Transition metals of Pt and Pd on the surface of topological insulator Bi2Se3

Author:

Liu Lina123ORCID,Miotkowski Ireneusz1,Zemlyanov Dmitry3ORCID,Chen Yong P.1234

Affiliation:

1. Department of Physics and Astronomy, Purdue University 1 , West Lafayette, Indiana 47907, USA

2. Institute of Physics and Astronomy and Villum Center for Hybrid Quantum Materials and Devices, Aarhus University 2 , 8000 Aarhus-C, Denmark

3. Birck Nanotechnology Center, Purdue University 3 , West Lafayette, Indiana 47907, USA

4. Purdue Quantum Science and Engineering Institute and School of Electrical and Computer Engineering, Purdue University 4 , West Lafayette, Indiana 47907, USA

Abstract

Transition metal catalysts supported on topological insulators are predicted to show improved catalytic properties due to the presence of topological surface states, which may float up to the catalysts and provide robust electron transfer. However, experimental studies of surface structures and corresponding catalytic properties of transition metal/topological insulator heterostructures have not been demonstrated so far. Here, we report the structures, chemical states, and adsorption behaviors of two conventional transition metal catalysts, Pt and Pd, on the surface of Bi2Se3, a common topological insulator material. We reveal that Pt forms nanoparticles on the Bi2Se3 surface. Moreover, the interaction between Pt and surface Se is observed. Furthermore, thermal dosing of O2 onto the Pt/Bi2Se3 heterostructure leads to no oxygen adsorption. Detailed scanning tunneling microscopy study indicates that Pt transforms into PtSe2 after the thermal process, thus preventing O2 from adsorption. For another transition metal Pd, it exhibits approximate layer-island growth on Bi2Se3, and Pd–Se interaction is also observed. Our work provides significant insights into the behaviors of transition metals on top of a common topological insulator material and will assist in the future design of catalysts built with topological materials.

Funder

Basic Energy Sciences

Multidisciplinary University Research Initiative

Villum Fonden

Publisher

AIP Publishing

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