Electronic and magnetic structure of Fe/Co-doped multiwalled carbon nanotubes using X-ray absorption and magnetic circular dichroism spectroscopy
Source abstract
Abstract
Multi-walled carbon nanotubes (MWCNTs), synthesized using the microwave plasma-enhanced chemical vapor deposition (MPCVD) technique, have been examined to elucidate their electronic and magnetic structures through near-edge X-ray absorption fine structure (NEXAFS) and X-ray magnetic circular dichroism (XMCD) spectroscopy. NEXAFS analysis at the Fe and Co L-edges reveals the presence of Fe-metal nanoparticles embedded within the CNT lattice, along with divalent Co ions coordinated to the matrix in an octahedral symmetry. Furthermore, the appearance of two distinct NEXAFS peaks between the π* and σ* transitions indicates 1s to sp3 hybridization, attributed to the interaction of Fe and Co2+ ions with the carbon nanotube structure. Additionally, XMCD spectra confirm that MWCNTs exhibit room temperature ferromagnetism, primarily driven by Fe–C and Co–C bonding within the nanotubes. This intrinsic ferromagnetic behavior, along with the high aspect ratio and unique electronic properties of MWCNTs, highlights their promising potential for applications in spintronic storage devices.
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Research context
OpenAlex topics: Carbon Nanotubes in Composites · Graphene research and applications · Supercapacitor Materials and Fabrication
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Advanced Functional Materials Lab., Dr. SSB Univ. Inst. of Chemical Engineering & Technology, Panjab University 1 , Chandigarh 160014,
Department of Physics, Panjab University 2 , Chandigarh 160014,
3 Energy Research Centre, Panjab University, Chandigarh 160014, India
4 Diamond Light Source, Didcot, Oxfordshire OX11 0DE, United Kingdom
Department of Physics, Deva Matha College 5 , Kottayam, Kerala 686633,
European Synchrotron Radiation Facility 6 , BP 220, F-38043 Grenoble Cedex,
7 Korea Basic Science Institute, Daejeon 34133, Republic of Korea
Advanced Analysis and Data Center, Korea Institute of Science and Technology 8 , Seoul 02792,
Funding
Anusandhan National Research Foundation, India
References (51)
Show source-provided references
1. Helical microtubules of graphitic carbon10.1038/354056a0 ↗
2. Comprehensive review on carbon nanotubes embedded in different metal and polymer matrix: Fabrications and applications10.1080/10408436.2021.1935713 ↗
3. Long-term prospects of nano-carbon and its derivatives as anode materials for lithium-ion batteries—A review10.1016/j.est.2023.108178 ↗
4. Electrochemical characterization of silicon/graphene/MWCNT hybrid lithium-ion battery anodes produced via RF magnetron sputtering10.1016/j.apsusc.2016.07.135 ↗
5. Observation of critical magnetic behavior in 2D carbon based composites10.1039/c9na00663j ↗
6. Recent advances in magnetic carbon nanotubes: Synthesis, challenges and highlighted applications10.1039/d1tb01242h ↗
7. Advances in magnetics roadmap on spin-wave computing10.1109/tmag.2022.3149664 ↗
8. Hamiltonian quantum computing with superconducting qubits10.1088/2058-9565/ab18dd ↗
9. Room-temperature quantum bit storage exceeding 39 minutes using ionized donors in silicon-2810.1126/science.1239584 ↗
10. Ultralong spin coherence time in isotopically engineered diamond10.1038/nmat2420 ↗
11. Silicon spin qubits from laboratory to industry10.1088/1361-6463/acd8c7 ↗
12. Optically coherent nitrogen-vacancy defect centers in diamond nanostructures10.1103/physrevx.13.011042 ↗
13. Spin-orbit interaction and anomalous spin relaxation in carbon nanotube quantum dots10.1103/physrevb.77.235301 ↗
14. Stable organic radical qubits and their applications in quantum information science10.1016/j.xinn.2024.100662 ↗
15. Y. Wu , “Quantum computation in large ion crystals,” Ph.D. thesis, 2019.
16. The decoration of multi-walled carbon nanotubes with nickel oxide nanoparticles using chemical method10.1007/s40089-016-0185-8 ↗
17. Enhancement of CNT-based filters efficiency by ion beam irradiation10.1016/j.radphyschem.2018.01.007 ↗
18. Defect formation in multiwalled carbon nanotubes under low-energy He and Ne ion irradiation10.3762/bjnano.9.186 ↗
19. Room-temperature magnetic order on zigzag edges of narrow graphene nanoribbons10.1038/nature13831 ↗
20. Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles10.1016/j.apsusc.2016.06.027 ↗
21. Magnetism in two-dimensional materials beyond graphene10.1016/j.mattod.2019.03.015 ↗
22. π-electron ferromagnetism in metal-free carbon probed by soft x-ray dichroism10.1103/PhysRevLett.98.187204 ↗
23. Theoretical and experimental study of the graphite 1s x-ray absorption edges10.1103/PhysRevB.54.14396 ↗
24. Defect-induced magnetism in graphite through neutron irradiation10.1103/physrevb.90.214435 ↗
25. Magnetic graphene–carbon nanotube iron nanocomposites as adsorbents and antibacterial agents for water purification10.1016/j.cis.2015.10.006 ↗
26. Design of covalently functionalized carbon nanotubes filled with metal oxide nanoparticles for imaging, therapy, and magnetic manipulation10.1021/nn5040923 ↗
27. Experimental confirmation of the x-ray magnetic circular dichroism sum rules for iron and cobalt10.1103/physrevlett.75.152 ↗
28. Microscopic origin of magnetic anisotropy in au/co/au probed with x-ray magnetic circular dichroism10.1103/physrevlett.75.3752 ↗
29. Anisotropic x-ray magnetic linear dichroism at the L2,3 edges of cubic Fe, Co, and Ni: Ab initio calculations and model theory10.1103/PhysRevB.67.024431 ↗
30. Roles of pH and acid type in the anodic growth of porous alumina10.1063/1.2790429 ↗
31. Characterization of fluorinated multiwalled carbon nanotubes by x-ray absorption spectroscopy10.1134/s1063783408030323 ↗
32. Fermi-level lowering and the core exciton spectrum of intercalated graphite10.1103/physrevlett.43.68 ↗
33. Comparison of electronic structure and magnetic properties of few layer graphene and multiwall carbon nanotubes10.1155/2016/7362131 ↗
34. Experimental and theoretical study of electronic structure of disordered MWCNTs10.1016/j.carbon.2019.06.104 ↗
35. Structure and electrochemical characterization of SnOx/Sn@MWCNT composites formed by pulsed ion beam irradiation10.1016/j.jallcom.2019.04.066 ↗
36. Angle-resolved soft-x-ray fluorescence and absorption study of graphite10.1103/physrevb.50.10457 ↗
37. Graphitic interlayer states: A carbon K near-edge x-ray-absorption fine-structure study10.1103/physrevb.44.1427 ↗
38. Electronic structure of the Fe-layer-catalyzed carbon nanotubes studied by x-ray-absorption spectroscopy10.1063/1.1416165 ↗
39. Electronic structure of the carbon nanotube tips studied by x-ray-absorption spectroscopy and scanning photoelectron microscopy10.1063/1.1523152 ↗
40. Oxygen-containing functional groups on single-wall carbon nanotubes: NEXAFS and vibrational spectroscopic studies10.1021/ja011021b ↗
41. X-ray absorption and photoelectron spectroscopy studies on graphite and single-walled carbon nanotubes: Oxygen effect10.1063/1.2006214 ↗
42. X-ray absorption study of graphene oxide and transition metal oxide nanocomposites10.1021/jp503941t ↗
43. Nanoflaky MnO2/functionalized carbon nanotubes for supercapacitors: An in situ X-ray absorption spectroscopic investigation10.1039/c4nr06439a ↗
44. Electronic charge transfer in cobalt doped fullerene thin films and effect of energetic ion impacts by x-ray absorption spectroscopy10.1016/j.tsf.2011.03.059 ↗
45. An x-ray absorption approach to mixed and metallicity-sorted single-walled carbon nanotubes10.1007/s10853-010-4577-2 ↗
46. Visualizing electronic interactions between iron and carbon by x-ray chemical imaging and spectroscopy10.1039/c5sc00353a ↗
47. Chemical effects at metal/oxide interfaces studied by x-ray-absorption spectroscopy10.1103/physrevb.64.214422 ↗
48. Co–Ni-based nanotubes/nanosheets as efficient water splitting electrocatalysts10.1002/aenm.201501661 ↗
49. Probing temperature-dependent magnetism in cobalt and zinc ferrites: A study through bulk and atomic-level magnetic measurements for spintronics10.1016/j.jmmm.2024.171867 ↗
50. Stable Fe nanomagnets encapsulated inside vertically-aligned carbon nanotubes10.1039/c7cp05181f ↗
51. Structure and bonding in amorphous iron carbide thin films10.1088/0953-8984/27/4/045002 ↗