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Morphology, mechanical stability, and protective properties of ultrathin gallium oxide coatings

F. Lawrenz ; P. Lange ; N. Severin ; J.P. Rabe ; C.A. Helm ; Stephan Block (Institutionen för teknisk fysik, Biologisk fysik)
Langmuir (0743-7463). Vol. 31 (2015), 21, p. 5836-5842.
[Artikel, refereegranskad vetenskaplig]

Ultrathin gallium oxide layers with a thickness of 2.8 ± 0.2 nm were transferred from the surface of liquid gallium onto solid substrates, including conjugated polymer poly(3-hexylthiophene) (P3HT). The gallium oxide exhibits high mechanical stability, withstanding normal pressures of up to 1 GPa in contact mode scanning force microscopy imaging. Moreover, it lowers the rate of photodegradation of P3HT by 4 orders of magnitude, as compared to uncovered P3HT. This allows us to estimate the upper limits for oxygen and water vapor transmission rates of 0.08 cm3 m-2 day-1 and 0.06 mg m-2 day-1, respectively. Hence, similar to other highly functional coatings such as graphene, ultrathin gallium oxide layers can be regarded as promising candidates for protective layers in flexible organic (opto-)electronics and photovoltaics because they offer permeation barrier functionalities in conjunction with high optical transparency.



Denna post skapades 2015-06-23. Senast ändrad 2015-06-30.
CPL Pubid: 218740

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Biologisk fysik (2007-2015)

Ämnesområden

Biologisk fysik

Chalmers infrastruktur