Table 1.

The summary of the FE cathodes in a form of a film made of the suspension, grouped according the method to form a film.

CNT	Solvent, Additives/Fillers	Technology	Eth & (V/μm)	Vth % (V)	t$ (h)	I (mA/cm2)	I (μA)	Ref.
SW	Nitric and sulfuric acid/−	electrophoresis	−	900	18	−	103	[82]
MW	unknown/−	Screen printing	1,5	~300	8000	10	~200	[23]
MW	polystyrene/−	Screen printing or casting	30	−	50	0,8	1	[55]
SW	IPA, nitrocellulose/-	Screen printing	3.0	−	−	90	1500	[65]
MW	EtOH, tributyl Phosphate, texanol, ethyl cellulose/Ni, TiO2	Screen printing	−	1500	10	−	5 × 103	[74]
Un-known	unknown	Screen printing	3.0	−	25	0.4	−	[104]
MW	polyvinyl alcohol, dibutyl phthalate/frits	Screen printing	2.5	−	~1.5	35	−	[105]
Un-known	Unknown/unknown	Screen printing	−	2.5 (tri)	24	−	48.2	[106]
Un-known	Terpinol, organic binders, inorganic frits/−	Screen printing	1.5	−	100	1	−	[111]
DW #	Organic binders/−	Screen printing	3.05	1220	−	−	20 × 103	[128]
SW	Organic binders/−	Screen printing	~12.5	−	−	−	5 × 105	[132]
MW	Texanol, acryl/Ni and TiO2 nanoparticles	Screen printing	2.2	−	−	−	1 × 105	[138]
MW	Glass frits, organic binders/−	Screen printing	−	4500	−	−	103	[139]
MW	Terpinol/Cu alloy and Al2O3 nanoparticles	Screen printing	−	3 × 104 (tri.)	−	−	5 × 104	[142]
DW	Ethyl cellulose/−	Screen printing	1.3	−	−	1	−	[146]
MW	Ethyl cellulose, terpineol/SiC and Ni nanoparticles	Screen printing	3500 (tri.)	−	−	20	10	[163]
Un-known	−/Bi and Na	Screen printing	6.5	−	−	4	3 × 104	[152]
SW	Photo-sensitive vehicles/−	Screen printing and photo-lithography	−	80 (tri.) +	−	−	~50	[66]
MW	Spin-on-glass, organic vehicle, photosensitive monomers, photosensitive oligomers, and photoinitiators	Screen printing and photo-lithography	2.46	−	−	9	−	[110]
Un-known	Ethyl cellulose, terpinol, photosensitive resin/Ag particles	Screen printing and photo-lithography	10	2000	−	0.2	−	[117]
Un-known	IPA, acrylate, cellulose, frit glass/SnO2	Screen printing and photo-lithography	3.6	−	12	2.0	−	[140]
MW	Texanol, photosensitive compounds, acryl/TiO2 microparticles and SnO2 nanoparticles	Screen printing and photo-lithography	17	−	−	50	−	[149]
MW	Organic binders/−	Screen printing and laser irradiation	6.2	−	−	20	−	[130]
MW	Photoimageable compounds/−	Screen printing and oxygen trimming	−	5000 (tri.)	120	−	200	[134]
SW	Organic binders/−	Screen printing and Ar plasma	−	1280	−	−	3 × 104	[144]
MW	SiO2 sol, carboxymethyl cellulose, glycol/−	Screen printing and reactive ion etching	3.5	−	−	200	−	[145]
MW	1,2-dichloroethane/−	Spray coating	1.90	−	12	1.52	−	[94]
MW	1,2-dichloroethane/−	Spray coating	2.5	−	−	2	−	[124]
MW	EtOH	Deposition on a rod	4.6	−	~2	8.5	5.9 × 103	[77]
SW	Sodium dodecyl sulfate	Forming the triangular shape from a filtered and dried paste	~1.5	−	20	100	22.4	[78]
MW	sodium dodecyl sulfate/graphite powder	Deposition on a rod	3.2	−	20	2 × 104	8.5	[123]
SW	Water, surfactant	buckypaper	0.56	−	50	1	−	[102]
MW	Ferrocene-xylene	buckypaper	4.9	−	5	0.4	1	[103]
MW	nickel sulfate bath	electroplating	1.7	−	100	1	−	[117]
Un-known	Terpineol/Ni and SiC nanoparticles	Point contact method	−	3700	<1	1 × 104	220	[122]
Un-known	EtOH, epoxy resin/−	A film was mounted between glass slides	−	200	−	400	0.1–10	[86]

^# MW = multi-walled nanotubes; in particular, DW = double-walled nanotubes; ^ SW = single-walled nanotubes; * CVD = chemical vapor deposition; ^& subsequent electric field required for the particular emission current or current density, beyond the emission initiation [45]; ^% subsequent voltage applied and required for the particular current or current density, beyond the emission initiation. (in case of the triode configuration, it is not a gate voltage); ^$ it is the best-reported value in the reference; + tri. = triode configuration.