TY - JOUR
T1 - Preparation of Hierarchically Assembled Silver Nanostructures based on the Morphologies of Crystalline Peptide-Silver(I) Complexes
AU - Miyake, Ryosuke
AU - Nitanai, Yukari
AU - Nakagawa, Yuki
AU - Xing, Junfei
AU - Harano, Koji
AU - Nakamura, Eiichi
AU - Okabayashi, Jun
AU - Minamikawa, Takeo
AU - Uruma, Keirei
AU - Kanaizuka, Katsuhiko
AU - Kurihara, Masato
N1 - Funding Information:
This research was partly supported by Grant-in-Aid for Young Scientists (B) (Grant No. 25810037 to R. M., the Ministry of Education, Culture, Sports, Science and Technology of Japan), Grant-in-Aid for Scientific Research on Innovative Areas (JP17H05355 to K. H., JSPS), CREST (JPMJCR14L4 to E. N., JST) and PRESTO (JPMJPR151A to R. M., JST). We also thank Dr. Takanari Togashi (Yamagata University) for fruitful discussion, and Dr. Akira Ando, Dr. Takao Sakuma, Ms. Tomoko Tanaka and Ms. Mariko Onozawa (Ochanomizu University) for their assistance in preparation and measurement of the samples.
Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/3
Y1 - 2019/3
N2 - 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.
AB - 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.
KW - hierarchical structures
KW - nanocrystalline assembly
KW - nanostructures
KW - peptides
KW - silver
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U2 - 10.1002/cplu.201800666
DO - 10.1002/cplu.201800666
M3 - Article
C2 - 31950758
AN - SCOPUS:85063606618
VL - 84
SP - 295
EP - 301
JO - ChemPlusChem
JF - ChemPlusChem
SN - 2192-6506
IS - 3
ER -