Miller F, Reichstein J, Mandel K (2022)
Publication Language: English
Publication Type: Journal article, Online publication
Publication year: 2022
Open Access Link: https://onlinelibrary.wiley.com/doi/full/10.1002/adom.202102520
Tracking and tracing of objects are of paramount importance for realizing a Circular Economy and can be achieved by incorporating micrometer-scaled luminescent identification (ID) taggants. While established systems are passive, displaying merely an ID feature, for monitoring a products’ life cycle, conscious taggants with stimuli-triggered switchable ID signals, e.g., to record a recycling step, are desired. Herein, micrometer-scaled hybrid inorganic–organic taggants with a temperature-triggered switchable luminescent ID are reported. They are produced by assembling eight different types of organic and inorganic nanoparticles (NPs) via a two-step spray-drying process into supraparticles (SPs) with a core–shell structure. This hierarchical structure and well-balanced mass-ratios of the utilized nanosized building blocks are key to controlling the occurring coupling effects within SPs, thus, to obtain the switchable ID functionality. Initially, the temperature-inert inorganic luminescent ID-level, located in the core, is concealed by a mutable organic ID-level, emitted by the shell. Upon specific heat treatment, the ID is switched by irreversible quenching of the organic ID-level, revealing the inorganic ID-level. Furthermore, both ID-levels are read out ratiometrically using the same excitation wavelength for their detection. Based on the SPs’ toolbox-like manufacturing, the ID signals are adjustable to yield the demanded code variety on both ID-levels.
APA:
Miller, F., Reichstein, J., & Mandel, K. (2022). Hybrid Inorganic–Organic Luminescent Supraparticle Taggants with Switchable Dual-Level ID. Advanced Optical Materials. https://doi.org/10.1002/adom.202102520
MLA:
Miller, Franziska, Jakob Reichstein, and Karl Mandel. "Hybrid Inorganic–Organic Luminescent Supraparticle Taggants with Switchable Dual-Level ID." Advanced Optical Materials (2022).
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