Phototriggered micromanufacturing using photoresponsive amorphous spirooxazine films
作者:Takashi Ubukata、Shohei Fujii、Kento Arimatsu、Yasushi Yokoyama
DOI:10.1039/c2jm32149a
日期:——
In this study, a series of spirooxazine molecules possessing bulky substituents was synthesized. These molecules readily formed amorphous glasses and their glass transition temperatures increased with the bulkiness of substitution. Their amorphous thin films exhibited apparent photochromism due to the spirooxazine–merocyanine isomerism and high durability to UV light in a nitrogen atmosphere. When the amorphous spirooxazine films were irradiated with spatially patterned UV light, surface relief gratings were produced because of the lateral material transfer from the shaded areas to the irradiated areas around their glass transition temperatures. Surface relief structure growth rate has a good relationship with the amount of photogenerated merocyanine formed at the irradiated area. A mechanism based on the diffusion of the spiro form for surface relief formation in this system has been proposed.
在这项研究中,科研人员合成了一系列带有大体积取代基的螺恶唑啉分子。这些分子容易形成无定形玻璃,且它们的玻璃化转变温度随着取代基体积的增大而升高。在氮气氛围下,这些分子的无定形薄膜由于螺恶唑啉-甲罗花青异构化而表现出明显的光致变色性,并且对紫外光具有较高的耐久性。当无定形螺恶唑啉薄膜在接近其玻璃化转变温度时受到空间图案化的紫外光照射,由于材料从未受光照区域向受光照区域的横向迁移,形成了表面浮雕光栅。表面浮雕结构的生长速率与受光照区域形成的光生甲罗花青的量有很好的相关性。研究人员提出了一个基于螺形异构体扩散的表面浮雕形成机制来解释这个体系。