Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (11): 9999-9999.doi: 10.3866/PKU.WHXB201208172

• Retracted • Previous Articles    

【Retracted】Stability of Au Nanocrystals in 2D Superlattice

ZHAI Wei, WANG Jian-yuan   

  1. School of Science, Northwestern Polytechnical University, Xi’an, 710072, P.R. China
  • Received:2012-07-04 Revised:2012-08-16 Published:2012-10-17
  • Supported by:

    The project was supported by the Natural Science Foundation of Shaanxi Province, China (2012JQ8013), Aviation Foundation of China (2011ZF53065), and NPU Foundation for Fundamental Research (JC201155, JC20110280).

Abstract:

We synthesized 5.5 nm Au nanocrystals coated by dodecanethiol (C12SH26) by reverse micelle method. The Au nanocrystals are multiply twinned particles (MTP), which are mainly characterized by decahedral and icosahedral structures. The 2D hexagonal network self-organizationa of Au nanocrystals are realized on both amorphous carbon (AC) and highly oriented pyrolitic graphite (HOPG) surfaces. The stability of 2D superlattices of Au nanocrystals in vacuum has been systematically surveyed, and it is found that large single triangular nanocrystals have been formed after 75 days due to the coalescence among the neighboring nanoparticles and the rearrangement of the atomics. When the Au nanocrystals in 2D organizations are annealed in air (573 K, 15 min), higher ordered 2D self-assemblies are stable, whereas worm-like coalesced nanoparticles form in those less ordered organizations. This demonstrates that the thermal stability of 2D self-assemblies is determined by the level of nanocrystals ordering.

Key words: Au nanocrystals, Self-organization, 2D superlattice, Stability

MSC2000: 

  • O641