Photo-illumination hardening of fullerene crystals

我们已经完成了维克斯C60和C70晶体的微观硬度实验。根据结果，我们发现C60和C70晶体的微硬度在它们被白光照亮后增加。我们称之为“Photo-illumination hardening”。结果如下：1。这种困难增加了时间的亮度，然后方法具有一个恒定的价值。它的硬度取决于特定温度，并在温度高于400 K。它的强度强烈依赖于光的波长的发光。The magnitude of the hardness reaches a maximum at 700 nm. 4. C60晶体的拉曼峰，其亮度是照明时间的一个函数，从1469厘米的内在峰D1- 1到1460厘米的光聚合峰D1 - 1通过1465厘米的D1 - 1和1464厘米的D1-1的D1和1464厘米的D1-1的D1.5。在C70水晶的情况下，我们也观察到了同样的行为类型，用于摄影照明。此外，照明需要更长的时间，从这些结果来看，我们将硬化归结为C60或C70的光诱导聚合物。

We carried out the experiments of Vickers micro-hardness of C60 and C70 crystals. As results, we have found that the micro-hardness of C60 and C70 crystals increased after they are illuminated with white light. We call this phenomenon "Photo-illumination hardening". The results are as following,1. The hardness increases with illumination of time, and then approaches a constant value.2. The hardening depends on the specimen temperature, and disappears at temperatures higher than 400K.3. The hardness strongly depends on the wavelength of illumination of light. The magnitude of the hardness reaches a maximum at 700nm.4. The Raman peaks of C60 crystals, which were illuminated as a function of illumination time, shift from an intrinsic peak 1469cmィイD1-1ィエD1 to a photo-polymerized peak 1460 cmィイD1-1ィエD1 via 1465 cmィイD1-1ィエD1 and 1464 cmィイD1-1ィエD1.5. In case of C70 crystals, we also observed the same kinds of behaviors due to photo-illumination. although the illumination time needs more longer.From these results, we conclude the hardening is due to the photo-induced polymers of C60 or C70.