Fabrication of Carbon Nanotube Field Emitters Using a Dip‐Coating Method

Abstract

A simple and robust dip-coating method for fabricating carbon nanotube (CNT) field emitters has been proposed. The thin multiwalled (tMW)CNTs synthesized by CVD were dispersed in various solutions such as N,N-dimethylformamide (DMF), isopropyl alcohol (IPA), N-methyl-2-pyrrolidinone (NMP), and dichloroethane (DCE). The weak adhesion between CNTs and substrate, a serious drawback of the dip-coating approach, was resolved by anchoring CNTs to the substrate via the melting of an indium layer. We found that the uniformity and density of the CNTs could be optimized by controlling the degree of dispersion of CNTs in solvents. The field-emission characteristics are also discussed.

Performance-determining factors in flexible transparent conducting single-wall carbon nanotube film

“…The purified SWCNTs were well dispersed in 1,2-dichloroethane (DCE) solvent without additives [14,16,17]. The low vaporization temperature of DCE (83.5°C) allows more SWCNT to be deposited on the substrate.…”

Flexible transparent conducting single-wall carbon nanotube film with network bridging method

“…After the first dip coating, the PET substrate was dried for 5 s. This coating procedure was repeated in the range of 100-400 times. The dip-coating process was conducted in a glove box with Ar atmosphere in order to avoid the moisture adsorption in the DCE [16]. The schematic representation for the dip-coating procedure is shown in Fig.…”

“…PET film with thickness of 100 µm was used as substrate for SWCNT coating. The purified SWCNT powder of 10 mg was immersed in dichloroethane (DCE) solvent of 100 mL [15,16]. The SWCNT/DCE mixture was sonicated in a bath type sonicator for 500 min at room temperature and centrifuged with a speed of 6800 rpm for 10 min.…”

Laser Patterning of Carbon-Nanotubes Thin Films and Their Applications

“…As the adsorption CNT solution dries, the CNT network is formed on the substrate. This method [42][43][44] has advantages in the fabrication of large area CNT films, but high conductivity requires the substrate to be dipped several times and the film thickness does not correlate linearly with the dipping times. Figure 4(c) is the schematic of the dip-coating method and the SEM image of the CNT film dip-coating on the substrate.…”