Reaction induced morphology changes of tetracene and pentacene surfaces.
Reaction induced morphology changes of tetracene and pentacene surfaces.
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DOI：
10.1039/c9ra05682c
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发表时间：
2019-08-23
期刊：
影响因子：
3.9
通讯作者：
Ciszek, Jacob W.
中科院分区：
文献类型：
--
作者：
Li, Feifei;Ciszek, Jacob W.
形态在决定固态分子材料的性质方面起着关键作用，但随着这些材料进行反应，形态波动很大。一个原型系统，并四苯和并五苯薄膜的气-固Diels-Alder反应，被用来观察从表面到散装的反应过渡的形态特征的演变。通过原子力显微镜（AFM）和扫描电子显微镜（SEM）测量，反应的初始阶段显示出很小的形貌变化，并且通过能量色散X射线（EDX）光谱法测定，基材涂覆有1-2个分子厚的产物的均匀层。后期反应的高度纹理化表面是聚集产物的结果，如通过EDX光谱和偏振调制红外反射吸收光谱（PM-IRRAS）所鉴定的;产物聚集体之间的表面区域类似于初始阶段。产品聚集成表面粗糙体的机制需要促进介质的帮助-在这种情况下是冷凝蒸汽;简单的热辅助表面扩散无法产生这些形态变化。综合数据表明，在没有气相反应物冷凝物的情况下，分子固体的反应可以被限制在表面。形态在决定固态分子材料的性质方面起着关键作用，这需要更好地理解其在反应条件下的演变。
Morphology plays a critical role in determining the properties of solid-state molecular materials, yet fluctuates wildly as these materials undergo reaction. A prototypical system, a vapor–solid Diels–Alder reaction of tetracene and pentacene thin-films, is used to observe the evolution of morphology features as the reaction transitions from surface to bulk. The initial stages of reaction display little topographical change as measured by atomic force microscopy (AFM) and scanning electron microscopy (SEM), and substrates are coated with a uniform layer of product 1–2 molecules thick, as determined by energy-dispersive X-ray (EDX) spectroscopy. The highly textured surfaces of late stage reactions are a result of aggregated products, as identified via EDX spectroscopy and polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS); areas of the surface in between product aggregates resemble the initial stages. The mechanism by which products aggregate into surface asperities requires the assistance of a facilitating media – in this case condensed vapor; simple thermally assisted surface diffusion was unable to generate these morphology changes. The combined data indicate that reactions of molecular solids, could be confined to the surface in the absence of condensate of the vapor phase reactant. Morphology plays a critical role in determining the properties of solid-state molecular materials, which necessitates a better understanding of its evolution when exposed to reactive conditions.
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