Gas sensor of Au/AgNPs/PSi/c-Si using pulsed laser ablation using a YAG:Nd laser

Abstract

Pulsed laser ablation in liquid was employed to synthesize silver nanopartical (Ag). Silver nanoparticles are synthesized by pulsed laser ablation of high purity zinc target in double distilled water with 36.924J/cm2 laser fluences at RT. UV–visible absorption and transmission electron microscope are used for the characterization of silver nanopartical (NPs). The optical properties, size, and the morphology of the synthesized silver nanopartical were influenced strongly by laser fluence and wavelength. The use of water gave spherical silver nanopartical NPs with average size 16nm. The absorbance spectrum of the silver nanoparticles solution displays a quasisymmetric absorption band centered at 417nm, which indicates that the nanoparticles in the growth solution are quasispherical approximately 8nm in size. The silver nanoparticles, was faint yellow in color. It is expected, that the obtained results will find applications in the synthesis of new materials with modified properties, in the fabrication of catalysts with optimized selectivity and efficiency, in medicine for preparation of nanoparticle-based probes with great potential for targeting, imaging and treating different diseases etc. Chemical interaction between the (100–400ppm) vapor methanol gas and Au/Ag NPs/p-PSi/c-Si device surface caused to some of variations in the output signal recorded as resistance decrease of device at room temperature.