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Preparation of Hierarchically Assembled Silver Nanostructures based on the Morphologies of Crystalline Peptide‐Silver(I) Complexes
Author(s) -
Miyake Ryosuke,
Nitanai Yukari,
Nakagawa Yuki,
Xing Junfei,
Harano Koji,
Nakamura Eiichi,
Okabayashi Jun,
Minamikawa Takeo,
Uruma Keirei,
Kanaizuka Katsuhiko,
Kurihara Masato
Publication year - 2019
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201800666
Subject(s) - dipeptide , nanocrystalline material , nanostructure , materials science , x ray photoelectron spectroscopy , scanning electron microscope , crystallography , thermogravimetric analysis , morphology (biology) , chemical engineering , nanotechnology , chemistry , peptide , organic chemistry , biochemistry , biology , engineering , composite material , genetics
The preparation of a hierarchically assembled Ag nanostructures based on a nanocrystalline assembly was demonstrated using an Ag(I) complex of a dipeptide (AspDap). By heating under N 2 gas, a spherical assembly of a nanocrystalline dipeptide‐Ag(I) complex (diameter 4–5 μm), which has a morphology similar to the assembled structure of the dipeptide, was transformed to an assembly of Ag nanostructures, where the micrometre‐order crystalline morphology was maintained. In addition, detailed scanning electron microscopy studies revealed that Ag nanoparticles (diameter ca. 10 nm) were formed on the surface of the Ag nanostructure. When the Ag(I) ions were reduced to Ag(0), this phenomenon exhibited surface dependence due to the anisotropic two‐dimensional Ag(I) arrangement in the crystals. Thermogravimetric measurements and X‐ray photoelectron spectroscopy revealed that the reduction proceeds in a stepwise manner around 200–250 °C, together with the removal of primary and secondary carboxylic groups in the dipeptide. Comparison with the heating process of the crystalline Ag(I) complex of β‐alanine indicated that stepwise reduction is key for maintaining the original micrometre‐order morphology.