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Title: Role of humidity in oxidation of ultrathin GaSe

Abstract

The oxidation mechanisms of exfoliated Gallium Selenide (GaSe) are strongly influenced by humidity. We have observed that the presence of water molecules leads to formation of Ga 2O 3, SeO 2, and Se via sequence of intermediate reactions which include generation of aqueous solution of selenic acid. Raman spectra of GaSe flakes undergoing oxidation in a humidity-controlled environment reveal formation of selenic acid-related species causing Raman scattering signal in the regions around 830 cm -1 and around 1230 cm -1. This observation sheds light on the path of chemical reactions, going via an intermediate stage of formation of gallium hydroxide and selenium oxide-water complexes with further decompositions of these compounds to Ga 2O 3, SeO 2, and amorphous selenium.

Authors:
 [1];  [1];  [2];  [2];  [3]; ORCiD logo [1]
  1. New Mexico Tech, Socorro, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Pajarito Powder, LLC, Albuquerque,NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1570276
Report Number(s):
SAND-2019-11745J
Journal ID: ISSN 2053-1591; 679838
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Materials Research Express (Online)
Additional Journal Information:
Journal Name: Materials Research Express (Online); Journal Volume: 6; Journal Issue: 8; Journal ID: ISSN 2053-1591
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Kowalski, Brian M., Manz, Noah, Bethke, Donald, Shaner, Eric A., Serov, Alexey, and Kalugin, Nikolai G. Role of humidity in oxidation of ultrathin GaSe. United States: N. p., 2019. Web. doi:10.1088/2053-1591/ab1dd2.
Kowalski, Brian M., Manz, Noah, Bethke, Donald, Shaner, Eric A., Serov, Alexey, & Kalugin, Nikolai G. Role of humidity in oxidation of ultrathin GaSe. United States. doi:10.1088/2053-1591/ab1dd2.
Kowalski, Brian M., Manz, Noah, Bethke, Donald, Shaner, Eric A., Serov, Alexey, and Kalugin, Nikolai G. Fri . "Role of humidity in oxidation of ultrathin GaSe". United States. doi:10.1088/2053-1591/ab1dd2.
@article{osti_1570276,
title = {Role of humidity in oxidation of ultrathin GaSe},
author = {Kowalski, Brian M. and Manz, Noah and Bethke, Donald and Shaner, Eric A. and Serov, Alexey and Kalugin, Nikolai G.},
abstractNote = {The oxidation mechanisms of exfoliated Gallium Selenide (GaSe) are strongly influenced by humidity. We have observed that the presence of water molecules leads to formation of Ga2O3, SeO2, and Se via sequence of intermediate reactions which include generation of aqueous solution of selenic acid. Raman spectra of GaSe flakes undergoing oxidation in a humidity-controlled environment reveal formation of selenic acid-related species causing Raman scattering signal in the regions around 830 cm-1 and around 1230 cm-1. This observation sheds light on the path of chemical reactions, going via an intermediate stage of formation of gallium hydroxide and selenium oxide-water complexes with further decompositions of these compounds to Ga2O3, SeO2, and amorphous selenium.},
doi = {10.1088/2053-1591/ab1dd2},
journal = {Materials Research Express (Online)},
number = 8,
volume = 6,
place = {United States},
year = {2019},
month = {5}
}

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