| Title | Enhanced Field Emission from a Carbon Nanotube Array Coated with a Hexagonal Boron Nitride Thin Film |
| Authors | Yang, Xiaoxia Li, Zhenjun He, Feng Liu, Mingju Bai, Bing Liu, Wei Qiu, Xiaohui Zhou, Hang Li, Chi Dai, Qing |
| Affiliation | Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China. Peking Univ, Sch Elect & Comp Engn, Shenzhen, Peoples R China. Chinese Acad Sci, Grad Univ, Coll Chem & Chem Engn, Beijing 100049, Peoples R China. |
| Keywords | carbon nanotubes electron sources field emission h-BN long lifetimes arrays thin films NEGATIVE ELECTRON-AFFINITY EMITTERS ALN |
| Issue Date | 2015 |
| Publisher | SMALL |
| Citation | SMALL.2015,11,(30),3710-3716. |
| Abstract | A high-quality field emission electron source made of a highly ordered array of carbon nanotubes (CNTs) coated with a thin film of hexagonal boron nitride (h-BN) is fabricated using a simple and scalable method. This method offers the benefit of reproducibility, as well as the simplicity, safety, and low cost inherent in using B2O3 as the boron precursor. Results measured using h-BN-coated CNT arrays are compared with uncoated control arrays. The optimal thickness of the h-BN film is found to be 3 nm. As a result of the incorporation of h-BN, the turn-on field is found to decrease from 4.11 to 1.36 V m(-1), which can be explained by the significantly lower emission barrier that is achieved due to the negative electron affinity of h-BN. Meanwhile, the total emission current is observed to increase from 1.6 to 3.7 mA, due to a mechanism that limits the self-current of any individual emitting tip. This phenomenon also leads to improved emission stability and uniformity. In addition, the lifetime of the arrays is improved as well. The h-BN-coated CNT array-based field emitters proposed in this work may open new paths for the development of future high-performance vacuum electronic devices. |
| URI | http://hdl.handle.net/20.500.11897/417226 |
| ISSN | 1613-6810 |
| DOI | 10.1002/smll.201403323 |
| Indexed | SCI(E) EI PubMed |
| Appears in Collections: | 信息工程学院 |
