Adsorption and interaction of hydrogen and oxygen on the surface of separate crystalline gold nanoparticles
- First Online:
- 59 Downloads
Crystalline 4- to 5-nm gold nanoparticles supported on graphite and oxidized silicon have been obtained by the impregnation method. Specific features of the adsorption and interaction of H2 and O2 on the Au surface have been investigated by scanning tunneling microscopy, Auger electron spectroscopy, and mass spectrometry. Hydrogen adsorbs dissociatively on separate Au nanoparticles. The Au-H bond energy is ∼1.7 eV. Oxygen adsorbs on the separate Au nanoparticles after hydrogen adsorption. The support nature has a significant effect on the reactivity of the H2 and O2 molecules adsorbed on the surface of the Au nanoparticles. A sufficient condition for water formation from oxygen and hydrogen on Au/SiO2/Si is that Au/SiO2/Si is exposed to H2 and then to O2. As distinct from what is observed for Au/SiO2/Si, water on the Au/graphite surface forms solely due to the successive adsorption of H2, O2, and H2.
KeywordsAu nanoparticles morphology adsorption activation H2 O2 H2O
Unable to display preview. Download preview PDF.