Chemical spray pyrolysis technique was used at temperature 250˚C with annealing temperature at 400C˚( 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 and electrical properties were investigated. The structure properties shows that the films at substrate by x-ray diffraction (XRD) temperature (250˚C) was amorphous structure 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 .The mechanisms of dcconductivity of un-doped WO3 and doped with Au (10,20,30 and 40) wt.% thin films at the range (303 to 473) K have been discussed , there is decrease in conductivity with the increase in the doping concentration and hall measurements show that all films have a negative hall coefficient and nH increases with the increase of Au dopant ratio and decreasing in carrier mobility (μH) with increasing of Au .

Chemical spray pyrolysis technique was used at temperature 250˚C with annealing temperature at 400C˚( 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 and electrical properties were investigated. The structure properties shows that the films at substrate by x-ray diffraction (XRD) temperature (250˚C) was amorphous structure 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 .The mechanisms of dc-conductivity of un-doped WO3 and doped with Au (10,20,30 and 40) wt.% thin films at the range (303  to 473) K have been discussed , there is decrease in conductivity with the increase in the doping concentration and hall measurements show that all films have a negative hall coefficient and nH  increases with the increase of Au dopant ratio and decreasing in carrier mobility (μH) with increasing of Au .

This research aims to prepare gold nanoparticles by the biological method, using the licorice as a reduced agent, and to investigate the potential of gold nanoparticles as antibacterial agents. Nanoparticles of the distinctive gold peak have been observed at a wavelength of 515–518[Formula: see text]nm before and after adding the plant extract; this is known as plasmonic surface resonance, where the particles were synthesized and tested using several techniques such as using ultraviolet–visible radiation, zeta potentials, FT-IR, TEM, XRD FTIR measurement detection that shows peaks Absorption at 1388[Formula: see text]cm[Formula: see text] C–O extension of a carboxylic acid. TEM measurements show particles with a size of 39[Formula: see text]nm under ideal conditions, the crystallization phase of the XRD patterns of the produced Au NPs was (38.41, 44.6, 64.72, 77.618), correspond to (111), (200), (220), and (311) plane of metallic Au, confirming the crystal structure of Au. The generated AuNPs are relatively stable, due to the coating process, licorice extract is critical to maintaining the stability of the nanoparticles and preventing them from agglomerating. Compared to the uncoated gold nanoparticles, the coated licorice extract shows a larger zeta capacity (15.8 mV). For two pathogenic bacteria of Streptococcus mutans, Mirabilis proteome was (6–22) and (6–25)[Formula: see text]mm. The results show that licorice extract can be used for more environmentally friendly production of AuNPs with homogeneous particle sizes.