การเตรียมและการหาลักษณะเฉพาะของอนุภาคนาโนผสมของเงิน ทองคำและแพลทินัม สำหรับใช้เป็นตัวเร่งปฏิกิริยา

Abstract

In this research, the multi-component metal nanoparticles composed of Ag, Au and Pt (Ag/Au/Pt) has been prepared by a successive reduction method. Ultraviolet-visible spectroscopy (UV-vis), transmission electron microscopy.(TEM) and energy-dispersive X-ray spectroscopy (EDX) were used to characterize the optical properties, morphologies and chemical compositions of the Pt deposited hollow Ag/Au nanoparticles, respectively. The results show that the Ag/Au/Pt nanoparticles show no absorption peak in the UV-vis region which is similar to the absorption behavior of the Pt nanoparticles. The TEM images show that the Ag/Au/Pt nanoparticles are almost spherical. The paticle diameter is ~20 nm. The EDX data confirm the presence of Ag, Au and Pt in the obtained samples. In addition, cyclic voltammetry was used to investigate the catalytic properties of the hollow Ag/Au/Pt nanoparticles for methanol oxidation. All samples of the Ag/Au/Pt nanoparticles, with different atomic ratio of Pt, exhibit higher current density than that of Pt nanoparticles. The results show that the Ag/Au/Pt nanoparticles provide good electrocatalytic activity for methanol oxidation.