Conducting Foams and Fibres for Bulk Plastic Thermoelectrics
Doctoral thesis, 2018
This thesis discusses thermoelectrics in the context of organics, specifically the development of materials with bulk architectures, where conjugated polymers have been used to attain functioning conducting systems. We present conducting p-type silk and n-type polyester based yarns which could ultimately prove useful for drawing upon waste heat energy from the human body, for example in the form of clothing. Additionally, foams have been developed which offer low thermal conductivities, ease of doping and comparable thermoelectric performances c.f thick films considering the amount of material present. We have also demonstrated a nanocomposite system which can be switched from p-type to n-type when irradiated with UV light, which lends itself as an ink that allows for patterning during printing.
Textile devices have been fabricated based upon p-type silk yarn dyed with PEDOT:PSS, which were further enhanced with n-type polyester yarn coated with a carbon nanotube composite, to produce an all-organic device which produces promising results in terms of thermoelectric output, offering an exciting direction for the growing field of organic thermoelectrics.
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology
Bulk Doping of Millimeter-Thick Conjugated Polymer Foams for Plastic Thermoelectrics
Advanced Functional Materials,; Vol. 27(2017)
Photoinduced p- to n-type Switching in Thermoelectric Polymer-Carbon Nanotube Composites
Advanced Materials,; Vol. 28(2016)p. 2782-2789
Machine-Washable PEDOT:PSS Dyed Silk Yarns for Electronic Textiles
ACS Applied Materials & Interfaces,; Vol. 9(2017)p. 9045-9050
Ryan, J. Lund, A. Hofmann, A. Kroon, R. Saraia-Riquelme, R. Weisenberger, M. Müller, C. All-organic textile thermoelectrics with carbon nanotube coated n-type yarns
A particularly promising method to incorporate thermoelectric materials into our day-to-day lives is via integration into textiles. This thesis explores these textiles in the form of yarn, which are stitched to create devices capable of harnessing waste heat energy. These textile based energy harvesters can then supply power to devices such as ID tags and sensors, contributing towards powering the ‘internet of things’.
Aside from textiles, the fundamentals of a thermoelectric material system is explored, namely, a novel system that could lend itself towards large scale printing, to allow for folded thermoelectric harvesters to be made en-masse.
Another focus is the use of material that has been foamed (material with connected air pockets introduced, much like a kitchen sponge) to allow for efficient access to the entire material via the air pockets, so the material can be altered with chemicals that enhance the thermoelectric performance. In a non-foamed material, it is very difficult to access the whole material.
Textile, Rubber and Polymeric Materials
Other Physics Topics
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4434
Chalmers University of Technology
KA, Chemistry Building
Opponent: Martin Heeney, Imperial University, England