Exfoliation and Stability Studies of Germanane and its Derivatives
OHIO STATE UNIV COLUMBUS COLUMBUS United States
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The discovery of graphene has demonstrated that stable single-layer sheets can be isolated from the bulk materials. In the previous work, we have successfully isolated single-layer hydrogen-terminated-germanium germanane, GeH sheets which have unique electronic properties distinct from the bulk materials and can be applied on several areas such as sensors and transparent conducting electrodes. In order to improve the conductivity of GeH, we have synthesized phosphorus-doped germanane P-GeH, gallium-doped germanane Ga-GeH and arsenic-doped germanane As-GeH via the topochemical deintercalation of CaGeP, GaGeGa and CaGeAs, respectively. Similar to GeH, the doped GeH can also be exfoliated into single- and few-layer sheets on SiO2Si substrates mechanically. The suggested tape for exfoliating the four materials as measurable multilayer flakes is polydimethylsiloxane PDMS and lithium phenylacetylide can remove the PDMS residues on the exfoliated flakes. All the four van der Waals materials can be oxidized in the air with different oxidizing rates but the oxidization is limited to the surface layers based on the X-ray photoelectron spectroscopy and atomic force microscopy AFM. In addition, the oxidized layers can dissolve in the HCl aqueous solution but the fresh layers are resistant to the HCl aqueous solution.
- Physical Chemistry
- Atomic and Molecular Physics and Spectroscopy