Adsorption of H2S on InP(001) studied by photoemission spectroscopy

Adsorption and Decomposition of H2S on InP(100)

“…A P-deficient surface was formed when phosphorus hydrides were desorbed from the surface at elevated temperatures. Results from a UPS measurement also showed that the peak intensity at E f − 0.7 eV, due to the presence of dangling bonds on the surface phosphorus atom, decreased with the increase of the H 2 S exposure on the InP surface . It may be noted in Figure that no emission is observed in the P 2p spectra in the binding energy region of 3−6 eV higher than that of the bulk.…”

“…Results from a UPS measurement also showed that the peak intensity at E f -0.7 eV, due to the presence of dangling bonds on the surface phosphorus atom, decreased with the increase of the H 2 S exposure on the InP surface. 15 It may be noted in Figure 2 that no emission is observed in the P 2p spectra in the binding energy region of 3-6 eV higher than that of the bulk. The emission in this region is an indication of the presence of a P-S bond.…”

“…Figures 1 and 2 show the core-level spectra of In 4d and P 2p on a clean InP(100) surface exposed to various amounts of H 2 S. In this study, the clean InP(100) surface exhibits a 4 × 2 LEED pattern with diffusive half-order streaky spots, in agreement with previous results. 15,19,20 This surface is believed to be In-rich with the presence of metallic In clusters on the surface. As shown in Figure 1, the intensities of the In 4d corelevel spectra are normalized to their maxima.…”

“…The dry passivation process may provide a more reliable surface with desirable reproducibility because the process is easier to control and has fewer sources of contamination. On the basis of UPS and XPS studies, it was found that H 2 S molecules can chemisorb and physisorb preferentially on the In atoms of the InP surface at 140 K. 15 In this study, synchrotron radiation soft X-ray photoelectron spectroscopy (XPS) is used to further elucidate the adsorption and thermal reaction of H 2 S molecules on the InP(100) surface.…”

Removal of phosphorus and sulfur from yellow phosphorus off-gas by metal-modified activated carbon

“…Masuda et al (1999) found that toluene and ethanol competed with H 2 S during the adsorption of H 2 S on ACs. Dudzik and Shimomura reported the combination of molecular H 2 S with the surface atoms of semiconductors by using X-ray photoelectron photoemission spectroscopy (Dudzik et al, 1995;Shimomura et al, 1997). There are also literatures of H 2 S adsorption on zinc titanate (Ma and Zhang, 1993;Ozdemir and Bardakci, 1999;Duan et al, 2004Duan et al, , 2005.…”