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While the examples so far all involve LSPR-based sensing of molecules, other changes can also be detected via LSPR techniques. Recently, the structural changes of a nanoparticle, typically associated with aging and minimization of its surface energy, have been used to develop a novel class of colorimetric indicators for time and the average temperature over extended time frames.For example, the sharp corners of triangular Ag nanoplates in solution will round and become truncated over time, resulting in a large shift in the LSPR. This rounding process was found to be sensitive to temperature. At higher temperatures, the rounding process proceeded faster. These variables (time and temperature) could be calibrated to the LSPR shift of the Ag nanoplates. The color change that accompanies this rounding can be seen with the naked eye, making this new system well suited as time and temperature indicators. When placed on the outside of a product¡¯s packing, the time and temperature information about the product can be easily determined. |
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zhulty: ½ð±Ò+15, ·ÒëEPI+1 2012-04-04 11:26:33
zhulty: ½ð±Ò+15, ·ÒëEPI+1 2012-04-04 11:26:33
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