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Solvothermal synthesis and thermoelectric properties of indium telluride nanostring-cluster hierarchical structures.

Tai G, Miao C, Wang Y, Bai Y, Zhang H, Guo W - Nanoscale Res Lett (2011)

Bottom Line: A simple solvothermal approach has been developed to successfully synthesize n-type α-In2Te3 thermoelectric nanomaterials.A diffusion-limited reaction mechanism was proposed to explain the formation of the hierarchical structures.The synthetic route can be applied to obtain other low-dimensional semiconducting telluride nanostructures.PACS: 65.80.-g, 68.35.bg, 68.35.bt.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, People's Republic of China. taiguoan@nuaa.edu.cn.

ABSTRACT
A simple solvothermal approach has been developed to successfully synthesize n-type α-In2Te3 thermoelectric nanomaterials. The nanostring-cluster hierarchical structures were prepared using In(NO3)3 and Na2TeO3 as the reactants in a mixed solvent of ethylenediamine and ethylene glycol at 200°C for 24 h. A diffusion-limited reaction mechanism was proposed to explain the formation of the hierarchical structures. The Seebeck coefficient of the bulk pellet pressed by the obtained samples exhibits 43% enhancement over that of the corresponding thin film at room temperature. The electrical conductivity of the bulk pellet is one to four orders of magnitude higher than that of the corresponding thin film or p-type bulk sample. The synthetic route can be applied to obtain other low-dimensional semiconducting telluride nanostructures.PACS: 65.80.-g, 68.35.bg, 68.35.bt.

No MeSH data available.


Related in: MedlinePlus

Thermoelectric transport properties of the In2Te3 hierarchical structures: (a) I-V characteristics obtained from the bulk pellet composed of the In2Te3 hierarchical structures;(b) The scheme of four-probe method; (c) Dependence of the Seebeck voltage as a function of temperature differences along the thermoelectric bulk pellet; (d) The set up of the measurement configuration for the Seebeck coefficient.
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Figure 1: Thermoelectric transport properties of the In2Te3 hierarchical structures: (a) I-V characteristics obtained from the bulk pellet composed of the In2Te3 hierarchical structures;(b) The scheme of four-probe method; (c) Dependence of the Seebeck voltage as a function of temperature differences along the thermoelectric bulk pellet; (d) The set up of the measurement configuration for the Seebeck coefficient.

Mentions: The obtained powders were pressed under a pressure of 58 MPa for 5 min and further pressed with a pressure of 460 MPa for 30 min at room temperature to decrease the porosity of the bulk pellet. Therefore, a rectangular bar of the powders with dimensions 15.06 mm × 5.03 mm × 1.07 mm was obtained for electrical conductivity and Seebeck coefficient measurement. A four-probe method was adopted for electrical conductivity measurement illustrated in Figure 1b. Silver pastes dropped in two ends of the thermoelectric pellet were used as electrical contacts of the electrodes to the sample. The set up of Seebeck coefficient was illustrated in Figure 1d. To decrease the effect of contact resistance on experimental results, a temperature difference of about 1 to 4 K between cool and hot ends of the bulk pellet was used for Seebeck coefficient measurement. The temperature gradient was established in the sample when the electrical power was applied by a ceramic heater. The temperature differences (ΔT) were determined by the nickel chromium-nickel silicon thermocouples. The two thermocouples were contacted with two ends of the pellet to determine the temperature change. Electrodes fixed on two ends of the thermoelectric pellet were used to monitor the Seebeck voltage drop between the two electrodes. Seebeck coefficients were determined from the slope of plots of sample voltage versus ΔT: S = -ΔV/ΔT.


Solvothermal synthesis and thermoelectric properties of indium telluride nanostring-cluster hierarchical structures.

Tai G, Miao C, Wang Y, Bai Y, Zhang H, Guo W - Nanoscale Res Lett (2011)

Thermoelectric transport properties of the In2Te3 hierarchical structures: (a) I-V characteristics obtained from the bulk pellet composed of the In2Te3 hierarchical structures;(b) The scheme of four-probe method; (c) Dependence of the Seebeck voltage as a function of temperature differences along the thermoelectric bulk pellet; (d) The set up of the measurement configuration for the Seebeck coefficient.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211416&req=5

Figure 1: Thermoelectric transport properties of the In2Te3 hierarchical structures: (a) I-V characteristics obtained from the bulk pellet composed of the In2Te3 hierarchical structures;(b) The scheme of four-probe method; (c) Dependence of the Seebeck voltage as a function of temperature differences along the thermoelectric bulk pellet; (d) The set up of the measurement configuration for the Seebeck coefficient.
Mentions: The obtained powders were pressed under a pressure of 58 MPa for 5 min and further pressed with a pressure of 460 MPa for 30 min at room temperature to decrease the porosity of the bulk pellet. Therefore, a rectangular bar of the powders with dimensions 15.06 mm × 5.03 mm × 1.07 mm was obtained for electrical conductivity and Seebeck coefficient measurement. A four-probe method was adopted for electrical conductivity measurement illustrated in Figure 1b. Silver pastes dropped in two ends of the thermoelectric pellet were used as electrical contacts of the electrodes to the sample. The set up of Seebeck coefficient was illustrated in Figure 1d. To decrease the effect of contact resistance on experimental results, a temperature difference of about 1 to 4 K between cool and hot ends of the bulk pellet was used for Seebeck coefficient measurement. The temperature gradient was established in the sample when the electrical power was applied by a ceramic heater. The temperature differences (ΔT) were determined by the nickel chromium-nickel silicon thermocouples. The two thermocouples were contacted with two ends of the pellet to determine the temperature change. Electrodes fixed on two ends of the thermoelectric pellet were used to monitor the Seebeck voltage drop between the two electrodes. Seebeck coefficients were determined from the slope of plots of sample voltage versus ΔT: S = -ΔV/ΔT.

Bottom Line: A simple solvothermal approach has been developed to successfully synthesize n-type α-In2Te3 thermoelectric nanomaterials.A diffusion-limited reaction mechanism was proposed to explain the formation of the hierarchical structures.The synthetic route can be applied to obtain other low-dimensional semiconducting telluride nanostructures.PACS: 65.80.-g, 68.35.bg, 68.35.bt.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, People's Republic of China. taiguoan@nuaa.edu.cn.

ABSTRACT
A simple solvothermal approach has been developed to successfully synthesize n-type α-In2Te3 thermoelectric nanomaterials. The nanostring-cluster hierarchical structures were prepared using In(NO3)3 and Na2TeO3 as the reactants in a mixed solvent of ethylenediamine and ethylene glycol at 200°C for 24 h. A diffusion-limited reaction mechanism was proposed to explain the formation of the hierarchical structures. The Seebeck coefficient of the bulk pellet pressed by the obtained samples exhibits 43% enhancement over that of the corresponding thin film at room temperature. The electrical conductivity of the bulk pellet is one to four orders of magnitude higher than that of the corresponding thin film or p-type bulk sample. The synthetic route can be applied to obtain other low-dimensional semiconducting telluride nanostructures.PACS: 65.80.-g, 68.35.bg, 68.35.bt.

No MeSH data available.


Related in: MedlinePlus