Core-shell materials have superior properties over their single-component counterparts, and thus how to develop a new type of core-shell structure deserves much hard work. Herein, a plasmon-dependent photophysical (PDPP) process was developed to prepare Au@Safranine T core-shell nanostructures with reversible properties, wherein Safranine T (ST) was at first adsorbed on the surface of negatively charged gold nanospheres (AuNSs) through the electrostatic attraction and then controllably deposited by adjusting plasmonic illumination. The whole PDPP process was monitored in real-time via dark field microscopy (DFM) imaging system, verifying that plasmon-dependent light-matter interaction occurs. The as-prepared Au@ST nanostructures were then successfully applied for a reversible process of edit and erase that was suitable for encryption application with nanosized precision. This research showed that the PDPP process has high promise for developing precise structures of new materials, particularly those through nanoprocessing and nanooperation.

核-壳材料比单组分材料具有更优越的性能，因此如何开发新型核-壳结构需要付出很多努力。在此，开发了一种等离子体依赖的光物理（PDPP）过程来制备具有可逆特性的Au@Safranine T核壳纳米结构，其中Safranine T（ST）首先通过吸附在带负电的金纳米球（AuNSs）的表面上静电吸引，然后通过调节等离子体照明可控地沉积。通过暗场显微镜 (DFM) 成像系统实时监控整个 PDPP 过程，验证是否发生了等离子体依赖性光-物质相互作用。然后，所制备的 Au@ST 纳米结构成功应用于可逆的编辑和擦除过程，适用于纳米级精度的加密应用。这项研究表明，PDPP 工艺对于开发新材料的精确结构具有很高的前景，特别是那些通过纳米加工和纳米操作的材料。