Synthesis of dendron-protected porphyrin wires and preparation of a one-dimensional assembly of gold nanoparticles chemically linked to the π-conjugated wires
Synthesis of dendron-protected porphyrin wires and preparation of a one-dimensional assembly of gold nanoparticles chemically linked to the π-conjugated wires
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DOI：
10.1021/la0634544
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发表时间：
2007-05-22
期刊：
影响因子：
3.9
通讯作者：
Ogawa, Takuji
中科院分区：
文献类型：
--
作者：
Ozawa, Hiroaki;Kawao, Masahiro;Ogawa, Takuji
通过以下方法在化学改性玻璃表面和未掺杂的自然氧化硅表面上制备化学键合到π共轭卟啉聚合物的一维金纳米粒子组装体：通过5,15-二乙炔基-10,20-双-((4-dendron)苯基)的氧化偶联制备π-共轭卟啉聚合物。 通过分析凝胶渗透色谱 (GPC) 收集卟啉 (6) 及其同系物（大于 40 聚体）。使用 Langmuir-Blodgett (LB) 方法将卟啉聚合物（> 40-mer）沉积在基材表面上，然后将其浸泡在用叔十二烷硫醇和 4-吡啶乙硫醇保护的金纳米颗粒（2.7 +/- 0.8 nm）溶液中。通过敲击模式原子力显微镜 (AFM) 观察到的表面形貌图像表明，聚合物可以分散在两种基材上，改性玻璃上的高度为 2.8 +/- 0.5 nm，硅上的高度为 3.1 +/- 0.5 nm。浸泡在金纳米粒子溶液中后，高度明显增加，玻璃上的高度为 5.3 +/- 0.5 nm，硅上的高度为 5.4 +/- 0.7 nm。高度差异（玻璃上为 2.5 nm，硅上为 2.3 nm）对应于与卟啉聚合物结合的金纳米颗粒的直径。在扫描电子显微镜图像中观察到的金纳米颗粒之间的距离约为。 5 nm，表明它们每四个或五个卟啉单元键合。
A one-dimensional assembly of gold nanoparticles chemically bonded to pi-conjugated porphyrin polymers was prepared on a chemically modified glass surface and on an undoped naturally oxidized silicon surface by the following methods: pi-conjugated porphyrin polymers were prepared by oxidative coupling of 5,15-diethynyl-10,20-bis-((4-dendron)phenyl) porphyrin (6), and its homologues (larger than 40-mer) were collected by analytical gel permeation chromatography (GPC). The porphyrin polymers (> 40-mer) were deposited using the Langmuir-Blodgett (LB) method on substrate surfaces, which were then soaked in a solution of gold nanoparticles (2.7 +/- 0.8 nm) protected with t-dodecanethiol and 4-pyridineethanethiol. The topographical images of the surface observed by tapping mode atomic force microscopy (AFM) showed that the polymers could be dispersed on both substrates, with a height of 2.8 +/- 0.5 nm on the modified glass and 3.1 +/- 0.5 nm on silicon. The height clearly increased after soaking in the gold nanoparticle solution, to 5.3 +/- 0.5 nm on glass and 5.4 +/- 0.7 nm on silicon. The differences in height (2.5 nm on glass and 2.3 nm on silicon) corresponded to the diameter of the gold nanoparticles bonded to the porphyrin polymers. The distance between gold nanoparticles observed in scanning electron microscopic images was ca. 5 nm, indicating that they were bonded at every four or five porphyrin units.