Development of thymine functionalized metal nanoparticles for light-induced ferromagnetic materials.

制备理想形式的纳米颗粒（NPs），特别是一维等高度各向异性的纳米颗粒，近年来在先进器件中受到了极大的关注。胸腺嘧啶衍生物（Thy）在270和220 nm不同波长的紫外照射下可逆形成二聚体。利用十二酚保护金纳米粒子（DT-AuNP）的配体交换反应，合成了胸腺嘧啶衍生物功能化金纳米粒子（Thy-AuNP）。紫外光（270 nm）照射THF溶液中的thyy - aunp，形成由胸腺嘧啶光二聚化组成的一维排列。透射电镜观察发现，排列的Thy- dt - aunps之间的距离与Thy衍生物的二聚体尺寸一致（3.6 nm）。因此，Thy配体被引入Au NPs的相反位置，正如2.6 nm尺寸的Au NPs所预期的那样。当220 nm的紫外照射到含有排列的Thy-DT-AuNPsThy的THF溶液时，1D有序消失。

Fabrication of nanoparticles (NPs) in a desired form, especially in a highly anisotropic form such as 1D, has receiving significant attention in recent years in relation to advanced devices. Thymine derivative (Thy), which forms dimer reversibly by UV irradiation with different wavelengths of 270 and 220 nm. The gold nanoparticles functionalized by thymine derivatives (Thy-AuNP) were synthesized by ligand exchange reaction of dodecanthiol protected gold nanoparticles (DT-AuNP). Irradiation of UV light (270 nm) to the Thy-AuNP in THF solution resulted in the formation of 1D arrangement comprising photodimerization of Thymine. TEM observation showed the distance between arranged Thy-DT-AuNPs coincides with the size of dimerized Thy derivative (3.6 nm). Thus, Thy ligands were introduced to opposite positions of Au NPs, as anticipated for Au NPs of 2.6 nm size. When UV with 220 nm was irradiated to THF solution containing arranged Thy-DT-AuNPsThy, 1D ordering disappeared.