Spectroscopic studies of the physical origin of environmental aging effects on doped graphene
Abstract
The environmental aging effect of doped graphene is investigated as a function of the organic doping species, humidity, and the number of graphene layers adjacent to the dopant by studies of the Raman spectroscopy, x-ray and ultraviolet photoelectron spectroscopy, scanning electron microscopy, infrared spectroscopy, and electrical transport measurements. It is found that higher humidity and structural defects induce faster degradation in doped graphene. Detailed analysis of the spectroscopic data suggest that the physical origin of the aging effect is associated with the continuing reaction of H_2O molecules with the hygroscopic organic dopants, which leads to formation of excess chemical bonds, reduction in the doped graphene carrier density, and proliferation of damages from the graphene grain boundaries. These environmental aging effects are further shown to be significantly mitigated by added graphene layers.
Additional Information
© 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Received 20 January 2016; accepted 14 May 2016; published online 15 June 2016. The work at Caltech was jointly supported by the National Science Foundation through the Institute of Quantum Information and Matter (IQIM) at Caltech, the Sobhani Foundation, and the Moore Foundation. J.K.C. and C.I.W. acknowledge the support of Dragon Gate Program by the National Science Council in Taiwan. We thank Professor George Rossman for the use of Raman spectrometer, and acknowledge the use of XPS facilities at the Beckman Institute at Caltech.Attached Files
Published - 1.4953815.pdf
Submitted - 1605.04622.pdf
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Additional details
- Eprint ID
- 67958
- Resolver ID
- CaltechAUTHORS:20160616-072056557
- NSF
- Institute for Quantum Information and Matter (IQIM)
- Sobhani Foundation
- Gordon and Betty Moore Foundation
- National Science Council (Taipei)
- Created
-
2016-06-16Created from EPrint's datestamp field
- Updated
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2023-03-14Created from EPrint's last_modified field
- Caltech groups
- Institute for Quantum Information and Matter, GALCIT