Silver-Doped Cadmium Oxide Nanoparticles Synthesized by Laser Ablation in Liquid for NO2 and H2S Gases' Detection

Pulsed laser ablation in liquid technique was used to prepare pure and doped CdO NPs with varied Ag concentrations. The prepared nanoparticles were characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV-vis spectroscopy, Field-emission scanning electron microscopy (FESEM) with energy dispersive spectroscopy (EDS), and atomic force microscopy. The FTIR and XRD data confirm the construction of CdO NPs doped with Ag. The morphology of pure CdO NPs was found to be agglomerated in bundles that resemble tangled nanowires, which changed to nanorods and interconnecting web architectures as Ag concentration increased. The absorption of these nanoparticles varied with Ag doping concentrations. Additionally, the gas-sensing properties of the pure and doped CdO sensor were investigated. The gas-sensing response of the composite nanoparticles' sensor to NO2 was 46, which was 1.8 times larger than the response of the pure CdO NP sensor (24.9). Thus, oxidizing gas (NO2) was found to be less sensitive to Ag-doped CdO nanocomposite sensors than reducing gas (H2S).

Automated summary

Pulsed laser ablation in liquid technique was used to prepare pure and doped CdO NPs with varied Ag concentrations. The prepared nanoparticles were characterized using FTIR, XRD, UV-vis spectroscopy, FESEM with EDS, and atomic force microscopy. The morphology of pure CdO NPs changed from agglomerated bundles to nanorods and interconnecting web architectures as Ag concentration increased. The gas-sensing response of the composite nanoparticles' sensor to NO2 was 46, which was 1.8 times larger than the response of the pure CdO NP sensor (24.9), indicating that oxidizing gas (NO2) was less sensitive to Ag-doped CdO nanocomposite sensors than reducing gas (H2S).