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Nanoscale Shuffling in a Template-Assisted Self-Assembly of Binary Colloidal Particles

Title
Nanoscale Shuffling in a Template-Assisted Self-Assembly of Binary Colloidal Particles
Author
이승백
Keywords
Colloidal particles; Improved FIPS 140-2; Nanoscale shuffling; Random number generator; Template-assisted self-assembly
Issue Date
2012-03
Publisher
Amer Scientific Publishers
Citation
Journal of Nanoscience and Nanotechnology, 2012, 12(3), P.2934-2938
Abstract
We have fabricated a square lattice array of sub-micrometer fluorescent (red and green) polystyrene particles. The particles were each embedded into small pits fabricated on a silicon substrate by electron beam lithography, through the drying process of an aqueous suspension containing equal amounts of the two species. We indexed 0 and 1 for each red and green particle, respectively, and then obtained a one-dimensional bit sequence by the successive reading of the indices in a predetermined manner. We evaluated the randomness of the bit sequence by using the improved FIPS 140-2 statistical test suite. Consequently, we found that the bit sequences do not have any non-randomness. The particle array was obtained by a very simple process, i.e., the drying of a suspension, but the particle distribution pattern was definitely unpredictable and irreproducible, and the number of possible patterns was tremendously large. The signal-i.e., the color of the particle does not deteriorate within a practical timescale under various conditions, such as in an electric field, in a magnetic field, in air or water, on a solid matrix, and so on, which means that a small tip with the particle pattern can be installed in miscellaneous object, including electronic products, plastic credit cards, currency bills, and so on. Therefore, this particle array is applicable to a nanoscale identification tag or a one-time pad encryption tip.
URI
http://www.ingentaconnect.com/content/asp/jnn/2012/00000012/00000003/art00172;jsessionid=ikug2219nukd.x-ic-live-03http://repository.hanyang.ac.kr/handle/20.500.11754/72989
ISSN
1533-4880
DOI
10.1166/jnn.2012.5829
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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