Radially oriented cellulose triacetate chains on gold nanoparticles
Radially oriented cellulose triacetate chains on gold nanoparticles
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DOI：
10.1007/s10570-010-9437-3
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发表时间：
2010-10-01
期刊：
影响因子：
5.7
通讯作者：
Takano, Toshiyuki
中科院分区：
文献类型：
--
作者：
Enomoto-Rogers, Yukiko;Kamitakahara, Hiroshi;Takano, Toshiyuki
制备了在还原末端具有二硫基的三乙酸纤维素（CTA）衍生物（CTA 2S、CTA 13S、CTA 41S），其数均聚合度（DP（n）s）分别为2、13和41。通过CTAS还原金盐（HAuCl 4）得到了CTA自组装金纳米粒子（CTA 2Au、CTA 13Au和CTA 41Au）。通过透射电子显微镜（TEM）观察分析金核的直径（d）和颗粒间距离（L）。CTA 2Au、CTA 13Au和CTA 41Au的d值分别为8.7、7.9和13.4nm。CTA2Au、CTA13Au和CTA41Au的L值分别为2.8、6.3和20.9nm，与CTAS链的分子长度（l）（CTA2S、CTA13S和CTA41S的ls分别为2.0、7.5和21.5nm）一致。通过动态光散射（DLS）测量的CTAAu纳米颗粒在氯仿溶液中的流体动力学直径（D）大于d值，并且随着CTA链的分子长度的增加而增加。发现CTAS链在固态和溶液中均作为金纳米颗粒的优异稳定剂。CTA链的分子长度控制了金纳米颗粒的尺寸和排列。结果，在金纳米颗粒上成功地制备了径向取向的CTA链。
Cellulose triacetate (CTA) derivatives having a disulfide group at the reducing-end (CTA2S, CTA13S, CTA41S), with number average degrees of polymerization (DP(n)s) of 2, 13 and 41, respectively, were prepared. The CTA-self-assembled gold nanoparticles (CTA2Au, CTA13Au, and CTA41Au) were obtained through the reduction of gold salt (HAuCl4) with CTASs. The diameters (d) and the interparticle distances (L) of the gold cores were analyzed by transmission electron microscopy (TEM) observations. The d values of CTA2Au, CTA13Au, and CTA41Au, were 8.7, 7.9, and 13.4 nm respectively. The L values of CTA2Au, CTA13Au, and CTA41Au, were 2.8, 6.3, and 20.9 nm, respectively, and agreed well with the molecular length (l) of CTAS chains (ls of CTA2S, CTA13S, CTA41S = 2.0, 7.5, 21.5 nm, respectively). The hydrodynamic diameters (D) of CTAAu nanoparticles in chloroform solution, measured by dynamic light scattering (DLS), were larger than the d values and increased with the increase in the molecular length of the CTA chains. The CTAS chain was found to work as an excellent stabilizer of the gold nanoparticles in both solid state and solution. The molecular length of CTA chains controlled the size and the alignment of the gold nanoparticles. As a result, the radially oriented CTA chains on the gold nanoparticles were successfully prepared.