Electron scattering in graphene with adsorbed NaCl nanoparticles

Journal Article · Wed Jan 07 00:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4905418· OSTI ID:22399217

Drabińska, Aneta; Kaźmierczak, Piotr; Bożek, Rafał; Karpierz, Ewelina; Wysmołek, Andrzej; Kamińska, Maria ^[1]; Wołoś, Agnieszka ^[1]; Pasternak, Iwona; Strupiński, Włodek ^[2]; Krajewska, Aleksandra ^[2]

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1. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw (Poland)
2. Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw (Poland)

In this work, the results of contactless magnetoconductance and Raman spectroscopy measurements performed for a graphene sample after its immersion in NaCl solution were presented. The properties of the immersed sample were compared with those of a non-immersed reference sample. Atomic force microscopy and electron spin resonance experiments confirmed the deposition of NaCl nanoparticles on the graphene surface. A weak localization signal observed using contactless magnetoconductance showed the reduction of the coherence length after NaCl treatment of graphene. Temperature dependence of the coherence length indicated a change from ballistic to diffusive regime in electron transport after NaCl treatment. The main inelastic scattering process was of the electron-electron type but the major reason for the reduction of the coherence length at low temperatures was additional, temperature independent, inelastic scattering. We associate it with spin flip scattering, caused by NaCl nanoparticles present on the graphene surface. Raman spectroscopy showed an increase in the D and D′ bands intensities for graphene after its immersion in NaCl solution. An analysis of the D, D′, and G bands intensities proved that this additional scattering is related to the decoration of vacancies and grain boundaries with NaCl nanoparticles, as well as generation of new on-site defects as a result of the decoration of the graphene surface with NaCl nanoparticles. The observed energy shifts of 2D and G bands indicated that NaCl deposition on the graphene surface did not change carrier concentration, but reduced compressive biaxial strain in the graphene layer.

• OSTI ID: 22399217
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
77 NANOSCIENCE AND NANOTECHNOLOGY
ATOMIC FORCE MICROSCOPY
COHERENCE LENGTH
COMPARATIVE EVALUATIONS
CONCENTRATION RATIO
DEPOSITION
ELECTRON SPIN RESONANCE
ELECTRONS
GRAIN BOUNDARIES
GRAPHENE
INELASTIC SCATTERING
LAYERS
MAGNETORESISTANCE
NANOPARTICLES
RAMAN SPECTROSCOPY
SODIUM CHLORIDES
SPIN FLIP
STRAINS
SURFACES
TEMPERATURE DEPENDENCE
VACANCIES