Carbon Thin Films Prepared by Pulsed Laser Deposition

Preparation of carbon nanoparticles by plasma-assisted pulsed laser deposition method—size and binding energy dependence on ambient gas pressure and plasma condition

“…Au is deposited on the film by vacuum evaporation. and Cn + ablated from a graphite target is n = 1-3, and molten droplets are hardly generated [1,[9][10][11][12]. Fig.…”

“…In this figure, any differences between the ratios for both ambiences are hardly seen. In order to understand the dependence of the sp 3 /sp 2 carbon ratio on pAr, we will introduce the 8 following surface chemistry model [18][19][20][21] and related data on kinetic energy εC+ of Cn + and Cn (n = 1-3) reported so far [9][10][11][12]22].…”

“…In this model, the energy range Ed for impinging Cn + , where the chemical bond of sp 2 at a sub-surface is displaced by sp 3 , was 50-80 eV. Therefore, the sp 3 content varies depending on εC+ values as follows: (1) In the case of PLD with ArF excimer laser, the main ablated species from graphite target were carbon clusters like Cn and Cn + (Cn/Cn + , n = 1-3) and their εC+ increased from 45 eV to 95 eV, as the laser fluence increased from 2 × 10 7 to 3 × 10 8 W/cm 2 [9][10][11][12]22]. According to this information, the present ablated species are Cn/Cn + (n = 1-3) and have εC+ around ~ 70 eV, since the present ArF laser fluence is ~1.05 × 10 8 W/cm 2 .…”

“…An amorphous carbon (a-C) thin film has been reported to be a promising material in various fields of industrial applications, such as field electron emitters, surface coatings and tribological materials [7][8][9][10][11][12][13][14]. In particular, efficient electron emission was observed from a-C thin films composed of nanoparticles [8].…”