Chemically synthesised atomically precise gold clusters deposited and activated on titania. Part II

David Anderson, Rohul Adnan, Jason Alvino, Oliver Shipper, Baira Donoeva, Jan-Yves Ruzicka, Hassan Al Qahtani, Hugh Harris, Bruce Cowie, Jade Aitken, Vladimir Golovko, Gregory Metha, Gunther Andersson

    Research output: Contribution to journalArticlepeer-review

    36 Citations (Scopus)

    Abstract

    Synchrotron XPS was used to investigate a series of chemically synthesised, atomically precise gold clusters Aun(PPh3)y (n = 8, 9 and 101, y depending on the cluster size) immobilized on anatase (titania) nanoparticles. Effects of post-deposition treatments were investigated by comparison of untreated samples with analogues that have been heat treated at 200°C in O2, or in O2 followed by H2 atmosphere. XPS data shows that the phosphine ligands are oxidised upon heat treatment in O2. From the position of the Au 4f7/2 peak it can be concluded that the clusters partially agglomerate immediately upon deposition. Heating in oxygen, and subsequently in hydrogen, leads to further agglomeration of the gold clusters. It is found that the pre-treatment plays a crucial role in the removal of ligands and agglomeration of the clusters. This journal is

    Original languageEnglish
    Pages (from-to)14806-14813
    Number of pages8
    JournalPhysical Chemistry Chemical Physics
    Volume15
    Issue number35
    DOIs
    Publication statusPublished - 21 Sep 2013

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