Path-Dependent Morphological Evolution of Se–Te Mesostructures Prepared by Inorganic Phototropic Growth,Journal of the American Chemical Society

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Path-Dependent Morphological Evolution of Se–Te Mesostructures Prepared by Inorganic Phototropic Growth
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-11-11 , DOI: 10.1021/jacs.0c09798
Kathryn R. Hamann ₁ , Azhar I. Carim ₁ , Madeline C. Meier ₁ , Nathan S. Lewis ₁

Affiliation

We describe herein a path-dependent "history" effect wherein the film morphology generated in the second step of a two-step inorganic phototropic growth process depends on a preexisting structure that has been first grown under different optical stimulation conditions. Se-Te generated with static illumination exhibited a highly anisotropic lamellar morphology with a characteristic feature pitch proportional to the input wavelength. Growth using first a short wavelength of light, followed by growth using a longer wavelength, resulted in the second-stage morphology exhibiting termination of lamellae formed during the first growth step. The lamellar pitch at the end of the second growth step was larger than that effected in the first step. In contrast, use of the same input wavelengths but in the opposite order produced no change in the feature pitch but rather only linear feature extension. Analysis of light absorption in simulated structures, in tandem with the empirical data, indicated that the history effect and asymmetric path dependence are a result of emergent nanophotonic processes at the growth interface that dynamically shape the optical field and direct morphological evolution of the photodeposit in a continuous feedback loop.

中文翻译：

无机向光生长制备的 Se-Te 细观结构的路径依赖形态演化

我们在此描述了一种依赖于路径的“历史”效应，其中在两步无机光致生长过程的第二步中生成的膜形态取决于在不同光刺激条件下首先生长的预先存在的结构。用静态照明生成的 Se-Te 表现出高度各向异性的层状形态，其特征间距与输入波长成正比。首先使用短波长的光生长，然后使用较长波长的光生长，导致第二阶段形态表现出在第一生长步骤期间形成的薄片的终止。在第二个生长步骤结束时的层状间距大于在第一步中产生的间距。相比之下，使用相同的输入波长但以相反的顺序不会产生特征间距的变化，而只会产生线性特征扩展。模拟结构中的光吸收分析与经验数据相结合，表明历史效应和不对称路径依赖性是生长界面处出现的纳米光子过程的结果，这些过程动态地塑造了光场并直接形成了光沉积物的形态演化。持续反馈循环。

更新日期：2020-11-11

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