The influence of substrate temperature on growth of para-sexiphenyl thin films on Ir(111) supported graphene studied by LEEM

F.S. Khokhar, G. Hlawacek, Raoul van Gastel, Henricus J.W. Zandvliet, C. Teichert, Bene Poelsema

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)
46 Downloads (Pure)

Abstract

The growth of para-sexiphenyl (6P) thin films as a function of substrate temperature on Ir{111} supported graphene flakes has been studied in real-time with Low Energy Electron Microscopy (LEEM). Micro Low Energy Electron Diffraction (μLEED) has been used to determine the structure of the different 6P features formed on the surface. We observe the nucleation and growth of a wetting layer consisting of lying molecules in the initial stages of growth. Graphene defects – wrinkles – are found to be preferential sites for the nucleation of the wetting layer and of the 6P needles that grow on top of the wetting layer in the later stages of deposition. The molecular structure of the wetting layer and needles is found to be similar. As a result, only a limited number of growth directions are observed for the needles. In contrast, on the bare Ir{111} surface 6P molecules assume an upright orientation. The formation of ramified islands is observed on the bare Ir{111} surface at 320 K and 352 K, whereas at 405 K the formation of a continuous layer of upright standing molecules growing in a step flow like manner is observed
Original languageEnglish
Pages (from-to)475-480
Number of pages6
JournalSurface science
Volume606
Issue number3-4
DOIs
Publication statusPublished - 2012

Fingerprint

electron microscopy
graphene
wetting
needles
thin films
temperature
energy
nucleation
molecules
flakes
molecular structure
electron diffraction
defects

Keywords

  • METIS-286054
  • Optics (see also 3311)Solid state physics (see also 2307)Niet in een andere rubriek onder te brengen
  • IR-80918

Cite this

@article{efaff00ad0584d0b8ebdc5f2c2dbfc37,
title = "The influence of substrate temperature on growth of para-sexiphenyl thin films on Ir(111) supported graphene studied by LEEM",
abstract = "The growth of para-sexiphenyl (6P) thin films as a function of substrate temperature on Ir{111} supported graphene flakes has been studied in real-time with Low Energy Electron Microscopy (LEEM). Micro Low Energy Electron Diffraction (μLEED) has been used to determine the structure of the different 6P features formed on the surface. We observe the nucleation and growth of a wetting layer consisting of lying molecules in the initial stages of growth. Graphene defects – wrinkles – are found to be preferential sites for the nucleation of the wetting layer and of the 6P needles that grow on top of the wetting layer in the later stages of deposition. The molecular structure of the wetting layer and needles is found to be similar. As a result, only a limited number of growth directions are observed for the needles. In contrast, on the bare Ir{111} surface 6P molecules assume an upright orientation. The formation of ramified islands is observed on the bare Ir{111} surface at 320 K and 352 K, whereas at 405 K the formation of a continuous layer of upright standing molecules growing in a step flow like manner is observed",
keywords = "METIS-286054, Optics (see also 3311)Solid state physics (see also 2307)Niet in een andere rubriek onder te brengen, IR-80918",
author = "F.S. Khokhar and G. Hlawacek and {van Gastel}, Raoul and Zandvliet, {Henricus J.W.} and C. Teichert and Bene Poelsema",
note = "Open access article",
year = "2012",
doi = "10.1016/j.susc.2011.11.012",
language = "English",
volume = "606",
pages = "475--480",
journal = "Surface science",
issn = "0039-6028",
publisher = "Elsevier",
number = "3-4",

}

The influence of substrate temperature on growth of para-sexiphenyl thin films on Ir(111) supported graphene studied by LEEM. / Khokhar, F.S.; Hlawacek, G.; van Gastel, Raoul; Zandvliet, Henricus J.W.; Teichert, C.; Poelsema, Bene.

In: Surface science, Vol. 606, No. 3-4, 2012, p. 475-480.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - The influence of substrate temperature on growth of para-sexiphenyl thin films on Ir(111) supported graphene studied by LEEM

AU - Khokhar, F.S.

AU - Hlawacek, G.

AU - van Gastel, Raoul

AU - Zandvliet, Henricus J.W.

AU - Teichert, C.

AU - Poelsema, Bene

N1 - Open access article

PY - 2012

Y1 - 2012

N2 - The growth of para-sexiphenyl (6P) thin films as a function of substrate temperature on Ir{111} supported graphene flakes has been studied in real-time with Low Energy Electron Microscopy (LEEM). Micro Low Energy Electron Diffraction (μLEED) has been used to determine the structure of the different 6P features formed on the surface. We observe the nucleation and growth of a wetting layer consisting of lying molecules in the initial stages of growth. Graphene defects – wrinkles – are found to be preferential sites for the nucleation of the wetting layer and of the 6P needles that grow on top of the wetting layer in the later stages of deposition. The molecular structure of the wetting layer and needles is found to be similar. As a result, only a limited number of growth directions are observed for the needles. In contrast, on the bare Ir{111} surface 6P molecules assume an upright orientation. The formation of ramified islands is observed on the bare Ir{111} surface at 320 K and 352 K, whereas at 405 K the formation of a continuous layer of upright standing molecules growing in a step flow like manner is observed

AB - The growth of para-sexiphenyl (6P) thin films as a function of substrate temperature on Ir{111} supported graphene flakes has been studied in real-time with Low Energy Electron Microscopy (LEEM). Micro Low Energy Electron Diffraction (μLEED) has been used to determine the structure of the different 6P features formed on the surface. We observe the nucleation and growth of a wetting layer consisting of lying molecules in the initial stages of growth. Graphene defects – wrinkles – are found to be preferential sites for the nucleation of the wetting layer and of the 6P needles that grow on top of the wetting layer in the later stages of deposition. The molecular structure of the wetting layer and needles is found to be similar. As a result, only a limited number of growth directions are observed for the needles. In contrast, on the bare Ir{111} surface 6P molecules assume an upright orientation. The formation of ramified islands is observed on the bare Ir{111} surface at 320 K and 352 K, whereas at 405 K the formation of a continuous layer of upright standing molecules growing in a step flow like manner is observed

KW - METIS-286054

KW - Optics (see also 3311)Solid state physics (see also 2307)Niet in een andere rubriek onder te brengen

KW - IR-80918

U2 - 10.1016/j.susc.2011.11.012

DO - 10.1016/j.susc.2011.11.012

M3 - Article

VL - 606

SP - 475

EP - 480

JO - Surface science

JF - Surface science

SN - 0039-6028

IS - 3-4

ER -