Influence of Surface Chemistry on Water Absorption in Functionalized Germanane

Thaddeus J. Asel, Warren L.B. Huey, Brenton Noesges, Egle Molotokaite, Szu Chia Chien, Yaxian Wang, Aldriel Barnum, Chris McPherson, Shishi Jiang, Seth Shields, Cosimo D'Andrea, Wolfgang Windl, Eugenio Cinquanta, Leonard J. Brillson, Joshua E. Goldberger

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The graphane analogues of group 14 are a unique family of 2D materials due to the necessity of a terminal ligand for stability. Here we highlight how changing the surface ligand can lead to nonobvious interactions with other chemical species. We show using XRD, FTIR, and TGA that GeCH3 reversibly absorbs water into the van der Waals space, whereas GeH does not intercalate water. Molecular dynamics and density functional theory simulations predict that water datively interacts with the Ge-C σ∗ pocket on the Ge framework, resulting in local structural distortions. Surprisingly, these distortions give rise to an intense above band gap luminescence state of 1.87 eV, with an average lifetime of hundreds of picoseconds. This work opens potential applications for exploiting surface functionalization chemistry of 2D materials to create membrane and separation technologies.

Original languageEnglish
Pages (from-to)1537-1544
Number of pages8
JournalChemistry of Materials
Issue number4
StatePublished - 25 Feb 2020


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