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| - XAFS Studies of Soft-Heavy-Metal-Ion-IntercalatedMxMoS2 (M = Hg2+, Ag+) Solids
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| - XAFS studies were performed on two new soft-heavy-metal-ion-intercalated materials MxMoS2 (M = Hg2+, Ag+). For the compound Hg0.32MoS2, EXAFS results show an average Hgcoordination environment consisting of ≈2 S atoms at 2.38 Å and ≈0.2 (±35%) Hg atoms at2.55 Å. Along with Hg XANES analysis, these data indicate that the Hg atoms in thiscompound are present as a mixture of mercuric and mercurous ions. Ag EXAFS analysis ofthe compound Ag0.61MoS2 indicates a Ag coordination environment consisting of ≈2 S atomsat 2.43 Å. Ag EXAFS and XANES results for heat-treated Ag0.61MoS2 indicate that the Agcoordination environment has changed to that nearly identical for silver metal with severalAg−Ag interactions detected. The results suggest that heat treatment of Ag0.61MoS2 facilitatesthe chemical reduction of the intercalated silver ions to elemental silver. In addition, MoEXAFS and XANES analyses indicate that both the Hg- and Ag-intercalated compoundshave significant amounts of the 1T-phase of MoS2 in them. Prolonged exposure of both ofthese materials to an aerobic atmosphere does not affect their Mo EXAFS. Comparison ofthese results with those for exfoliated and restacked MoS2 suggests that different intercalatedguest ions afford different oxidative stabilities to the host MoS2 layers. This hypothesis isused to rationalize some inconsistencies in previous reports of MxMoS2 XAFS studies.
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