期刊
ACS NANO
卷 8, 期 3, 页码 2377-2386出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn405893t
关键词
thermoelectric; carbon nanotube; flexible; sensor; n-type
类别
资金
- U.S. Air Force Office of Scientific Research [FA9550-13-1-0085]
- National Research Foundation of Korea [2011-0001645]
- Ministry of Education, Science and Technology
- US National Science Foundation [CMMI 1030958]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1030958] Funding Source: National Science Foundation
Thermoelectric energy conversion is very effective in capturing low-grade waste heat to supply electricity particularly to small devices such as sensors, wireless communication units, and wearable electronics. Conventional thermoelectric materials, however, are often inadequately brittle, expensive, toxic, and heavy. We developed both p- and n-type fabric-like flexible lightweight materials by functionalizing the large surfaces and junctions in carbon nanotube (CNT) mats. The poor thermopower and only p-type characteristics of typical CNTs have been converted into both p- and n-type with high thermopower. The changes in the electronic band diagrams of the CNTs were experimentally investigated, elucidating the carrier type and relatively large thermopower values. With our optimized device design to maximally utilize temperature gradients, an electrochromic glucose sensor was successfully operated without batteries or external power supplies, demonstrating self-powering capability. While our fundamental study provides a method of tailoring electronic transport properties, our device-level integration shows the feasibility of harvesting electrical energy by attaching the device to even curved surfaces like human bodies.
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