Silver tungstate microcrystals and their performance over several clinical multidrug resistant microorganisms

In this paper, we report the screening antimicrobial properties against several pathogenic microorganisms of silver tungstate microcrystals synthesized by the hydrothermal method at 120 degrees C for 12 h. These microcrystals were structurally characterized using the X-ray diffraction (XRD) and Rietveld refinement, where the ortho-rhombic structure (alpha-Ag2WO4) with space group and point group of Pn2n and C-2v(10), respectively. In according, the Raman spectrum and infrared spectrum are characteristic of pure alpha phase of silver tungstate exhibiting the main characteristic bands of orthorhombic structure. Thorough UV-vis by diffuse reflectance employing the Tauc's method the obtained optical band gap (E-gap) was 3.02(3) eV. While, the survey spectrum and high resolution Ag3d, O1s and W4f by X-ray photoelectron spectroscopy (XPS) are shown all biding energy peaks of characteristic elements of silver tungstate as well as, confirming the presence of Ag-0 for silver nanoparticles. Several rod-like microcrystals were archived by field emission scanning electron microscopy (FE-SEM), all these, exhibiting high definition and grown of silver nanoparticles with the increase of exposure time by electrons gun. Finally, the screening antimicrobial properties of alpha-Ag2WO4 confirm the high antimicrobial activity for main gram-positive and gram-positive bacteria with minimum inhibitory concentration (MIC) less than positive control (TIENAM). Therefore, the alpha-Ag2WO4 microcrystals synthesized have been exhibited promissory prop-erties in biomedical applications, particularly, in the multi-drugs gram-positive and gram-negative stains control.