Multiwall carbon nanotubes filled with Al4C3: Spectroscopic signatures for electron-phonon coupling due to doping process

被引：12

作者：

Araujo, P. T. ^{[1
,2
]}

Barbosa Neto, N. M. ^{[3
]}

Sousa, M. E. S. ^{[3
]}

Angelica, R. S. ^{[4
]}

Simoes, S. ^{[5
]}

Vieira, M. F. G. ^{[5
]}

Dresselhaus, M. S. ^{[6
,7
]}

Leite dos Reis, M. A. ^{[8
]}

机构：

[1] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35401 USA

[2] Univ Alabama, Ctr Mat Informat Technol, MINT Ctr, Tuscaloosa, AL 35401 USA

[3] Univ Fed Para, Programa Posgrad Fis, Inst Ciencias Exatas & Nat, BR-66075110 Belem, Para, Brazil

[4] Univ Fed Para, Inst Geociencias, Programa Posgrad Geol & Geoquim, BR-66075110 Belem, Para, Brazil

[5] Univ Porto, Fac Engn, P-4200465 Oporto, Portugal

[6] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[7] MIT, Dept Phys, Cambridge, MA 02139 USA

[8] Univ Fed Para, Programa Posgrad Engn Recursos Nat Amazonia, BR-66075110 Belem, Para, Brazil

来源：

CARBON | 2017年 / 124卷

关键词：

Al4C3-MWCNTs; Density of states; Scanning electron microscopy; Transmission electron microscopy; Raman spectroscopy; Electron-phonon coupling; EXTENDED HUCKEL THEORY; RAMAN-SPECTROSCOPY; GRAPHENE; SINGLE; SCATTERING; TRANSPORT; PRESSURE; PLASMA; ENERGY;

D O I：

10.1016/j.carbon.2017.08.041

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The spectroscopic signatures related to doping mechanisms in multiwall carbon nanotubes filled with aluminum carbide (Al4C3@MWCNTs) were studied and interpreted relative to changes in their electronic and phononic structures. Unfilled MWCNTs were used as standard samples to help interpreting the filling and the doping processes. The samples were characterized via scanning electron microscopy, transmission electron microscopy, X-ray diffraction and resonant Raman spectroscopy. The electron-phonon coupling mechanisms associated to the Raman intensities, frequencies and linewidths of the G- and G'-band Raman modes were analyzed and connected to the doping mechanism in these multi-walled systems. Our results indicate that the Al4C3 particles transfer electrons to the MWCNTs. In order to shed light into the experimental findings, theoretical calculations were performed using two examples of filled and unfilled achiral MWCNTs and the results for the density of electronic states indicate that the two systems under consideration, exhibit metallic behavior, with aluminum carbide doping the carbon nanotubes, thereby supporting our experimental observations. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：348 / 356

页数：9

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