聚合物体系中热致可切换的单壁碳纳米管一维和二维阵列。
Thermally switchable one- and two-dimensional arrays of single-walled carbon nanotubes in a polymeric system.
机构信息
Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.
出版信息
J Am Chem Soc. 2009 Nov 18;131(45):16568-72. doi: 10.1021/ja9073479.
Fabrication of highly ordered arrays of single-walled carbon nanotubes (SWNTs) has been of great interest for a wide range of potential applications. Here, we report thermally switchable one- and two-dimensional arrays of individually isolated SWNTs formed by cooperative self-assembly of functionalized SWNTs and a block copolymer/water system. Small-angle X-ray scattering measurements reveal that when the block copolymer/water system is in an isotropic phase, two-dimensional hexagonal arrays of SWNTs are formed by depletion attraction, and when the block copolymer/water system is in a lamellar phase, one-dimensional lattices of SWNTs intercalated in the polar regions of the polymeric lamellar structure are formed by entropically driven segregation and two-dimensional depletion attraction. These two SWNT arrays are thermally interchangeable, following the temperature-dependent phase behavior of the block copolymer/water system.
制备高度有序的单壁碳纳米管（SWNTs）阵列对于广泛的潜在应用具有重要意义。在这里，我们报告了通过功能化 SWNTs 和嵌段共聚物/水体系的协同自组装形成的热可切换的单维和二维孤立 SWNTs 阵列。小角 X 射线散射测量表明，当嵌段共聚物/水体系处于各向同性相时，通过耗散吸引力形成二维六方 SWNTs 阵列，当嵌段共聚物/水体系处于层状相时，通过熵驱动的分离和二维耗散吸引力形成一维 SWNTs 晶格插入聚合物层状结构的极性区域。这两种 SWNT 阵列是热可互换的，这取决于嵌段共聚物/水体系的温度依赖性相行为。
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