PbS Nanosheets 2D attachement

ORAL

Abstract

Lead sulfide (PbS) is an important material for optoelectronic devices due to its small and direct energy gaps, small carrier effective masses and high charge mobilities. Making two-dimensional (2D) PbS results in novel properties which may find applications in valleytronics, low-dissipation electronics, and topological insulators. To explore these novel properties, emerging wet-chemistry syntheses have been adapted to make colloidal 2D PbS nanosheets (NSs). It provides an alternative route to the traditional epitaxial methods while making flexible, free-standing NSs. However, the growth mechanism of the PbS NSs is not well-understood yet. In our lab, a photoluminescence spectroscopy method has been developed to characterize the NSs at different growth stages. An intensity-decreasing photoluminescence peak at short wavelength was observed, together with an intensity-increasing, red-shifting peak at long wavelength. These double peaks reveal the decrease of the nanocrystals and the increase of the NSs during the reaction, where the NSs are formed through the 2D attachments of the nanocrystals, which is consistent with the measurements using transmission electron microscopy. The unique feature in the photoluminescence spectra can be used to monitor the growth of the NSs \textit{in situ. }

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Authors

  • Zhoufeng Jiang

    Bowling Green State University

  • Ghadendra Bhandari

    Bowling Green State University

  • Frazier Baker

    Youngstown State University, Kent State University, Liquid Crystal Institute, Kent State University, Department of Biological Sciences, Kent State University, Department of Physics, Department of Chemistry and Biochemistry, Kent State University, Stony Brook Univ, Ohio Univ, Institute for Advanced Simulation, Institut fur Kernphysik, and Julich Center, Bowling Green State University, Dept. of Physics, Hiram College, Ohio State Univ - Columbus, Kent State University, Psychology Dept, Cleveland State University, Physics Dept, Cleveland State University, Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, OH 44242-0001, USA, Univ of Konstanz, Univ College London, NIST, Hiroshima Univ, KIT, Missouri University of Science and Technology, University of California, San Diego, Georgia Institute of Technology, KSU, SKKU, Lock Haven Univ, Massachusetts General Hospital, University of Science and Technology of China, Yale University, Shanghai Institute of Microsystem and Information Technology, CAS, Nanjing University, Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH 44242, USA, Department of Physics, Kent State University, Kent OH 44242, Department of Electro-Optic Engineering Ilse Katz Institute for Nanoscale Science and Technology Ben Gurion University, Beer Sheva 84105, Israel, Ohio University Zanesville

  • Frazier Baker

    Youngstown State University, Kent State University, Liquid Crystal Institute, Kent State University, Department of Biological Sciences, Kent State University, Department of Physics, Department of Chemistry and Biochemistry, Kent State University, Stony Brook Univ, Ohio Univ, Institute for Advanced Simulation, Institut fur Kernphysik, and Julich Center, Bowling Green State University, Dept. of Physics, Hiram College, Ohio State Univ - Columbus, Kent State University, Psychology Dept, Cleveland State University, Physics Dept, Cleveland State University, Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, OH 44242-0001, USA, Univ of Konstanz, Univ College London, NIST, Hiroshima Univ, KIT, Missouri University of Science and Technology, University of California, San Diego, Georgia Institute of Technology, KSU, SKKU, Lock Haven Univ, Massachusetts General Hospital, University of Science and Technology of China, Yale University, Shanghai Institute of Microsystem and Information Technology, CAS, Nanjing University, Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH 44242, USA, Department of Physics, Kent State University, Kent OH 44242, Department of Electro-Optic Engineering Ilse Katz Institute for Nanoscale Science and Technology Ben Gurion University, Beer Sheva 84105, Israel, Ohio University Zanesville