The optical density and topography characterizations of MWCNTs on Ni‐Cu/ a‐C:H substrates with different copper percentage

Abstract

In this article, the Ni-Cu nanoparticles (NPs) in the amorphous carbon hydrogenated thin films with different copper percentage by co-deposition of RF-plasma enhanced chemical vapor deposition were prepared using acetylene gas and Ni and Cu targets. The films deposited with 5% Cu have minimum value of the average diameter of Multi-walled Carbon Nanotubes, MWCNTs, in about of 100 nm. It can be seen that the lateral size values of the nanoparticles for films with 5% Cu have minimum value of 5.34 nm. Films deposited with 75% Cu have maximum value of optical density specially in high energy. The spectral density power of all films indicated the presence of fractal components in prominent topographies. Films deposited without Cu NPs have minimum value of fractal dimension in about of 2.96. The diagram of the bearing area versus the nanoparticles height has shown the percentage of cavities and single-layers. The single-layer contents of all films were about 95%.

Electrical, morphological, optical and mathematical simulations equations studies in CAZO, CZO, AZO and ZNO films

“…where the order number m is an integer for maxima and a half integer for minima, this value of m can now be used, along with n 1 , to calculate the "order number" m °for the different extremes using relationship (18). In previous reports (Rahimi et al, 2020a(Rahimi et al, , 2020bDalouji et al, 2020aDalouji et al, , 2020bDalouji et al, 2019), the optical transmittance and reflectance spectrum for films were showed. Now, the dependence of n on photon energy of the study thin films is shows in Figure 10(b).…”

“…In these samples, the shift in absorption edge was increased from 3.15 eV (l ¼ 393.6 nm) to 3.05 eV (l ¼ 406.5 nm) and 3.03 eV (l ¼ 408.7 nm) to 2.92 eV (l ¼ 424.6 nm) for CZO films, respectively. The optical density, D opt of samples can be obtained from the following formula (Dalouji et al, 2020a(Dalouji et al, , 2020b):…”

“…In the low photon energy range, it is assumed that the spectral dependence of the absorption edge follows the empirical Urbach rule given by the following relationship (Rahimi et al, 2020a(Rahimi et al, , 2020bDalouji et al, 2020aDalouji et al, , 2020b:…”

“…The last of these permits the synthesis of AZO thin films at low temperatures (Mickan et al, 2016;Wang et al, 2011;Kim and Kim, 2011) and over flexible substrates (Li et al, 2014). In previous papers, we investigated topology, optical, structural properties and also the optical dispersion parameters, such as absorption coefficients in CAZO films, CZO films, and the variations of these parameters were evaluated in terms of annealing temperature (Rahimi et al, 2020a(Rahimi et al, , 2020bDalouji et al, 2020aDalouji et al, , 2020bDalouji and Rahimi, 2022). The present reports are study of the morphological properties using 3D and 2D AFM images, optical and electrical properties in the wavelength range of 200-2,500nm for ZnO, AZO, CZO and CAZO films (thickness about 230 nm) prepared by RF magnetron sputtering in the room temperature for as-deposited films and films annealed at 500°C in argon atmosphere.…”

Effect of Magnetic and Electric Fields on Synthesis of Cu Nanoparticles by Laser Ablation Method and Investigation of their Structural Properties

“…These interesting and unique properties of copper have led to many applications in architectures, auto-motives, bio-medicals, solar cells, sensors, catalysis, optoelectronics and etc [6,7]. Copper-based nanoparticles are synthesized by a variety of chemical and physical methods such as chemical precipitation, sol-gel, sonochemical, hydrothermal, electrochemical, photochemical, biological method, mechanical-ball milling, pulse laser ablation, micro-emulsion, thermal decomposition, microwave synthesis method and etc [8, 9,[18][19][20][21][22][10][11][12][13][14][15][16][17].…”