to-torsion actuation mechanism. Using theory, we quantitatively explain the complementary effects of an increase in muscle length and a large positive Poisson's ratio on torsional actuation and electronic properties.
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