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Table 1 Field emission properties of the various CNT emitters on sharp substrates

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

Substrate

Production method

Emission area (cm2)

Best emission

Vacuum ambient (Pa)

Stability

Refs.

Conical tip

Plasma-enhanced CVD

1.6 × 10−6

26 μA, 1.2 kV/250 μm

4 × 10−7

10 μA, >20 h

[6]

Inductively coupled plasma CVD

~3 × 10−8(1 μm end diameter)

51 μA, 1 kV/250 μm

1.06 × 10−5

10 μA, >40 h

[16]

Pyrolysis of ferrocene

6.7 × 10−7

1 mA, 16.5 kV/5 cm

1 × 10−8

100 μA, >180 min

[17]

Plasma-enhanced CVD

1.2 × 10−9

~100 μA, 2.7 kV/1 mm

1 × 10−8

80 μA, >100 h

[18]

Wire

Arc

~5.9 × 10−4(125 μm ϕ, 0.3 mm length)

7 mA/cm2, 6 kV/1 mm

2.6 × 10−4

2 mA/cm2, >15 h

[34]

Plasma-enhanced CVD

~7.9 × 10−4(50 μm ϕ, 1 mm length)

1 mA, 4.3 V/1 mm

1 × 10−9

1 mA, >5,000 h

[35]

Flat plate

Arc/Ag paste

2 × 10−2

10 mA/cm2, 2.2 V/μm

~1 × 10−6

~210 μA, >8,000 h

[36]

Printed CNT

2.83

8 mA, 1.55 kV/0.5 mm

~1.3 × 10−5

~0.6 mA, >100 h

[4]

CVD

5.6 × 10−3

100 mA/cm2, 12 kV/1 mm

~1.3 × 10−5

~300 μA, >15 h

[8]

Flat tip

CVD/Ag NP paste

4.9 × 10−4

465 μA, 6.6 kV/2 mm

~1 × 10−3

~100 μA, >40 h

 

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