Abstract Cesiumlead-halide perovskite nanocrystals are an emerging class of materials which potentially have different applications due to the several physical properties they exhibit. These properties are strongly dependent on the elemental composition of the nanocrystals and, to date, only few methods are available for their chemical analysis, such as scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX). The present work aims at establishing a new, fast and simple method for the elemental analysis of cesium lead-halide perovskite nanocrystals exploiting total-reflection x-ray fluorescence (TXRF) spectroscopy. The method was validated using a synthetized set of samples and comparing the TXRF results with SEM-EDX data. The sample preparation consisted in suspending the perovskites in 2.0 ml of hexane and sampling 10 μl of the suspension for deposition on a preheated quartz carrier. The element recovery ranged between 82% and 118% for mixed-halide perovskites, while for single halide perovskites it improved to 86%–105%. The present method can be implemented and used also for the elemental characterization of other types of perovskite nanocrystals.

中文翻译：

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全反射 X 射线荧光光谱法对铯铅卤化钙钛矿纳米晶的化学分析

摘要 铯铅卤化物钙钛矿纳米晶体是一类新兴的材料，由于它们具有多种物理特性，因此可能具有不同的应用。这些特性在很大程度上取决于纳米晶体的元素组成，迄今为止，只有少数几种方法可用于其化学分析，例如扫描电子显微镜与能量色散 X 射线光谱 (SEM-EDX) 相结合。目前的工作旨在建立一种新的、快速和简单的方法，利用全反射 X 射线荧光 (TXRF) 光谱对铯铅卤化钙钛矿纳米晶体进行元素分析。该方法使用一组合成样品进行验证，并将 TXRF 结果与 SEM-EDX 数据进行比较。样品制备包括将钙钛矿悬浮在 2 中。0 ml 己烷和 10 μl 悬浮液取样，用于在预热的石英载体上沉积。混合卤化物钙钛矿的元素回收率在 82% 到 118% 之间，而单卤化物钙钛矿的元素回收率提高到 86% 到 105%。本方法也可以实施和用于其他类型钙钛矿纳米晶体的元素表征。