Encoding and decoding nanoscale thermal barcodes for ultrahigh capacity identification systems

Zeyu Ma; Yan Hong; Minghui Zhang; Ming Su
December 2009
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p233101
Academic Journal
An ultrahigh capacity coding system is created based on the solid to liquid phase changes of a variety of nanoparticles, which are designed and prepared with sharp, discrete melting peaks and encapsulated inside nonmelting shells. A mixture of such thermally-active nanoparticles at designed ratio can be embedded inside an object as a nanoscale barcode that can be decoded by differential thermal scan. The coding capacity depends on the number of melting peaks, which in turn depends on nanoparticle compositions. A coding system with 50 different compositions can generate over 1015 thermal barcodes, sufficient for many identification applications.


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