A molecular template designed by the modification of a helix-forming β-1,3-glucan polysaccharide to fabricate one-dimensional nanostructures.
A molecular template designed by the modification of a helix-forming β-1,3-glucan polysaccharide to fabricate one-dimensional nanostructures.
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DOI：
10.1021/la101335a
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
Kouta Sugikawa;K. Kaneko;K. Sada;S. Shinkai
中科院分区：
文献类型：
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作者：
Kouta Sugikawa;K. Kaneko;K. Sada;S. Shinkai
本文报道了一种新型模板分子的开发，该模板分子是通过将螺旋形β-1,3-葡聚糖多糖修饰为阳离子半人工分子而设计的，并将其应用于简单光照射制备一维（1D）金纳米结构。透射电镜观察表明，Au（III）离子在阳离子β-1,3-葡聚糖多糖的作用下，首先还原成金纳米粒子自组装成一维阵列，并逐渐融合成具有带状结构的一维金纳米结构。中性β-1,3-葡聚糖多糖或随机线圈合成的阳离子聚合物都不能形成金纳米带结构。这些发现一致地支持了Au（III）离子在光照射下被未修饰的OH基团还原成金纳米颗粒的观点，金纳米颗粒包裹在阳离子β-1,3-葡聚糖多糖的螺旋结构中，最终融合成金纳米带。因此，我们可以认为，这种阳离子β-1,3-葡聚糖多糖可以作为“一体式”模板，具有还原、一维排列和融合金纳米颗粒的三种作用。此外，我们还发现了一个有趣的现象，即被阳离子β-1,3-葡聚糖多糖包覆的金纳米带对在金纳米带表面组织的阴离子卟啉通过静电相互作用表现出独特的表面增强拉曼散射。
We report the development of a new templating molecule designed by the modification of a helix-forming β-1,3-glucan polysaccharide to the cationic semiartificial one and its application to the fabrication of one-dimensional (1D) gold nanostructures by simple photoirradiation. Transmission electron microscopy observation showed that Au(III) ions are primarily reduced to gold nanoparticles self-assembling into the 1D array with the aid of the cationic β-1,3-glucan polysaccharide, which gradually fuse into the 1D gold nanostructure with the tapelike structure. The gold nanotape structure could not be created by neutral β-1,3-glucan polysaccharides or random coil synthetic cationic polymers. These findings consistently support the view that Au(III) ions are reduced by unmodified OH groups to gold nanoparticles under the photoirradiation, which are wrapped in the helical structure of the cationic β-1,3-glucan polysaccharide and eventually fuse into gold nanotapes. One may regard, therefore, that this cationic β-1,3-glucan polysaccharide can act as an "all-in-one" template playing three roles of reduction, 1D arrangement, and fusion of gold nanoparticles. In addition, we found an interesting phenomenon that the obtained gold nanotapes coated with cationic β-1,3-glucan polysaccharides show unique surface-enhanced Raman scattering for anionic porphyrines organized on the surface of gold nanotapes through the electrostatic interaction.