Key Laboratory of Medicinal Chemistry for Natural Resource-Ministry of Education, School of Chemical Science and Technology, Yunnan University, 2 North Cuihu Road, Kunming 650091, People's Republic of China.
School of Materials Science and Engineering, Yunnan University, 2 North Cuihu Road, Kunming 650091, People's Republic of China.
Nanotechnology. 2021 Jun 22;32(37). doi: 10.1088/1361-6528/ac05ec.
Fingerprints formed by the raised papillary ridges are one of the most important markers for individual identification. However, the current visualization methods for latent fingerprints (LFPs) suffer from poor resolution, low contrast, and high toxicity. In this work, the CsPbBr/CsPbBrnanostructured composite crystal (CsPbBr/CsPbBrNCC) were synthesized via a simple chemical solvent-assisted method. Compared with conventional perovskites, the as-prepared CsPbBr/CsPbBrNCC present an outstanding long-term environmental and water stability with 42% and 80% photoluminescence intensity remaining after 28 d under water and air conditions, respectively. Moreover, a special response to biomolecules from fingerprints was observed due to the hydrophobic interactions between the CsPbBr/CsPbBrNCC surface hydrophobic ligands (oleyl amine and oleic acid) and the hydrophobic groups in the biomolecules from the human fingers. Clear LFPs images were visualized in a bright environment illuminating the prepared CsPbBr/CsPbBrNCC powder under UV light of wavelength 365 nm. The images were also obtained on porous and non-porous surfaces such as metal, plastic, wood, glass, and paper products. These perovskite nanocrystals are expected a stable and bright luminescent labeling agent for LFPs visualization and have potential application in crime scene and personal identifications.
指纹的脊线凸起是个体识别的最重要标记之一。然而，目前潜伏指纹（LFPs）的可视化方法存在分辨率差、对比度低和毒性高的问题。在这项工作中，通过简单的化学溶剂辅助法合成了 CsPbBr/CsPbBr 纳米结构复合晶体（CsPbBr/CsPbBrNCC）。与传统的钙钛矿相比，所制备的 CsPbBr/CsPbBrNCC 具有出色的长期环境和水稳定性，在水和空气条件下分别保持 28 天后，其光致发光强度分别保持 42%和 80%。此外，由于 CsPbBr/CsPbBrNCC 表面疏水性配体（油胺和油酸）与来自人手指的生物分子中的疏水分子之间的疏水相互作用，观察到对生物分子的特殊响应，来自指纹的生物分子。在波长为 365nm 的紫外光下，清晰的 LFPs 图像在明亮的环境下被可视化，该环境照亮了制备的 CsPbBr/CsPbBrNCC 粉末。在金属、塑料、木材、玻璃和纸制品等多孔和非多孔表面上也获得了图像。这些钙钛矿纳米晶体有望成为 LFPs 可视化的稳定且明亮的发光标记物，并在犯罪现场和个人识别方面具有潜在的应用。
