Nano Express

Nanoscale Research Letters

, 5:720

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

Stable Field Emitters for a Miniature X-ray Tube Using Carbon Nanotube Drop Drying on a Flat Metal Tip

  • Sung Hwan HeoAffiliated withDepartment of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST)
  • , Aamir IhsanAffiliated withDepartment of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST)
  • , Seung Hwa YooAffiliated withDepartment of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST)
  • , Ghafar AliAffiliated withDepartment of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST)
  • , Sung Oh ChoAffiliated withDepartment of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST) Email author 

Abstract

Stable carbon nanotube (CNT) field emitters for a vacuum-sealed miniature X-ray tube have been fabricated. The field emitters with a uniform CNT coating are prepared by a simple drop drying of a CNT mixture solution that is composed of chemically modified multi-walled CNTs, silver nanoparticles, and isopropyl alcohol on flat tungsten tips. A highly thermal- and electrical-conductive silver layer strongly attaches CNTs to the tungsten tips. Consequently, the field emitters exhibit good electron emission stability: continuous electron emission of around 100 μA at 2.3 V/μm has stably lasted over 40 h even at non-high vacuum ambient (~10−3 Pa).

Keywords

Carbon nanotube Field emission Drop drying Miniature X-ray tube