Improved Field Emission Characteristics of Large-Area Films of Molybdenum Trioxide Microbelt

Figure 4

Optical images of the site distribution of the MoO₃ microbelt films grown with different separation of substrate and evaporation source: (a) 27 cm, (b) 32 cm, and (c) 37 cm under similar gap fields: (a) 𝐸=5.43 V/𝜇m, (b) 𝐸=5.43 V/𝜇m, (c) 𝐸=5.47 V/𝜇m, the corresponding substrate areas are 0.45cm×0.5cm, and 0.45cm×0.5cm and 0.45cm×0.5cm, respectively. (The sample area is indicated by the dashed line.)

(a)

(b)

(c)