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Emergence of Raman active D- band and unusually suppressed conductivity mediated by nanoscale defects in pencil-lead graphitic systems under 80 keV Xe+ ion irradiation
Emergence of Raman active D- band and unusually suppressed conductivity mediated by nanoscale defects in pencil-lead graphitic systems under 80 keV Xe+ ion irradiation
- Source :
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 463:1-6
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- The effect of 80 keV Xe+ ion irradiation on the Raman spectra and electrical conductivity of 10B pencil-lead graphitic systems is being reported. The creation of localized nanoscale defects and a nearly five-fold improvement in the root mean square (RMS) roughness have been ascertained through atomic force microscopy (AFM) imaging studies. The introduction of defects is also substantiated by the appearance of the ∼1360 cm−1 peak (D-mode) along with the fundamental G-band (∼1600 cm−1) in the Raman spectra. With increasing fluence, the D-to-G band intensity ratio offered an increasing trend up to ∼0.44. Moreover, I–V characteristics indicated a significant drop in the conductivity of the irradiated graphitic systems. We ascribe it to substantial lowering of the mobility of the electrons owing to enhanced carrier-defect scattering events occurring in the irradiated systems. Mediated by defects introduced, a clear connection between the Raman characteristics and carrier transport phenomena is established.
- Subjects :
- 010302 applied physics
Nuclear and High Energy Physics
Materials science
Scattering
02 engineering and technology
Electron
Conductivity
021001 nanoscience & nanotechnology
01 natural sciences
Molecular physics
Fluence
Ion
symbols.namesake
Electrical resistivity and conductivity
0103 physical sciences
symbols
Irradiation
0210 nano-technology
Raman spectroscopy
Instrumentation
Subjects
Details
- ISSN :
- 0168583X
- Volume :
- 463
- Database :
- OpenAIRE
- Journal :
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
- Accession number :
- edsair.doi...........50fc12d08f2f5b28dcc930635fadcaa9
- Full Text :
- https://doi.org/10.1016/j.nimb.2019.11.018