In this study, we have proposed a simple method to produce temperature-dependent variablesize of MoS2 nanodots (NDTs) by using MoS2 powder as a pre-cursor and KNa-tartrate as the intercalant. Due to defects in MoS2, the optical properties are strongly modified and show blue luminescence under UV irradiation of MoS2 NDTs. The temperature variable is used to gradually introduce defects in 2D materials to obtain nanodots with different particle sizes. When the synthesis temperature is increased from 120 °C to 200 °C, the particle size is reduced from ~ 120 nm to ~ 2.5 nm. Next, an enhancement of photoluminescent magnitude and a red shift were observed in photoluminescence spectra from MoS2 NDTs solutions. These results offer a route toward tailoring the optical properties of 2D nanomaterials by controlling the size/temperature/synthesis method.

中文翻译：

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嵌入剂和温度对混合二硫化钼纳米点制备及其光致发光增强的影响

在这项研究中，我们提出了一种简单的方法，通过使用 MoS2 粉末作为前体和酒石酸 KNa 作为嵌入剂来生产随温度变化的 MoS2 纳米点 (NDT)。由于二硫化钼中的缺陷，在二硫化钼无损检测的紫外光照射下，其光学性质发生了强烈的改变并显示出蓝色发光。温度变量用于在二维材料中逐渐引入缺陷，以获得不同粒径的纳米点。当合成温度从 120 °C 增加到 200 °C 时，粒径从 ~ 120 nm 减小到 ~ 2.5 nm。接下来，在来自 MoS2 NDTs 溶液的光致发光光谱中观察到光致发光幅度的增强和红移。这些结果为通过控制尺寸/温度/合成方法来定制二维纳米材料的光学特性提供了途径。