The effect of gold nanoparticles on WO3 thin film

Abstract

Chemical spray pyrolysis technique was used at substrate temperature 250 ˚C with annealing temperature at 400 ˚C (for 1hour) to deposition tungsten oxide thin film with different doping concentration of Au nanoparticle (0, 10, 20, 30 and 40)% wt. on glass substrate with thickness about 100 nm. The structural, optical properties were investigated. The X-ray diffraction shows that the films at substrate temperature (250 ˚C) was amorphous while at annealing temperature have a polycrystalline structure with the preferred orientation of (200), all the samples have a hexagonal structure for WO3 and Au gold nanoparticles have a cubic structure. Atomic force microscopy (AFM) was used to characterize the morphology of the films. The optical properties of the films were studied using UV-Vis spectrophotometer within the wavelength in the range (300-1100) nm. The optical energy gap of the films was (2.80) eV for WO3 and it decreased at annealing temperature (400 ˚C) equal to (2.65) eV. And finally the optical constants such as refractive index, real and imaginary dielectrics, absorption coefficient, absorption, transmission, and extinction coefficient were investigated.

The Effect of Au Nanoparticles on the Structural and Optical Properties of (NiO:WO3) Thin Films Prepared by PLD Technique

“…The results showed that the films were amorphous. This result agrees with Myong et al [12] and with Ayat et al [13]. The XRD pattern showed very weak peaks at an angle of 43.3721 corresponding to a reflection of (200).…”

“…This should be ascribed to Au phase inhibiting the (NiO:WO3) grain growth. It can also be attributed to the fact that the atomic radii of Au particles are less than that of NiO leading to Myong et al [12] and with Ayat et al [13]. The XRD pattern showed very weak peaks at an angle of 43.3721 corresponding to a reflection of (200).…”

“…This material has many characteristics that make it distinctive, including its cheapness, chemical stability, non-toxicity and mechanical properties; Also, it is considered a catalyst for semiconductors [10,11]. On the other hand, the metallic noble Au nanoparticles are attracting much attention because of their excellent electrical efficiency, optical, physical, chemical and magnetic properties [12,13]. Also, it has pulsed photoabsorption, high dispersion in an aqueous medium, chemical inertness, and biocompatibility [14,15].…”

Influence of Silver Oxide Nanoparticles in the Enhancement of Electrochemical Properties of Binary Polymer Nanocomposite PTh-nAg2O

“…1b, the peak seen at 3448 cm-1 may be due to O-H stretching and deformation assigned to the water adsorption on the metal surface. The absorption band observed at 1628 cm -1 Ag − O are due to stretching vibration [25], while the band at 694 cm -1 corresponds to Ag-O interaction [27,28].…”

“…The obtained results are well in accordance with a standard ICDD le No: 761393, Which is indexed to the face-centred cubic structure, indicating they have a relatively high degree of crystallinity. In the XRD pattern of the PTh-nAg 2 O polymer nanocomposite, the planes (111) and (110) represent the pointers of silver oxide nanoparticles, and the peaks (211) and ( 220) correspond to the face-centred cubic crystal structure [27,28].…”