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

Abstract

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 NO2 and H2S 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 H2S and NO2 respectively.