Repairs using light signals

Repairs using light signals
Design of a micron-scaled communicating supraparticle (CP), combing the functionalities of an ID taggant and a temperature recorder in one luminescent entity. The CP consists of three different luminescent nanoparticle types: blue fluorescent dye-doped polymer nanoparticles that act upon specific temperature exposure with a defined irreversible signal alteration and inorganic lanthanide-doped nanoparticles with green and red luminescence that can be assembled in desired weight ratios to yield distinguishable ID signals. Credit: University of Erlangen-Nuremberg

Repairing complex electrical appliances is time consuming and rarely cost-effective. The working group led by Prof. Dr. Karl Mandel, Professorship of Inorganic Chemistry at Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), has now developed a smart microparticle that enables defective components in these appliances to be identified more quickly and easily by using light signals. In the long-term, this could make repairs easier and extend the operating life of devices. The results have been published in the journal Advanced Functional Materials.

To identify defective components in a device, particles known as supraparticles are applied to the individual parts. These particles measure between one and ten micrometers and under black light they provide information about the component's identity and temperature history (the temperatures the specific component was recently subjected to) by emitting blue, green and red light. This allows the device to be checked for defects while it is still assembled. The signal ratio between building blocks emitting green and red light determines the identity of the component. The maximum temperature can be read from the signal ratio of blue and green particles. If a specific temperature limit is exceeded, the blue signal irreversibly loses intensity. An overheated and therefore usually damaged micro-component can be detected by the weaker blue light signal it emits. The developed particles make it easier and faster to repair complex electrical devices and extend their operating life.

The supraparticles themselves consist of organic and anorganic nanoparticle that communicate information only when they are combined. The structure and quantity ratios of the nanoparticles determine the identity signals and temperature sensitivity. By changing the composition of the smart microparticles, the sensitivity and the identity signal can be adapted to a specific product.

More information: Jakob Reichstein et al, Communicating Particles: Identification Taggant and Temperature Recorder in One Single Supraparticle, Advanced Functional Materials (2021). DOI: 10.1002/adfm.202104189

Journal information: Advanced Functional Materials

Citation: Repairs using light signals (2021, July 15) retrieved 25 September 2023 from
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