Luminescent Lead Halide Perovskite NCs (CsPbX3, X = Br, I) for the Detection of Nitro-Organic Explosives

IF 5.5 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Nano Materials Pub Date : 2025-07-09 DOI:10.1021/acsanm.5c02327

Shashikana Paria, and , Prasenjit Maity*,

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Abstract

The present work reveals the experimental observation of fascinating exciton and electron interactions between cesium lead halide (CsPbX₃ (X= I, Br)) perovskite nanocrystals (LHP NCs) and nitro-explosives (such as PETN, RDX, TNT, DNT, and NT). The weakly bound Pb–I and weak electronegativity of iodine as compared to the bromine counterpart in CsPbI₃ strongly interact with the nitro-group of the explosives accompanied by the visually striking color change in the excitonic emission, observable with the naked eye. The interaction leads to the progressive blue shifting in the fluorescence emission and formation of nonemitting dark states with increasing nitro-explosive concentration. In contrast, CsPbBr₃ exhibits weak fluorescence quenching with red-shifting in the fluorescence peak as the explosive concentration increases. Further, the mix-halide perovskites CsPb(I/Br)₃ exhibit dynamic wide-band color transitions from orange to green with rapid quenching of the emission behavior. These unique photophysical properties underline the remarkable potential of CsPbX₃ (X = I, Br) perovskites as sensitive and visually distinct fluorescence markers for nitro-explosive detection.

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发光卤化铅钙钛矿NCs （CsPbX3, X = Br， I）探测有机硝基炸药

本研究揭示了卤化铯铅（CsPbX3 (X= I, Br)）钙钛矿纳米晶体（LHP NCs）与硝基炸药（如PETN， RDX， TNT， DNT和NT）之间令人着迷的激子和电子相互作用的实验观察。与CsPbI3中的溴相比较，弱结合的Pb-I和碘的弱电负性与炸药的硝基强烈相互作用，并伴随着肉眼可见的激子发射中明显的颜色变化。随着硝基炸药浓度的增加，这种相互作用导致荧光发射逐渐蓝移，并形成不发射的暗态。而CsPbBr3则表现出微弱的荧光猝灭，荧光峰随着爆炸浓度的增加而发生红移。此外，混合卤化物钙钛矿CsPb(I/Br)3表现出从橙色到绿色的动态宽带颜色转变，并具有快速猝灭的发射行为。这些独特的光物理性质强调了CsPbX3 （X = I, Br）钙钛矿作为检测硝基炸药的灵敏和视觉上独特的荧光标记物的显着潜力。

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来源期刊

ACS Applied Nano Materials Multiple-

CiteScore

8.30

自引率

3.40%

发文量

1601

期刊介绍： ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.