Synthesis of metal nanoclusters within microphase-separated diblock copolymers: sodium carboxylate vs carboxylic acid functionalization

被引:32
作者
Clay, RT [1 ]
Cohen, RE [1 ]
机构
[1] MIT, Dept Chem Engn, Cambridge, MA 02139 USA
来源
SUPRAMOLECULAR SCIENCE | 1998年 / 5卷 / 1-2期
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
sodium carboxylate; block copolymer; microphase-separated;
D O I
10.1016/S0968-5677(97)00063-1
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Conversion of carboxylic acid groups, within the morphologies of [MTD](400)[NORCOOH](50) diblock copolymers, to the sodium carboxylate form, [MTD](400)[NORCOONa](50), results in large increases in both the rate and extent of transition metal and rare earth ion uptake from metal acetates, chlorides, nitrates, and sulfates. A[MTD](400)[NORCOONa](50) film was subjected to four consecutive Ag+ loading and reduction sequences, resulting in a cumulative loading of approximately 26 wt% Ag in the overall polymer/Ag composite. Mean crystal diameters of 37, 50, 64, and 65 Angstrom were estimated following the first, second, third, and fourth, loading and reduction sequences, respectively. During a single loading and reduction sequence, cluster size (ca. 30 Angstrom) within [MTD](400)[NORCOOH](50) was found to be relatively insensitive to the extent of Ag+ uptake, for loadings between 40 and 500 mg Ag+/g polyNORCOOH, consistent with a nucleation-controlled cluster formation process. (C) 1998 Elsevier Science Limited.
引用
收藏
页码:41 / 48
页数:8
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