Da-wei Guan, Rui-min Wang, Xian-chi Jin, Dong-xu Dai, Zhi-bo Ma, Hong-jun Fan, Xue-ming Yang. Diffusion of Formaldehyde on Rutile TiO2(110) Assisted by Surface Hydroxyl Groups[J]. Chinese Journal of Chemical Physics , 2017, 30(3): 253-258. doi: 10.1063/1674-0068/30/cjcp1703030
Citation: Da-wei Guan, Rui-min Wang, Xian-chi Jin, Dong-xu Dai, Zhi-bo Ma, Hong-jun Fan, Xue-ming Yang. Diffusion of Formaldehyde on Rutile TiO2(110) Assisted by Surface Hydroxyl Groups[J]. Chinese Journal of Chemical Physics , 2017, 30(3): 253-258. doi: 10.1063/1674-0068/30/cjcp1703030

Diffusion of Formaldehyde on Rutile TiO2(110) Assisted by Surface Hydroxyl Groups

doi: 10.1063/1674-0068/30/cjcp1703030
  • Received Date: 2017-03-12
  • Rev Recd Date: 2017-03-25
  • As the photo-dissociation product of methanol on the TiO2(110) surface,the diffusion and desorption processes of formaldehyde (HCHO) were investigated by using scanning tunneling microscope (STM) and density functional theory (DFT).The molecular-level images revealed the HCHO molecules could diffuse and desorb on the surface at 80 K under UV laser irradiation.The diffusion was found to be mediated by hydrogen adatoms nearby,which were produced from photodissociation of methanol.Diffusion of HCHO was significantly decreased when there was only one H adatom near the HCHO molecule.Furthermore,single HCHO molecule adsorbed on the bare TiO2(110) surface was quite stable,little photo-desorption was observed during laser irradiation.The mechanism of hydroxyl groups assisted diffusion of formaldehyde was also investigated using theoretical calculations.

     

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