Applied Physics A

, 123:174

Effect of Au thickness on AuAg bimetallic growth on reconstructed Si(5 5 12) surfaces

  • Anjan Bhukta
  • Arnab Ghosh
  • Puspendu Guha
  • Paramita Maiti
  • Biswarup Satpati
  • Parlapalli Venkata Satyam
Article

DOI: 10.1007/s00339-017-0783-y

Cite this article as:
Bhukta, A., Ghosh, A., Guha, P. et al. Appl. Phys. A (2017) 123: 174. doi:10.1007/s00339-017-0783-y

Abstract

Large, stable and single domain unit cell with row-like structures makes reconstructed Si(5 5 12) surface an important one-dimensional growth template of nanostructures. We report on the morphological aspects of the growth of AuAg bimetallic nanostructures on a reconstructed Si(5 5 12) surface that has been deposited with a 0.5 monolayer (ML) Ag and various Au thicknesses (0.5 to 5.0 ML) to determine the optimum gold thickness for a growth of high aspect ratio of AuAg nanostructures. The mean aspect ratio of AuAg nanostructures increases up to Au thickness of 3.0 ML and for larger thickness the mean aspect ratio decreases. The prior growth of 0.5 ML Ag on reconstructed surface result in the formation of one-dimensional Ag strips which are helping for preferential nucleation sites along Si\(\left\langle 1\bar{1}0 \right\rangle\) to form AuAg bimetallic long aspect ratio structures. Followed by these early processes of growth, for Au thickness >3.0 ML, excess Au ad-atoms begin to accumulate along Si\(\left\langle 66\bar{5} \right\rangle\) and consequences reduction of mean aspect ratio of bimetallic nanostructures. Nanostructures are grown using molecular beam epitaxy method under ultra-high vacuum conditions and in situ scanning tunneling microscopy has been used to investigate the morphological variations. Determination of structural aspects and compositional analysis has been carried out using Rutherford backscattering spectrometry and high-resolution (scanning) transmission electron microscopy methods.

Funding information

Funder NameGrant NumberFunding Note
Department of Atomic Energy, Government of India
  • 11th and 12th Plan

Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Anjan Bhukta
    • 1
    • 2
    • 3
  • Arnab Ghosh
    • 4
  • Puspendu Guha
    • 1
    • 2
  • Paramita Maiti
    • 1
    • 2
  • Biswarup Satpati
    • 5
  • Parlapalli Venkata Satyam
    • 1
    • 2
  1. 1.Institute of PhysicsSachivalaya MargBhubaneswarIndia
  2. 2.Homi Bhabha National InstituteTraining School ComplexMumbaiIndia
  3. 3.School of Basic SciencesIndian Institute of Technology BhubaneswarBhubaneswarIndia
  4. 4.Department of PhysicsIndian Institute of Technology KharagpurKharagpurIndia
  5. 5.Saha Institute of Nuclear PhysicsKolkataIndia

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