Combined effect of donor doping and RGO (reduced graphene oxide) coating in La/Nb-doped SrTiO3 thermoelectrics

Tran Thi Thanh; Nguyen Van Du; Jihee Bae; Soo Yong Choi; Tauseef Ahmed; Salman Ali Khan; Jung Young Cho; Woo Hyun Nam; Duc Duy Le; Soonil Lee

doi:10.1016/j.solidstatesciences.2021.106774

Combined effect of donor doping and RGO (reduced graphene oxide) coating in La/Nb-doped SrTiO₃ thermoelectrics

Tran Thi Thanh
, Nguyen Van Du
, Jihee Bae
, Soo Yong Choi
, Tauseef Ahmed
, Salman Ali Khan
, Jung Young Cho
, Woo Hyun Nam
, Duc Duy Le
, Soonil Lee^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

SrTiO₃ (STO) is one of the most promising oxide thermoelectric (TE) materials with high thermopower, but the low electrical conductivity and high thermal conductivity are still issues to be solved. Recently, grain boundary engineering using reduced graphene oxide (RGO) has been demonstrated to have capable of simultaneously improving both the electrical and thermal properties of STO. In this study, we investigated the combined effect of La/Nb doping and RGO coating in STO to improve further the electrical conductivity and the TE efficiency of STO materials. Two series of La- and Nb-doped Sr_1-xLa_xTi_1-yNb_yO₃ (x, y = 0–0.02) samples incorporated with RGO were prepared by a combinatorial procedure of solid-state reaction, RGO coating, and the spark plasma sintering (SPS) process. The structural, morphological and temperature-dependent thermoelectric properties of the Sr_1-xLa_xTi_1-yNb_yO₃/RGO were studied and as a result, the figure of merit was enhanced ∼6.5 times by the combined effect of donor doping and lowering the double Schottky barrier height due to RGO at grain boundaries.

Original language	English
Article number	106774
Journal	Solid State Sciences
Volume	122
DOIs	https://doi.org/10.1016/j.solidstatesciences.2021.106774
State	Published - Dec 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Masson SAS

Keywords

Charge transport
Grain boundary
Graphene
SrTiO
Thermal conductivity
Thermoelectric

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

Access to Document

10.1016/j.solidstatesciences.2021.106774

Cite this

@article{0db0d92b8ae94d5193661f2b9c406f23,

title = "Combined effect of donor doping and RGO (reduced graphene oxide) coating in La/Nb-doped SrTiO3 thermoelectrics",

abstract = "SrTiO3 (STO) is one of the most promising oxide thermoelectric (TE) materials with high thermopower, but the low electrical conductivity and high thermal conductivity are still issues to be solved. Recently, grain boundary engineering using reduced graphene oxide (RGO) has been demonstrated to have capable of simultaneously improving both the electrical and thermal properties of STO. In this study, we investigated the combined effect of La/Nb doping and RGO coating in STO to improve further the electrical conductivity and the TE efficiency of STO materials. Two series of La- and Nb-doped Sr1-xLaxTi1-yNbyO3 (x, y = 0–0.02) samples incorporated with RGO were prepared by a combinatorial procedure of solid-state reaction, RGO coating, and the spark plasma sintering (SPS) process. The structural, morphological and temperature-dependent thermoelectric properties of the Sr1-xLaxTi1-yNbyO3/RGO were studied and as a result, the figure of merit was enhanced ∼6.5 times by the combined effect of donor doping and lowering the double Schottky barrier height due to RGO at grain boundaries.",

keywords = "Charge transport, Grain boundary, Graphene, SrTiO, Thermal conductivity, Thermoelectric",

author = "Thanh, \{Tran Thi\} and \{Van Du\}, Nguyen and Jihee Bae and Choi, \{Soo Yong\} and Tauseef Ahmed and Khan, \{Salman Ali\} and Cho, \{Jung Young\} and Nam, \{Woo Hyun\} and Le, \{Duc Duy\} and Soonil Lee",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Masson SAS",

year = "2021",

month = dec,

doi = "10.1016/j.solidstatesciences.2021.106774",

language = "English",

volume = "122",

journal = "Solid State Sciences",

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T1 - Combined effect of donor doping and RGO (reduced graphene oxide) coating in La/Nb-doped SrTiO3 thermoelectrics

AU - Thanh, Tran Thi

AU - Van Du, Nguyen

AU - Bae, Jihee

AU - Choi, Soo Yong

AU - Ahmed, Tauseef

AU - Khan, Salman Ali

AU - Cho, Jung Young

AU - Nam, Woo Hyun

AU - Le, Duc Duy

AU - Lee, Soonil

PY - 2021/12

Y1 - 2021/12

N2 - SrTiO3 (STO) is one of the most promising oxide thermoelectric (TE) materials with high thermopower, but the low electrical conductivity and high thermal conductivity are still issues to be solved. Recently, grain boundary engineering using reduced graphene oxide (RGO) has been demonstrated to have capable of simultaneously improving both the electrical and thermal properties of STO. In this study, we investigated the combined effect of La/Nb doping and RGO coating in STO to improve further the electrical conductivity and the TE efficiency of STO materials. Two series of La- and Nb-doped Sr1-xLaxTi1-yNbyO3 (x, y = 0–0.02) samples incorporated with RGO were prepared by a combinatorial procedure of solid-state reaction, RGO coating, and the spark plasma sintering (SPS) process. The structural, morphological and temperature-dependent thermoelectric properties of the Sr1-xLaxTi1-yNbyO3/RGO were studied and as a result, the figure of merit was enhanced ∼6.5 times by the combined effect of donor doping and lowering the double Schottky barrier height due to RGO at grain boundaries.

AB - SrTiO3 (STO) is one of the most promising oxide thermoelectric (TE) materials with high thermopower, but the low electrical conductivity and high thermal conductivity are still issues to be solved. Recently, grain boundary engineering using reduced graphene oxide (RGO) has been demonstrated to have capable of simultaneously improving both the electrical and thermal properties of STO. In this study, we investigated the combined effect of La/Nb doping and RGO coating in STO to improve further the electrical conductivity and the TE efficiency of STO materials. Two series of La- and Nb-doped Sr1-xLaxTi1-yNbyO3 (x, y = 0–0.02) samples incorporated with RGO were prepared by a combinatorial procedure of solid-state reaction, RGO coating, and the spark plasma sintering (SPS) process. The structural, morphological and temperature-dependent thermoelectric properties of the Sr1-xLaxTi1-yNbyO3/RGO were studied and as a result, the figure of merit was enhanced ∼6.5 times by the combined effect of donor doping and lowering the double Schottky barrier height due to RGO at grain boundaries.

KW - Charge transport

KW - Grain boundary

KW - Graphene

KW - SrTiO

KW - Thermal conductivity

KW - Thermoelectric

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