Significant Improvement in Electrical Conductivity and Figure of Merit of Nanoarchitectured Porous SrTiO3 by La Doping Optimization

被引：25

作者：

Ahmed, Al Jumlat ^{[1
]}

Hossain, Md Shahriar A. ^{[1
,2
,3
]}

Islam, Sheik Md Kazi Nazrul ^{[1
,4
]}

Yun, Frank ^{[1
]}

Yang, Guangsai ^{[1
]}

Hossain, Ridwone ^{[1
]}

Khan, Aslam ^{[5
]}

Na, Jongbeom ^{[2
,6
,7
]}

Eguchi, Miharu ^{[2
,6
,7
]}

Yamauchi, Yusuke ^{[2
,3
,6
,7
,8
]}

Wang, Xiaolin ^{[1
]}

机构：

[1] Univ Wollongong, Australian Inst Innovat Mat AIIM, Inst Superconducting & Elect Mat ISEM, North Wollongong, NSW 2500, Australia

[2] Univ Queensland, Australian Inst Bioengn & Nanotechnol AIBN, Brisbane, Qld 4072, Australia

[3] Univ Queensland, Fac Engn Architecture & Informat Technol EAIT, Sch Mech & Min Engn, St Lucia, Qld 4072, Australia

[4] Univ Technol Sydney, Sch Mech & Phys Sci, Sydney, NSW 2007, Australia

[5] King Saud Univ, King Abdullah Inst Nanotechnol, Riyadh 11451, Saudi Arabia

[6] Natl Inst Mat Sci NIMS, Res Ctr Funct Mat, Tsukuba, Ibaraki 3050044, Japan

[7] Natl Inst Mat Sci NIMS, Int Ctr Mat Nanoarchitecton WPI MANA, Tsukuba, Ibaraki 3050044, Japan

[8] Kyung Hee Univ, Dept Plant & Environm New Resources, Yongin 446701, Gyeonggi Do, South Korea

来源：

ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 25期

关键词：

Doping optimization; Nanoporosity; La-doped SrTiO3; Surfactant F127; Figure of merit; HIGH THERMOELECTRIC PERFORMANCE; OF-MERIT; ENHANCEMENT; CERAMICS; NB;

D O I：

10.1021/acsami.0c01869

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

SrTiO3 is a well-studied n-type metal oxide based thermoelectric (TE) material. In this work, the first-principles calculation of La-doped SrTiO3 has been performed using the density functional theory. In addition, high TE properties of bulk SrTiO3 material have been achieved by introducing nanoscale porosity and optimizing carrier concentration by La doping. The X-ray diffraction, atomic resolution scanning transmission electron microscopy imaging, and energy-dispersive X-ray spectrometry results show that La has been doped successfully into the lattice. The scanning electron microscopy images confirm that all the samples have nearly similar nanoscale porosities. The significant enhancement of electrical conductivity over the broad temperature range has been observed through optimization of La doping. Additionally, the samples possess very low thermal conductivity, which is speculated because of the nanoscale porosity of the samples. Because of this dual mechanism of doping optimization and nanoscale porosity, there is a remarkable improvement in power factor, 1 mW/m(2)K from 650 to 800 K, and figure of merit, zT of 0.26 at 850 K, of the sample, 22 at. % La-doped SrTiO3.

引用

页码：28057 / 28064

页数：8

共 48 条

[1] Enhancement of thermoelectric properties of La-doped SrTiO3 bulk by introducing nanoscale porosity [J].