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Nano-engineering of SWNT networks for enhanced charge transport at ultralow nanotube loading
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. (Nano-engineered Materials and Organic Electronics)
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.ORCID-id: 0000-0002-3881-6764
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
2014 (Engelska)Ingår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 26, nr 19, s. 3111-3117Artikel i tidskrift, Letter (Refereegranskat) Published
Abstract [en]

We demonstrate a simple and controllable method to form periodic arrays of highly conductive nano-engineered single wall carbon nanotube networks from solution. These networks increase the conductivity of a polymer composite by as much as eight orders of magnitude compared to a traditional random network. These nano-engineered networks are demonstrated in both polystyrene and polythiophene polymers.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, 2014. Vol. 26, nr 19, s. 3111-3117
Nyckelord [en]
carbon nanotube networks;nano-engineering;charge transport;organic electronic devices;nanoimprinting
Nationell ämneskategori
Nanoteknik
Identifikatorer
URN: urn:nbn:se:umu:diva-89132DOI: 10.1002/adma.201305843ISI: 000335869100023Scopus ID: 2-s2.0-84901056103OAI: oai:DiVA.org:umu-89132DiVA, id: diva2:718975
Tillgänglig från: 2014-05-22 Skapad: 2014-05-22 Senast uppdaterad: 2023-03-24Bibliografiskt granskad
Ingår i avhandling
1. Carbon nanotubes and graphene polymer composites for opto-electronic applications
Öppna denna publikation i ny flik eller fönster >>Carbon nanotubes and graphene polymer composites for opto-electronic applications
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Carbon nanotubes are carbon based structures with outstanding electronical and mechanical properties. They are used in a wide range of applications, usually embedded in polymer in the form of composites, in order to affect the electronic behavior of the matrix material. However, as the nanotubes properties are directly dependent on their intrinsic structure, it is necessary to select specific nanotubes depending on the application, which can be a complicated and inefficient process. This makes it attractive to be able to reduce the amount of material used in the composites.

In this thesis, focus is placed on the electrical properties of the composites. A simple patterning method is presented which allows the use of extremely low amounts of nanotubes in order to increase the electrical conductivity of diverse polymers such as polystyrene (PS) or poly(3-hexylthiophene) (P3HT). This method is called nanoimprint lithography and uses a flexible mold in order to pattern composite films, leading to the creation of conducting nanotube networks, resulting in vertically conducting samples (from the bottom of the film to the top of the imprinted patterns).

In parallel, X-ray diffraction measurements have been conducted on thin P3HT polymer films. These were prepared on either silicon substrate or on graphene, and the influence of the processing conditions as well as of the substrate on the crystallinity of the polymer have been investigated. The knowledge of the crystalline structure of P3HT is of great importance as it influences its electronic properties. Establishing a link between the processing conditions and the resulting crystallinity is therefore vital in order to be able to make opto-electronic devices such as transistor or photovoltaic cells.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå universitet, 2016. s. 57
Nyckelord
carbon nanotubes, polythiophene, electrical conductivity, crystallography, graphene, nanoimprint lithography, synchrotron diffraction
Nationell ämneskategori
Nanoteknik
Forskningsämne
fysik
Identifikatorer
urn:nbn:se:umu:diva-119779 (URN)978-91-7601-478-3 (ISBN)
Disputation
2016-06-01, KB3B1, KBC, Umeå, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2016-05-11 Skapad: 2016-04-27 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

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Barbero, DavidBoulanger, NicolasRamstedt, MadeleineYu, Junchun

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