Journal article
In Situ Surface-Enhanced Raman Spectroscopic Studies of Electrochemically Formed Germanene
Journal of physical chemistry. C, Vol.122(27), pp.15696-15705
07/12/2018
DOI: 10.1021/acs.jpcc.8b02510
Abstract
Germanene is a 2D allotrope of germanium atoms arranged in a honeycomb structure with Dirac fermion characteristics analogous to graphene and silicene. Formation of germanene is a recent advance, based on evaporation of Ge in an ultrahigh vacuum environment. An alternative method, developed by authors, is its electrochemical growth from aqueous solutions. Initial studies were performed on Au(111) substrates in aqueous solutions of H2GeO3 using in situ scanning tunneling microscopy, voltammetry, surface X-ray diffraction, and coulometry. These results indicated that electrochemically formed germanene domains were formed and covered the surface, although the coherence lengths were short because of the presence of domain walls composed of five- and seven-membered defect rings. The present study has made use of an operando spectroelectrochemical flow cell with a Raman microscope to follow the growth of germanene. Deposits were formed on a surface-enhanced Raman spectroscopy-active Au substrate. Initial spectra did not indicate the presence of germanene. However, repeated exposure to the 780 nm laser resulted in the development of a sharp 296 cm-1 peak from a couple layer of germanene. Laser exposure appeared to improve the crystallinity of the electrodeposited germanene, enabling reproducible spectroscopic characterization. It is proposed that the laser resulted in localized annealing and self-healing of defects in the germanene layers because of interaction with surface plasmon of the Au nanomorphology and germanene, creating larger coherent Raman active germanene domains.
Details
- Title: Subtitle
- In Situ Surface-Enhanced Raman Spectroscopic Studies of Electrochemically Formed Germanene
- Creators
- Jin Jung - University of GeorgiaNhi N Bui - University of GeorgiaSheng Shen - University of GeorgiaTheodore J Reber - University of GeorgiaJoseph M Brezner - Brezner Consulting, Brookdale, California 95007, United StatesSyed Mubeen - University of IowaJohn L Stickney - University of Georgia
- Resource Type
- Journal article
- Publication Details
- Journal of physical chemistry. C, Vol.122(27), pp.15696-15705
- DOI
- 10.1021/acs.jpcc.8b02510
- NLM abbreviation
- J Phys Chem C Nanomater Interfaces
- ISSN
- 1932-7447
- eISSN
- 1932-7455
- Publisher
- American Chemical Society
- Grant note
- DOI: 10.13039/100000078, name: Division of Materials Research, award: DMR-1410109
- Language
- English
- Date published
- 07/12/2018
- Academic Unit
- Civil and Environmental Engineering; Chemical and Biochemical Engineering
- Record Identifier
- 9984197324402771
Metrics
11 Record Views