Naslov
Tailoring thermal conduction in anatase TiO2

Autori
Mettan, X. ; Jaćimović, J. ; Barišić, Osor-Slaven ; Pisoni, A. ; Batistić, Ivo ; Horváth, E. ; Brown, S. ; Rossi, L. ; Szirmai, P. ; Farkas, B. ; Berger, H. ; Forró, L.

Izvornik
COMMUNICATIONS PHYSICS (2399-3650) 2 (2019); 123, 7

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
thermal conduction, anatase, TiO2

Sažetak
Thermal conductivity (κ) plays an essential role in functional devices. It is advantageous to design materials where one can tune κ in a wide range according to its function: single-crystals and nanowires of anatase polymorph of titanium dioxide, broadly used in applications ranging from photovoltaics, reflective coatings to memristors, have been synthesized in large quantities. Here we identify a new, strong diffusion mechanism of heat by polaronic structures due to oxygen vacancies, which considerably influences both the absolute value and the temperature dependence of κ. The additional decrease of κ is achieved in anatase nanowires organized into foam, where porosity and the quasi-one-dimensional size-effect dramatically hinder the propagation of heat, resulting in an extremely low κ = 0.014 W/Km at room-temperature. Doping this anatase foam could herald promising applications, in particular in thermoelectricity.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA