Effect of Interface Control Using Multiwalled Carbon Nanotubes on the Thermoelectric Properties of TiO2 Nanocomposites
Year: 2018
Type: article
Abstract: We report the effect of interface control using multiwalled carbon nanotubes (MWCNT) on thermoelectric properties of TiO 2 .By consolidating TiO 2 nanoparticles with MWCNT (0.5, 1, 2, 4, and 8 wt%) using spark plasma sintering, we prepared interface-controlled TiO 2 -MWCNT nanocomposites, where TiO 2 grains were surrounded with a MWCNT network.Simultaneous control of charge and thermal transport was successfully achieved by interface control using MWCNTs.The electrical conductivity increased monotonically as the MWCNT content was increased.As determined in our previous report, the charge transport mechanism in the nanocomposites is based on percolation and hopping models.The formation of new interfaces at the grain boundaries using the MWCNT network led to additional phonon scattering in the nanocomposites, and the thermal conductivities decreased monotonically with increasing MWCNT content.However, the incorporation of the MWCNT did not lead to a significant increase in power factor due to a reduction in the Seebeck coefficient.Consequently, the highest ZT value of 4.6 × 10 -3 was obtained from the TiO2-0.5 wt% MWCNT nanocomposite at 1073 K. Our results introduce a strategy for the independent control of electron and phonon transport based on interface control using carbon nanomaterials in hybrid thermoelectric materials.
Source: 대한금속재료학회지
Authors: Woo Hyun Nam, Young Soo Lim
Institution: Pukyong National University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Award: G826221209
OpenAlex ID: W2869405597