4. Internally sealed compartments

8. BN nanotube and Ta/B/N catalytic particle

9. BN nanotube and Ta/B/N catalytic particle

10. SSingle wall nanotubes 1.4nm diam
Thess et al Nature

11. 1.4nm

12. Tip of MW-WS2-NT

15. Ta-B-N crystalline catalytic particle
Inflation zone

16. SiO2 coated cobalt particle

18. An apparently almost perfect MW MS2 NT

20. TEM image of NCNT bundle

22. BN nanotube and Ta/B/N catalytic particle

23. Ta/B/N crystalline catalytic particles
BN nanotubes

25. BN nanotube produced in an arc using a BN/Ta cathode

26. Ta-B-N crystalline catalytic particle
Amorphous BN material
Enters into the crystalline phase

27. Ta-B-N crystalline catalytic particle
Segregation zone

28. Ta-B-N crystalline catalytic particle
Inflation zone

29. Ta-B-N crystalline catalytic particle
3-wall BN nanotube

36. An apparently almost perfect MW MS2 NT

37. SiO2 coated cobalt particle

40. Iron particle catalysed MW-CNT

41. Nitrogen Doped CNTs

47. A suggested mechanism of formation for single walled carbon nanotubes
They are formed by laser ablation/deposition of graphite in the presence Ni/Co
The diameter is fairly uniform ca 1.4nm
The conditions are the same as for the formation of C60 so it is present in the system

48. General Research Strategy at Sussex
What fundamental information about nanotube formation can we deduce from their structures and the catalytic particles that create them?

49. SWNTs
Possible Formation mechanism
catalyst - C60 covered in Ni and Co
Explains 1.4nm diameter observed

51. Ferrocene
interplanar distance
3.4 nm

52. 1nm
Cross-sectional view of a bundle of single walled nanotubes with C60 molecules inside (Thess et al)

53. 1nm C60 molecules inside a single walled nanotube
Smith, Monthioux and Luzzi Nature 1998