We studied a blend of gold nanoparticles (AuNPs) and zinc phthalocyanines (ZnPcs). Noble metal nanoparticles (NMNPs) are known for excellent nonlinear absorption properties, superior to that of the best organic optical limiters such as fullerenes or phthalocyanines. However, NMNPs lose much of these properties after few intense laser pulses due to photoinduced fragmentation. During the investigation of optical limiting (OL) in colloidal solutions, we found that a blend of AuNPs and ZnPcs in tetrahydrofuran (THF) shows the ability of self-heal photofragmented AuNPs simultaneously to laser irradiation. This self-repairing ability results in enhanced OL performances, that is, lower light limitation threshold and longer durability. Therefore, the blend of AuNPs and ZnPcs represents an infrequent example of a functional nanomaterial that self-heals during its use.
Self-Healing of Gold Nanoparticles during Laser Irradiation: An Embryonic Case of “Systems Nanotechnology”
AMENDOLA, VINCENZO;MENEGHETTI, MORENO
2011
Abstract
We studied a blend of gold nanoparticles (AuNPs) and zinc phthalocyanines (ZnPcs). Noble metal nanoparticles (NMNPs) are known for excellent nonlinear absorption properties, superior to that of the best organic optical limiters such as fullerenes or phthalocyanines. However, NMNPs lose much of these properties after few intense laser pulses due to photoinduced fragmentation. During the investigation of optical limiting (OL) in colloidal solutions, we found that a blend of AuNPs and ZnPcs in tetrahydrofuran (THF) shows the ability of self-heal photofragmented AuNPs simultaneously to laser irradiation. This self-repairing ability results in enhanced OL performances, that is, lower light limitation threshold and longer durability. Therefore, the blend of AuNPs and ZnPcs represents an infrequent example of a functional nanomaterial that self-heals during its use.
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