Role of humidity in oxidation of ultrathin GaSe

Kowalski, Brian M.; Manz, Noah; Bethke, Donald; Shaner, Eric A.; Serov, Alexey; Kalugin, Nikolai G.

doi:10.1088/2053-1591/ab1dd2

Role of humidity in oxidation of ultrathin GaSe

Journal Article · Fri May 10 00:00:00 EDT 2019 · Materials Research Express (Online)

DOI:https://doi.org/10.1088/2053-1591/ab1dd2· OSTI ID:1570276

Kowalski, Brian M. ^[1]; Manz, Noah ^[1]; Bethke, Donald ^[2]; Shaner, Eric A. ^[2]; Serov, Alexey ^[3]; ^[1]

New Mexico Tech, Socorro, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Pajarito Powder, LLC, Albuquerque,NM (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1570276

Alternate ID(s):: OSTI ID: 22966148

Report Number(s):: SAND--2019-11745J; 679838

Journal Information:: Materials Research Express (Online), Journal Name: Materials Research Express (Online) Journal Issue: 8 Vol. 6; ISSN 2053-1591

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Solution‐Processed GaSe Nanoflake‐Based Films for Photoelectrochemical Water Splitting and Photoelectrochemical‐Type Photodetectors Zappia, Marilena Isabella; Bianca, Gabriele; Bellani, Sebastiano Advanced Functional Materials, Vol. 30, Issue 10 https://doi.org/10.1002/adfm.201909572	journal	January 2020
Solution-processed GaSe nanoflake-based films for photoelectrochemical water splitting and photoelectrochemical-type photodetectors Zappia, Marilena Isabella; Bianca, Gabriele; Bellani, Sebastiano arXiv https://doi.org/10.48550/arxiv.2004.10034	text	January 2020

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