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Inside Front Cover: Surfactant‐Assisted Preparation of Novel Layered Silver Bromide‐Based Inorganic/Organic Nanosheets by Pulsed Laser Ablation in Aqueous Media (Adv. Funct. Mater. 17/2007)
Author(s) -
He C.,
Sasaki T.,
Zhou Y.,
Shimizu Y.,
Masuda M.,
Koshizaki N.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200790059
Subject(s) - nanosheet , materials science , nanocomposite , aqueous solution , bromide , bilayer , chemical engineering , pulmonary surfactant , cationic polymerization , laser ablation , inorganic chemistry , nanotechnology , polymer chemistry , organic chemistry , membrane , laser , chemistry , optics , engineering , biochemistry , physics
Novel layered AgBr‐based inorganic/organic nanosheets can be prepared by pulsed laser ablation of Ag in an aqueous solution of cetyltrimethylammonium bromide (CTAB), report Takeshi Sasaki, Naoto Koshizaki, and co‐workers on p. 3554. The green image shows the distribution of carbon in a nanosheet deposited on a holey carbon film. The nanosheet structure is composed of anionic bromine‐rich AgBr inorganic layers and cationic surfactant layers (CTA+) with an interdigitated bilayer arrangement. A novel layered AgBr‐based inorganic/organic nanocomposite was prepared by pulsed laser ablation (PLA) of Ag in aqueous media in the presence of cetyltrimethylammonium bromide (CTAB), and the formation mechanism of two‐dimensional nanosheet was discussed. TEM observations indicate that the obtained AgBr‐based inorganic/organic nanocomposite possesses a well‐defined two‐dimensional shape and that the size of the nanosheet can be changed with the surfactant concentration in the solution. X‐ray diffraction (XRD) pattern was composed of a series of peaks that could be indexed to (00 l ) reflections of a layered structure, and the basal spacing of 20.0 Å indicated that the surfactant was included between the AgBr interlayers in an interdigitated bilayer arrangement. In contrast, a layered inorganic/organic nanocomposite cannot be formed at a CTAB concentration lower than the critical micelle concentration (CMC). Based on our detailed investigation, we proposed the nanocomposite formation process, that is, that negatively charged inorganic AgBr was produced by a strong reaction between the ablated Ag species and the bromide ions, which are concurrently assembling with cationic surfactant molecules controlled by the charge‐matching mechanism.