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Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism
Published on: July 18, 2018
Gold Quantum Needles Synthesized by Thermal-Induced, One-Dimensional Oligomerization of Au24(SC2H4Ph)20
Yuya Hamasaki1, Ryota Jonoue1, Shinjiro Takano1
1Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
None:
Gold quantum needles (AuQNs), which have double-pointed cores Au1-(Au3)2+4n-Au1 (n = 1, 2, 3, etc.) protected by 2-phenylethanethiolate (PET) ligands, have attracted significant attention due to their unique NIR-responsive properties. Herein we demonstrate that these AuQNs can be synthesized through the long-term heating of a highly concentrated solution of Au24(PET)20 without the use of directing templates. Additionally, we obtained two unprecedented series of AuQNs that exhibit intense absorption in the NIR region as minor products. Based on density functional theory calculations, we propose that these two series of AuQNs possess single-truncated Au1-(Au3)5+4n and double-truncated (Au3)4+4n cores, respectively. These novel phenomena illustrate the potential of fusion-based synthesis for creating highly anisotropic gold nanostructures.
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