High Yield, Bottom-Up/Top-Down CVD Synthesis of 2D Layered Metal Selenides—A Promising Class of Materials for Applications in Electronics and Electrochemistry

When and Where

Nov 28, 2022
4:15pm - 4:30pm

Hynes, Level 2, Room 207

Presenter

Gilbert Nessim

Co-Author(s)

Gilbert Nessim¹

Bar Ilan University¹

Abstract

Gilbert Nessim¹

Bar Ilan University¹

Since the excitement about graphene, a monolayer of graphite, with its 2010 Nobel Prize, there has been extensive research in the synthesis of other non-carbon few/mono-layers exhibiting a variety of bandgaps and semiconducting properties (e.g., n or p type). The main approaches to deposit few/monolayers on a substrate are: (a) bottom-up synthesis from precursors using chemical vapor deposition (CVD) or (b) top-down exfoliation (liquid or mechanical) of bulk layered material. Here we show a combined bottom-up and top-down approach where (a) we synthesize in one step high yields of bulk layered materials by annealing a metal in the presence of a gas precursor (sublimated selenium from selenium powder) using chemical vapor deposition (CVD) and (b) we exfoliate and deposited (dropcast or Langmuir Blodgett) few/mono-layers on a substrate from a sonicated mixture of our material in a specific solvent. It is interesting to note that, besides the structure being 2D layered, the properties of the nanomaterials synthesized slightly differ from the materials with the same stoichiometry synthesized using conventional chemical methods (e.g., solvothermal). In this talk, we will discuss the chemical synthesis, the very extensive characterizations, and the lessons we learned in making multiple metal selenides (Ag-Se, Cu-Se, W-Se, Mo-Se, etc.). We will see how we integrated these new materials into sensors, as functional coatings, and into electrochemical devices (see selected published papers below). R. Konar and G.D. Nessim* A Mini-Review Focusing on Ambient-Pressure Chemical Vapor Deposition (AP-CVD) Based Synthesis of Layered Transition Metal Selenides for Energy Storage Applications Materials Advances, Vol. 3, 4471-4488, April 2022 M. Sadipan, R. Konar, H. Sclar, J, Grinblat, M. Talianker, M. Tkachev, X. Wu, A. Kondrakov, G.D. Nessim, and D. Aurbach* Stabilizing High-Voltage Lithium-Ion Battery Cathodes Using Functional Coatings of 2D Tungsten Diselenide ACS Energy Letters, 7, 1383−1391, March 2022 A. Moumen, R. Konar, D. Zappa, E.Teblum, I.Perelshtein, R. Lavi, S. Ruthstein, G.D. Nessim*, and E. Comini* Robust Room-Temperature NO2Sensors from Exfoliated 2D Few-Layered CVD-Grown Bulk Tungsten Di-selenide (2H-WSe2) ACS Applied Materials and Interfaces, 13, 3, 4316–4329, Jan. 2021 R. Konar, S. Das, E. Teblum, A. Modak, I. Perelshtein, J.J. Richter, A. Schechter*, and G.D. Nessim* Facile and Scalable Ambient Pressure Chemical Vapor Deposition-Assisted Synthesis of Layered Silver Selenide (β-Ag2Se) on Ag foil as an Oxygen Reduction Catalyst in Alkaline Medium Electrochimica Acta, 370, 137709, Jan. 2021