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Materials for data storage

a technology of data storage and materials, applied in the direction of instruments, conductors, record carrier materials, etc., can solve the problems of loss of emission, change in the optical properties of materials, and formation of mesoporous materials, and achieve the effects of high resolution, positive contrast, and extraordinary photostability of oligo-atomics

Inactive Publication Date: 2009-08-20
KATHOLIEKE UNIV LEUVEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]A particular advantage of the present invention is not only that the printed or coated images can comprise optical information as such which is invisible under ambient conditions but that additional optical information can be added to or written in the image, for instance, by defined UV radiation.
[0022]A further particular advantage of the present invention is the extraordinary photostability of the oligo-atomic metal clusters in molecular sieve crystals for multiplex (bio)assay applications over the organic dye-loaded latex spheres used in the photobleaching-based method.
[0023]An additional particular advantage of the present invention is the high resolution obtained with 2-photon activation of the oligo-atomic metal clusters in molecular sieve crystals for multiplex (bio)assay applications allowing for the creation of several layers of advanced matrix codes such as the 2D MaxiCodes and QR-codes inside an individual molecular sieve crystal.
[0024]An additional particular advantage over the photobleaching approach in respect of multiplex (bio)assay applications is that, since a dark pattern is written in a big fluorescent volume, the activated patterns have a positive contrast and are thus easily recognizable.
[0025]In accordance with the purpose of the invention, as embodied and broadly described herein, the invention is broadly drawn to data-storage material comprising an assembly of oligo-atomic clusters of metals confined in molecular sieves, preferably zeolites, for converting invisible radiation emitted by a radiation source at or above room temperature to visible light and for enhancing the emission intensity upon irradiation with UV or visible light.
[0026]Aspects of the present invention are realized by a method of storing data in oligo-atomic metal clusters confined in molecular sieves comprising the step of data-wise exposing said oligo-atomic metal clusters confined in molecular sieves to UV or visible light excitation, thereby providing stored data capable of being read as visible light emission upon exposure to UV-light or an electrical field at or above room temperature.

Problems solved by technology

For example, use of surfactants such as cetyltri-methylammonium bromide or dodecyltrimethylammonium bromide generally results in formation of mesoporous materials.
The major problem in the study and creation of small Au or Ag clusters is aggregation to large nanoparticles and eventually to bulk metal, with loss of emission.
This reduction causes a change in the optical properties of the material, however for such material the final outcome of the reduction reaction is hard to control and finally big non-emissive silver aggregates will have formed.
Generally this code is determined by the incorporation of different fluorescent tags in specific concentration ratios (optical encoding), and thus only a limited amount of unique codes is available.

Method used

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  • Materials for data storage
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Examples

Experimental program
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Effect test

example 1

Preparation and Methods

[0141]Various methods for the production of metal ion exchanged molecular sieves are available in the art. A method similar to that described by Jacobs et al. (Jacobs, P. A. & Uytterhoeven, J. B., 1979, Journal of the Chemical Society-Faraday Transactions 175, 56-64) was used for incorporating silver ions in molecular sieves and creating silver clusters. However many parameters like loading percentage of the zeolites, exchange time, length of temperature treatment, initial, gradient and final temperature of the temperature treatment, presence of gasses during the temperature treatment (e.g. in vacuum, in presence of oxygen, in presence of oxygen and nitrogen, in presence of hydrogen, in presence of CO and / or CO2 gas) and the presence of moisture in the air influences the finally formed types of clusters, oxidation state of the clusters and distribution and polydispersity of the types of clusters formed.

[0142]A typical procedure goes as follows: Zeolite 3A (Uni...

example 2

Emission

[0143]It was demonstrated that metal ion clusters especially silver in confined molecular sieves have a distinct and tunable emission throughout the VIS and NIR part of the electromagnetic spectrum while they are all excitable in the UV region. Thanks to the host matrix the confined metal clusters are prevented from aggregation with each other to form bigger non-emissive nanoparticles. Also they can be shielded from the outside environment (e.g., oxygen) if required by adding a silicon coating around the molecular sieves.

example 3

Photoactivation of Individual Spots within an Individual Silver-Exchanged Zeolite Crystal

Writing Patterns Inside the Zeolite Crystals

[0144]By irradiation with picoseconds pulsed 375 nm laser light of selected spots inside a silver-exchanged zeolite crystal, synthesized as described in example 1, using a confocal microscope setup, highly emissive silver clusters are formed inside a diffraction limited area, induced by the applied excitation source, giving rise to a strongly enhanced fluorescence (up to 200 times) from these selected spots. Typical irradiation powers for activation are 10 to 10,000 W / cm2 for photoactivation, whereas irradiation times vary from a 10 seconds for 10,000 W / cm2 to 1200 seconds for irradiation at 10 W / cm2.

[0145]By scanning the sample using a lower power (0.1 to 10 W / cm2), the photoactivated areas are easily recognized by their bright emission without further photoactivation during the scanning process.

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Abstract

The present invention concerns a data storage material that comprises an assembly of oligo atomic metal clusters confined in molecular sieve for converting invisible radiation emitted by a radiation source at or above room temperature to visible light. By irradiation of specific patterns within this material with UV or visible light, the emission from these patterns is irreversibly enhanced.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS[0001]This application is a continuation-in-part of International Application No. PCT / BE2008 / 000052 filed Jul. 7, 2008, which claims the benefit of G.B. Application No. 0713250.9 filed Jul. 9, 2007, G.B. Application No. 0724442.9 filed Dec. 14, 2007, G.B. Application No. 0802265.9 filed Feb. 7, 2008, G.B. Application No. 0802400.2 filed Feb. 11, 2008 and G.B. Application No. 0803185.8 filed Feb. 21, 2008, which documents are all incorporated by reference.FIELD OF THE INVENTION[0002]The present invention concerns materials with data-storage capabilities comprising emissive material of confined metal oligo-atomic clusters in molecular sieves, such as zeolites.BACKGROUND OF THE INVENTION[0003]In recent years, expertise has been gained in the synthesis of zeolites with desired properties by the choice of the structure directing agent (SDA), control of the synthesis conditions, and post-synthesis treatments [see van Bekkum, H. et al. (editors...

Claims

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Application Information

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IPC IPC(8): G06K19/02C09D1/02C08K3/08G11B7/243
CPCC09K11/02H01J61/44G06K19/06046C09K11/58Y02E10/52
Inventor DE CREMER, GERTDE VOS, DIRKHOFKENS, JOHANROEFFAERS, MAARTENSELS, BERTVOSCH, TOMPANDEY, LESLEY
Owner KATHOLIEKE UNIV LEUVEN
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