45 research outputs found
Epitaxial deposition of silver ultra-fine nano-clusters on defect-free surfaces of HOPG-derived few-layer graphene in a UHV multi-chamber by in situ STM, ex situ XPS, and ab initio calculations
Get PDFThe growth of three-dimensional ultra-fine spherical nano-particles of silver on few layers of graphene derived from highly oriented pyrolytic graphite in ultra-high vacuum were characterized using in situ scanning tunneling microscopy (STM) in conjunction with X-ray photoelectron spectroscopy. The energetics of the Ag clusters was determined by DFT simulations. The Ag clusters appeared spherical with size distribution averaging approximately 2 nm in diameter. STM revealed the preferred site for the position of the Ag atom in the C-benzene ring of graphene. Of the three sites, the C-C bridge, the C-hexagon hollow, and the direct top of the C atom, Ag prefers to stay on top of the C atom, contrary to expectation of the hexagon-close packing. Ab initio calculations confirm the lowest potential energy between Ag and the graphene structure to be at the exact site determined from STM imaging
Developing an Empowerment Theology: TST 121
No full textDeveloping an Empowerment Theology: TST 121, Supplementary examination February 2010
Developing an Empowerment Theology: TST 121
No full textDeveloping an Empowerment Theology: TST 121, Supplementary examination February 2010
Empowerment by Hope: TST 221
No full textEmpowerment by Hope: TST 221, degree examination November 2009
History of Christianity in South Africa in the 20th Century: TCH 221
No full textHistory of Christianity in South Africa in the 20th Century: TCH 221, supplementary examination January 2010
Calvin; Church and State: TCH 502
No full textCalvin; Church and State: TCH 502, honours examination November 2009
Developing an Empowerment Theology: TST 121
No full textDeveloping an Empowerment Theology: TST 121, Supplementary examination February 2010
History of Christianity in South Africa in the 20th Century: TCH 221
No full textHistory of Christianity in South Africa in the 20th Century: TCH 221, degree examination November 2009
