P1OS.2 - Localized surface plasmon resonance sensor by PdCl2-GNPs for Hydrogen gas
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-1 - Optical Sensors
- A. Farnood, M. Ranjbar, H. Salamati - Department of Physics, Isfahan University of Technology, Isfahan (Iran)
- 620 - 621
In this study gold nanoparticles (GNPs) with about 521 nm plasmonic peak were prepared by pulsed laser (Nd: YAG, λ=1064 nm) ablation (PLA) synthesis in DI water then different concentrations of PdCl2 solution including Pd:Au ratio 2:1, 1:1 and 1:2 were added. After adding process, PdCl2/Au coreshell agglomerations were observed on TEM images, which was attributed to a surface-chargeinduced agglomeration effect. It was shown that the obtained PdCl2-GNPs can detect very small amount of hydrogen through the surface plasmon spectral shift due to hydrogen reduction of PdCl2 to metal Pd, which results in change in particles surrounding dielectric constants. In the gas calibration curves, a linear dependency vs. hydrogen concentration was observed.