Browsing by Author "Asyana, V"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    KAJIAN EFEK KONSENTRASI SURFAKTAN BINER TERHADAP PENUMBUHAN NANO KRISTAL EMAS DI ATAS PERMUKAAN SUBSTRAT PADAT
    (2014-05-22) Asyana, V; Taer, E; Iwantono
    Gold nanoplates have been grown onto solid substrates by using seed-mediated growth method. The gold nanoplates have been grown at temperature of 28-30oC with a variety of concentration of surfactants (CTAB and PVP). Characterizations of the samples have been carried out by using UV-Vis spectroscopy, XRD and FESEM. UV-Vis spectra showed that the gold particles have grown with a various geometrical forms, such as spherical and others. XRD results informed that the present of two peaks at 2θ: 38.195o and 44.393o indicated the gold-nanoplates, with their crystal orientation of (111) and (200). FESEM images showed the size of the particles ranged from 31 nm to 50 nm, with a various of the geometrical forms, such as hexagonal faces, truncated hexagonal face, triangle face, cubic face
  • No Thumbnail Available
    Item
    SYNTHESIS AND CHARACTERIZATION OF GOLD NANOPLATES ONTO SOLID SUBSTRATES BY SEED-MEDIATED GROWTH METHOD
    (2014-07-01) Iwantono; Umar, Akrajas Ali; Taer, Erman; Asyana, V
    A simple technique of seed-mediated growth has successfully been performed to grow gold nanoplates onto solid substrates. The growth of gold nanoplates have been carried out at temperature of 28-30oC in the presence of a binary surfactant mixture: CTAB (cetyl trimethyl ammonium bromide) and PVP (poly-vinyl pyrrolidone) with their various concentrations. Characterizations of the samples have been carried out by using UV-Vis spectroscopy, XRD and FESEM. UV-Vis spectra showed that the gold particles have grown with a various geometrical forms, such as spherical and others. XRD results informed that the presence of two peaks at 2θ: 38.195o and 44.393o indicated the gold-nanoplates, with their crystal orientation of (111) and (200). FESEM images showed the edge-length size of nanoplates was dominated in the range of 11 nm to 50 nm, with a various of morphology nanoplates, such as hexagonal, truncated hexagonal, triangular, square and spherical shapes.