Magnetochromatic Polydiacetylene by Incorporation of Fe3O4 Nanoparticles
Magnetochromatic Polydiacetylene by Incorporation of Fe3O4 Nanoparticles
复制标题
掺入 Fe3O4 纳米颗粒的磁致变色聚二乙炔
DOI：
10.1002/anie.201100064
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发表时间：
2011-01-01
影响因子：
16.6
通讯作者：
Peng, Huisheng
中科院分区：
文献类型：
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作者：
Chen, Xuli;Li, Li;Peng, Huisheng
共轭聚合物已被探索用于广泛的应用，特别是在光电和传感材料中，因为主链中的 π 电子离域为它们提供了有趣的电子和光学特性。 [1]例如，聚二乙炔 (PDA) 表现出强烈的色变，通常从蓝色到红色，以响应各种外部刺激，例如温度、pH、离子、溶剂和配体相互作用。[1-11] 这种色度变化可以很容易地被肉眼察觉，使 PDA 成为传感应用的理想选择。 PDA 的颜色变化是由于聚合物主链在刺激下构象发生变化而导致 PDA 有效缀合长度缩短而引起的。为了改善其实际应用，人们对探索具有新传感功能的 PDA 产生了广泛的兴趣。例如，Peng [12-14] 和 Zou [15, 16] 团队最近分别发现了电子和光诱导的 PDA/碳纳米管纤维和 PDA/偶氮苯纳米材料。常见且关键的策略是通过引入具有专门设计的结构和功能的第二相来形成纳米复合材料。然而，据我们所知，PDA 中尚未实现磁致色差。然而，磁致变色PDA材料对于从小型设备到飞机的许多应用来说都是有利的，因为它们制造成本低、结构简单、灵敏度高、操作方便和安全。制造磁致变色PDA系统的一种可能方法是引入其他纳米材料，这些纳米材料在暴露于磁场时可以诱导PDA构象变化。近年来，氧化铁纳米颗粒因其超顺磁特性而被广泛研究，是满足这一要求的理想候选者之一。[17-20]在此，我们首先将 Fe3O4 纳米颗粒掺入 PDA 中，以生产高质量的复合材料，通过现成的、高效的自组装过程在交流磁场中改变颜色。合成流程如图1所示。首先将二乙炔单体连接到
Conjugated polymers have been explored for a broad spectrum of applications, particularly in optoelectronic and sensing materials, because the π-electron delocalization in the backbones provides them with intriguing electronic and optical properties.[1] For example, polydiacetylene (PDA) exhibits an intense chromatic transition, typically from blue to red, in response to various external stimuli, such as temperature, pH, ion, solvent, and ligand interaction.[1–11] This colorimetric change can be easily perceived by the naked eye, making PDA an ideal candidate for sensing applications. The color changes of PDAs are caused by the shortening of the effective PDA conjugation length as a result of changes in the conformation of the polymer backbone under stimuli. To improve their practical applications, increasing interest has been extensively attracted to explore PDAs with new sensing functionalities. For example, electron-and light-induced PDA/carbon nanotube fibers and PDA/azobenzene nanomaterials were recently discovered by the groups of Peng [12–14] and Zou,[15, 16] respectively. The common and critical strategy is to form nanocomposites by introducing the second phases with specifically designed structures and functionalities. However, to the best of our knowledge, no magnetisminduced chromatism has ever been realized in PDA. However, magnetochromatic PDA materials could be advantageous for many applications ranging from small devices to aircraft as they are low-cost in fabrication, simple in structure, high-efficiency in sensitivity, and convenient and safe in operation.A possible approach to fabricate magnetochromatic PDA systems is to introduce other nanomaterials that may induce PDA conformational changes upon exposure to a magnetic field. Iron oxide nanoparticles have been widely studied for their superparamagnetic properties in recent years and represent one of the ideal candidates to meet this requirement.[17–20] Herein, we first incorporated Fe3O4 nanoparticles into PDA to produce high-quality composites that change colors in AC magnetic field through a ready and efficient selfassembly process. The synthetic procedures are shown in Figure 1. Diacetylenic monomers are first connected to the