胶态相变材料：单分散GeTe纳米粒子的合成及其尺寸依赖性结晶的量化。,Chemistry of Materials

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胶态相变材料：单分散GeTe纳米粒子的合成及其尺寸依赖性结晶的量化。
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-08-20 , DOI: 10.1021/acs.chemmater.8b02702
Olesya Yarema ₁ , Aleksandr Perevedentsev ₂ , Vladimir Ovuka ₁ , Paul Baade ₁ , Sebastian Volk ₁ , Vanessa Wood ₁ , Maksym Yarema ₁

Affiliation

相变存储材料是指可以存在于具有明显不同的电学或光学特性的非晶相和结晶相中，并具有出色的结晶动力学和最佳相变温度的一类材料。本文着重于胶体作为相变存储材料的潜力。我们报告了一种基于酰胺促进方法的无定形GeTe纳米粒子的新型合成方法，该方法能够精确控制4至9 nm之间的GeTe纳米粒子的尺寸，窄尺寸分布可低至9-10％，并且合成规模扩大，可达到每批次多克化学收率。然后，我们使用高温X射线衍射，差示扫描量热法和透射电子显微镜对GeTe纳米粒子的结晶相变进行了量化。我们显示，GeTe纳米颗粒比整体GeTe材料在更高的温度下结晶，并且结晶温度随着尺寸的减小而增加。我们可以使用结晶模型的熵和经典成核理论来解释这种尺寸依赖性。此处量化的大小相关性突出了纳米粒子在相变存储应用中可能带来的好处。

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Colloidal Phase-Change Materials: Synthesis of Monodisperse GeTe Nanoparticles and Quantification of Their Size-Dependent Crystallization.

Phase-change memory materials refer to a class of materials that can exist in amorphous and crystalline phases with distinctly different electrical or optical properties, as well as exhibit outstanding crystallization kinetics and optimal phase transition temperatures. This paper focuses on the potential of colloids as phase-change memory materials. We report a novel synthesis for amorphous GeTe nanoparticles based on an amide-promoted approach that enables accurate size control of GeTe nanoparticles between 4 and 9 nm, narrow size distributions down to 9-10%, and synthesis upscaling to reach multigram chemical yields per batch. We then quantify the crystallization phase transition for GeTe nanoparticles, employing high-temperature X-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. We show that GeTe nanoparticles crystallize at higher temperatures than the bulk GeTe material and that crystallization temperature increases with decreasing size. We can explain this size-dependence using the entropy of crystallization model and classical nucleation theory. The size-dependences quantified here highlight possible benefits of nanoparticles for phase-change memory applications.

更新日期：2018-08-20

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