Synthesis and characterization of Au:CdO nanoparticles using laser ablation in liquid as gases sensors.

• Synthesis of Au:CdO nanoparticles via laser ablated. • Prepared porous silicon (PS) by photo-electrochemical etching method as substrate. • Study of structural, morphological and optical for Au:CdO NPs/PS. • Fabrication of Au:CdO NPs/PS as gas sensors. Laser ablation technique in solution has been advanced to achieve single step synthesis of varied gold: oxide nanocomposites with uniform morphology and supreme dispersibility. The core:shell Au:CdO nanoparticles were manufactured by using fundamental Nd:YAG laser (1064 nm) at several energy of laser 600, 800 and 1000 mJ/100pulses, after that deposited on surface of porous-Si (PS). PS is prepared by using photo-electrochemical etching (PECE) method of n-type Si wafer in 16% hydrofluoric acid (HF).Current density 12 mA/cm2 and time of etching was 15 min. The characteristics of Au:CdO NPs that have been synthesized were studied. The structural properties were investigated using X-ray diffraction (XRD). Furthermore, the results of the AFM "atomic force microscope" test indicated a 26.34 nm surface roughness for Au:CdO NPs, TEM "transmission electron microscope) revealed that the fabricated particles of Au:CdO were spherical shape, and Photoluminescence (PL) test. Finally, the effects of different operation temperatures on the gas sensor sensitivity, recovery, and response times of NO 2 and H 2 S gas sensors which created from synthesized samples were investigated. The maximum sensitivity of Au:CdO NPS/PS ablated by energy laser 800 mJ is approximately 93.5% and 67.81% of gas H 2 S and NO 2 respectively. [ABSTRACT FROM AUTHOR]