DETECTION METHOD AND SENSOR BASED ON INTERPARTICLE DISTANCE

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The present invention relates to a method for determining the presence or amount of a compound in a sample by interparticle distance-dependent sensing, comprising : (a) contacting the sample suspected of containing the compound with rare earth doped metal oxide nanoparticles; and(b) detecting the compound by determining the change in luminescent properties of the rare earth doped metal oxide nanoparticles upon contact with the sample.