Improved field emission characteristics of individual carbon nanotube coated with boron nitride nanofilm

Abstract

Articles you may be interested inEffect of oxygen plasma on field emission characteristics of single-wall carbon nanotubes grown by plasma enhanced chemical vapour deposition system J. Appl. Phys. 115, 084308 (2014); 10.1063/1.4866995Low threshold field emission from high-quality cubic boron nitride films J. Appl. Phys. 111, 093728 (2012); 10.1063/1.4711093Effect of cubic phase evolution on field emission properties of boron nitride island films An individual multiwall carbon nanotube ͑CNT͒ synthesized without a catalyst by an arc discharge method is bonded to a tungsten tip. Field emission characteristics of the individual CNT coated with a boron nitride ͑BN͒ nanofilm are investigated. The BN film is synthesized by plasma-assisted chemical vapor deposition method in which boron trichloride ͑BCl 3 ͒ and nitrogen ͑N 2 ͒ are used as source gases. Deposition of the BN film with a thickness less than 10 nm onto the individual CNT is attempted. Field emission characteristics are measured in the chamber evacuated to 2 ϫ 10 −8 Pa. An anode electrode is set 25 mm away from the CNT sample. The turn-on electric field, designated as an electric field at an emission current of 1.0 nA, is compared between individual CNTs with and without the BN nanofilm. A significant reduction in the turn-on electric field is achieved by coating with the BN nanofilm. The turn-on electric field is estimated to be 1.2ϫ 10 −2 V / m for the uncoated individual CNT sample, and the turn-on electric field is estimated to be 8.2ϫ 10 −3 V / m for the CNT sample coated with BN nanofilm. Moreover, stable operation is demonstrated at an emission current as high as 1 ϫ 10 −5 A.

Surface characterisation of boron nitride layers on multiwalled carbon nanotubes

“…BN coatings were successively deposited onto MWCNT surfaces by the reaction of B 2 O 3 and NH 3 . It was verified that the key parameters of the process are:…”

“…However, the untreated CNT (Nano-1) formed agglomerates in water. Nano-1 Nanocyl 3100 9.5 95 Nano-2 Nanocyl 3100 3 h HNO 3 Nano-3 Nanocyl 3100 12 h H 2 SO 4 Nano-4 Nanocyl 7000 Detergent 9.5 90 Nano-5 Nanocyl 7000 3 h HNO 3 Shenzen A-MWCNT Aminobenzoic acid 30 95 The coating experiments were performed by dispersing the CNTs in boric acid solutions setting a predetermined B/C ratio. Addition of small amount of ethanol increased the wetting of the CNTs.…”

“…[3] • Infiltration of the CNTs with boric acid solution or mixing with boric acid powder followed by a heat treatment in NH 3 flow. [4 -6] • Treating CNTs in an aqueous boric acid-urea solution followed by a thermal treatment in N 2 atmosphere.…”

A novel method for formation of single crystalline tungsten nanotip

“…Nevertheless, h-BN is an insulator unlike graphite. We had tried to improve field emission characteristics by coating with h-BN thin film on various materials [4][5][6]. We coated the h-BN thin film on the W needle at a substrate temperature of 350 °C, by an ion plating method with Ar and N 2 gases in electron bombardment on B source.…”

Mathematical Analysis and Modeling of Single-Walled Carbon Nanotube Composite Material for Antenna Applications

“…The main target of coating approach is to improve the electrical and mechanical properties of the new SWCNT-composite materials. Also, several methods were implemented for coating the multi-walled CNTs (MWCNTs) and SWCNTs [21,[23][24][25][26][27]. Hence, the SWCNT-composite structure will be adopted and analyzed in this work.…”