Plasma doping processes for CNT devices

Rikizo Hatakeyama, Toshiaki Kato, Yongfeng Li, Toshiro Kaneko

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


A variety of plasmas including positive and negative ions are prepared in gaseous, liquid, and gas–liquid interfacial phases in order to functionalize carbon nanotubes (CNTs) with properties corresponding to electronic and biomedical device applications. In the case of internal doping, alkali metal, alkaline-earth metal, halogen, iron atoms, fullerene, azafullerene, and DNA molecules are encapsulated inside single-walled carbon nanotubes (SWNTs) and double-walled carbon nanotubes (DWNTs) with hollow inner spaces using the plasma-ion irradiation method. The electrical, magnetic, and optical properties of the encapsulated SWNTs and DWNTs are found to be greatly changed compared with those of pristine ones. As a result, a number of significant and nanodevice-applicable transport phenomena are observed, in which air-stable carrier-type control, embedded formation of p–n junction, quantum dot formation, distinct negative differential resistance, magnetic semiconducting behavior, photoinduced electron transfer, and photoelectric conversion are highlighted here. Furthermore, the combination of internal and surface doping processes leads to the creation of Au nanoparticle–DNA_SWNT conjugates toward a nano-biomedical device application.

Original languageEnglish
Title of host publicationFrontiers of Graphene and Carbon Nanotubes
Subtitle of host publicationDevices and Applications
PublisherSpringer Japan
Number of pages21
ISBN (Electronic)9784431553724
ISBN (Print)9784431553717
Publication statusPublished - 2015 Jan 1


  • CNT devices
  • Encapsulation
  • Functionalization
  • Plasma doping


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