Facile Synthesis of Semiconductor-Metal Hybrid Nanoparticles with an Anisotropic Structure
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Facile Synthesis of Semiconductor-Metal Hybrid Nanoparticles with an Anisotropic Structure Akira Ohnuma1 and Kouta Iwasaki1 1 Research Laboratories, Toyota Boshoku Corporation, Kariya, Aichi 448-8651, Japan
ABSTRACT Here we report a facile and versatile procedure for the preparation of semiconductormetal hybrid nanoparticles with an anisotropic structure consisting of bismuth telluride (Bi2Te3) and gold (Au) (or silver (Ag)) nanoparticles. We simply added flake-shaped Bi2Te3 nanoparticles (Bi2Te3 nanoflakes) and trisodium citrate to an aqueous Au or Ag precursor solution heated to boiling. The edge part of the Bi2Te3 nanoflake was preferentially modified with Au or Ag nanoparticles, and the Bi2Te3-Au hybrid nanoparticles had a broad peak of light absorption around the visible region and a higher thermoelectric power factor than ordinary Bi2Te3 nanoflakes. Because of the simplicity of the procedure, the hybrid nanoparticles are expected to be used as a new class of functional materials in the large scale production.
INTRODUCTION Anisotropic nanoparticles have been fascinating objects in this decade because they can have potential applications such as for the fabrication of optical, electronic, and sensing devices through the “bottom up” approach [1-5]. Many efforts have been devoted to the synthesis of anisotropic nanoparticles, and the approaches include surface selective modification, surfacecontrolled nucleation and growth, and phase separation, etc. In spite of the success, most of these methods cannot be easily applied to large-scale production due to the multiple steps involved in a typical fabrication process. Therefore, a facile and versatile procedure is still desired for the preparation of anisotropic nanoparticles [6-8]. Recently, Jeong et al. reported a surfactant-free, quick, high-yielding, scalable synthesis to prepare Bi2Te3 nanoflakes [9]. We consider that their nanoflakes would be a reasonable substrate for an anisotropic modification due to the shape of the particles and the facileness of the method. Hybrid nanoparticles consisting of semiconductor and metal nanoparticles also attached considerable attention as the intimate combination of those components offers the original properties that are not possible from one material alone. As examples, bismuth telluride (Bi2Te3) is a representative thermoelectric semiconductor with a relatively high electrical conductivity and low thermal conductivity [10], and gold (Au), a common plasmonic metal, allows covalent attachment of thiolate ligands to the particle surface, generating a variety of unique surface functional groups for an array of purposes [11]. Although the combination of Bi2Te3 and Au nanoparticles might have a great potential for the fabrication of functional devices, it has not been fully examined yet.
Downloaded from https://www.cambridge.org/core. Access paid by the UCSB Libraries, on 06 Sep 2017 at 10:51:09, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/opl.2016.56
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