Abstract
Herein, we report on a scalable synthesis of Au nanodot (Au-ND)/Bi2Te3 nanotube (BT-NT) nanocomposites by the bottom-up synthesis of hybrid raw materials and subsequent spark plasma sintering, and their thermoelectric properties were systematically compared with those of Au-doped Bi2Te3 compounds. The Au nanodots were included as seeds and co-crystallized in the crystal growth of BT-NTs, which were well-dispersed in the Bi2Te3 matrix as nanoinclusions (10-20 nm). The thermoelectric performance (ZT) of the Au-ND/BT-NT nanocomposite was found to be enhanced by ∼67%, compared to pristine Bi2Te3 due to electron energy filtering and phonon scattering effects in the presence of embedded Au-NDs. The resulting compound showed an enhanced power factor (23.0 × 10-4 W m-1 K-2 @ 440 K, 27% improvement) and a reduced lattice thermal conductivity (0.47 W m-1 K-1 @ 440 K, 22% reduction). The peak ZT value of the present compound (0.95 @ 480 K) is larger than that of n-type single crystalline Bi2(Te,Se)3, which is one of the highest among the reported values for n-type Bi2Te3-based materials synthesized using a soft chemical route.
| Original language | English |
|---|---|
| Pages (from-to) | 1313-1319 |
| Number of pages | 7 |
| Journal | Journal of Materials Chemistry C |
| Volume | 4 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2016 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Chemistry
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Enhanced thermoelectric properties of Au nanodot-included Bi2Te3 nanotube composites. / Lee, Eunsil; Ko, Jieun; Kim, Jong Young; Seo, Won Seon; Choi, Soon Mok; Lee, Kyu Hyoung; Shim, Wooyoung; Lee, Wooyoung.
In: Journal of Materials Chemistry C, Vol. 4, No. 6, 01.01.2016, p. 1313-1319.Research output: Contribution to journal › Article
TY - JOUR
T1 - Enhanced thermoelectric properties of Au nanodot-included Bi2Te3 nanotube composites
AU - Lee, Eunsil
AU - Ko, Jieun
AU - Kim, Jong Young
AU - Seo, Won Seon
AU - Choi, Soon Mok
AU - Lee, Kyu Hyoung
AU - Shim, Wooyoung
AU - Lee, Wooyoung
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Herein, we report on a scalable synthesis of Au nanodot (Au-ND)/Bi2Te3 nanotube (BT-NT) nanocomposites by the bottom-up synthesis of hybrid raw materials and subsequent spark plasma sintering, and their thermoelectric properties were systematically compared with those of Au-doped Bi2Te3 compounds. The Au nanodots were included as seeds and co-crystallized in the crystal growth of BT-NTs, which were well-dispersed in the Bi2Te3 matrix as nanoinclusions (10-20 nm). The thermoelectric performance (ZT) of the Au-ND/BT-NT nanocomposite was found to be enhanced by ∼67%, compared to pristine Bi2Te3 due to electron energy filtering and phonon scattering effects in the presence of embedded Au-NDs. The resulting compound showed an enhanced power factor (23.0 × 10-4 W m-1 K-2 @ 440 K, 27% improvement) and a reduced lattice thermal conductivity (0.47 W m-1 K-1 @ 440 K, 22% reduction). The peak ZT value of the present compound (0.95 @ 480 K) is larger than that of n-type single crystalline Bi2(Te,Se)3, which is one of the highest among the reported values for n-type Bi2Te3-based materials synthesized using a soft chemical route.
AB - Herein, we report on a scalable synthesis of Au nanodot (Au-ND)/Bi2Te3 nanotube (BT-NT) nanocomposites by the bottom-up synthesis of hybrid raw materials and subsequent spark plasma sintering, and their thermoelectric properties were systematically compared with those of Au-doped Bi2Te3 compounds. The Au nanodots were included as seeds and co-crystallized in the crystal growth of BT-NTs, which were well-dispersed in the Bi2Te3 matrix as nanoinclusions (10-20 nm). The thermoelectric performance (ZT) of the Au-ND/BT-NT nanocomposite was found to be enhanced by ∼67%, compared to pristine Bi2Te3 due to electron energy filtering and phonon scattering effects in the presence of embedded Au-NDs. The resulting compound showed an enhanced power factor (23.0 × 10-4 W m-1 K-2 @ 440 K, 27% improvement) and a reduced lattice thermal conductivity (0.47 W m-1 K-1 @ 440 K, 22% reduction). The peak ZT value of the present compound (0.95 @ 480 K) is larger than that of n-type single crystalline Bi2(Te,Se)3, which is one of the highest among the reported values for n-type Bi2Te3-based materials synthesized using a soft chemical route.
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U2 - 10.1039/c5tc03934g
DO - 10.1039/c5tc03934g
M3 - Article
AN - SCOPUS:84956961857
VL - 4
SP - 1313
EP - 1319
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
SN - 2050-7526
IS - 6
ER -