Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange

Zhang J, Chernomordik BD, Crisp R, Kroupa DM, Luther JM, Miller EM, Gao J, Beard MC (2015)

Publication Status: Published

Publication Type: Journal article

Publication year: 2015

Journal

Acs Nano American Chemical Society

Publisher: AMER CHEMICAL SOC

Book Volume: 9

Pages Range: 7151-7163

Journal Issue: 7

DOI: 10.1021/acsnano.5b01859

Abstract

We developed a strategy for producing quasi-spherical nanocrystals of anisotropic heterostructures of Cd/Pb chalcogenides. The nanostructures are fabricated via a controlled cation exchange reaction where the Cd2+ cation is exchanged for the Pb2+ cation. The cation exchange reaction is thermally activated and can be controlled by adjusting the reaction temperature or time. We characterized the particles using TEM, XPS, PL, and absorption spectroscopy. With complete exchange, high quality Pb-chalcogenide quantum dots are produced. In addition to Cd2+, we also find suitable conditions for the exchange of Zn2+ cations for Pb2+ cations. The cation exchange is anisotropic starting at one edge of the nanocrystals and proceeds along the (111) direction producing a sharp interface at a (111) crystallographic plane. Instead of spherical core/shell structures, we produced and studied quasi-spherical CdS/PbS and CdSe/PbSe Janus-type heterostructures. Nontrivial PL behavior was observed from the CdS(e)/PbS(e) heterostructures as the Pb:Cd ratio is increased.

Authors with CRIS profile

Ryan Crisp Lehrstuhl für Chemistry of thin film materials

Involved external institutions

National Renewable Energy Laboratory (NREL) US United States (USA) (US) Los Alamos National Laboratory US United States (USA) (US) Huazhong University of Science & Technology CN China (CN)

How to cite

APA:

Zhang, J., Chernomordik, B.D., Crisp, R., Kroupa, D.M., Luther, J.M., Miller, E.M.,... Beard, M.C. (2015). Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange. Acs Nano, 9(7), 7151-7163. https://dx.doi.org/10.1021/acsnano.5b01859

MLA:

Zhang, Jianbing, et al. "Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange." Acs Nano 9.7 (2015): 7151-7163.

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