Thermoelectric characteristics of nanocomposites made of HgSe and Ag nanoparticles for flexible thermoelectric devices

• Published in: Nano research Vol. 10; no. 2; pp. 683 - 689
• Main Authors: Yun, Junggwon, Cho, Kyoungah, Park, Yoonbeom, Yang, Seunggen, Choi, Jinyong, Kim, Sangsig
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01-02-2017; Springer Nature B.V
• Subjects: Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Cation exchanging; Chemistry and Materials Science; Condensed Matter Physics; Devices; Diffraction; Diffraction patterns; Figure of merit; Materials Science; Maximum power; Nanocomposites; Nanoparticles; Nanostructure; Nanotechnology; Plastics; Power factor; Research Article; Silver; Substrates; Thermoelectricity; Thin films; X-ray diffraction; X-rays; flexible thermoelectric; Se; Seebeck; HgSe; nanoparticles; Ag; nanocomposite
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-016-1327-z

We synthesized thermoelectric nanocomposites by mixing HgSe nanoparticles （NPs） and Ag NPs in a solution and investigated the thermoelectric properties of the nanocomposite thin films on flexible plastic substrates. The X-ray diffraction patterns and the X-ray photoelectron spectra of the nanocomposites demonstrate that cation-exchange reactions occurred spontaneously in the mixed solution of HgSe and Ag NPs and that the HgSe NPs were completely converted to Ag2Se when the Ag NP content was 20 vol.%. The maximum power factor and the thermoelectric figure of merit were obtained as 75 pW/mK2 and 0.043 at 300 K, respectively, when the Ag NP content was 10 vol.%, which is 100 times higher than that of HgSe NP thin films. In addition, the mechanical stability of the thermoelectric nanocomposite film was confirmed through repeated bending tests.