<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Link, Stephan</style></author><author><style face="normal" font="default" size="100%">Furube, A.</style></author><author><style face="normal" font="default" size="100%">Mohamed, MB</style></author><author><style face="normal" font="default" size="100%">Asahi, T.</style></author><author><style face="normal" font="default" size="100%">Masuhara, H.</style></author><author><style face="normal" font="default" size="100%">El-Sayed, Mostafa A</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Hot electron relaxation dynamics of gold nanoparticles embedded in MgSO4 powder compared to solution: The effect of the surrounding medium</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry B</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2002</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Feb</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">5</style></number><volume><style face="normal" font="default" size="100%">106</style></volume><pages><style face="normal" font="default" size="100%">945-955</style></pages><isbn><style face="normal" font="default" size="100%">1520-6106</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">To test the influence of the surrounding medium on the relaxation dynamics of the plasmon band bleach recovery of gold nanoparticles after excitation with femtosecond laser pulses, we embedded 14.5 and 12.1 nm colloidal gold nanoparticles (synthesized electrochemically) in MgSO4 powder and investigated these samples by femtosecond diffuse reflectance spectroscopy. By measuring the relaxation dynamics over a wide range of excitation energies, we found that the fast decay component is slower by about a factor of 2 for the particles in the MgSO4 powder compared to those in solution while no significant change in the slow decay component is observed. In agreement with this observation, we found that adding solvent to the particles embedded in the powder caused a decrease in the relaxation time from about 10 ps to 5 ps for the fast decay component. This leads to the conclusion that the electron-phonon relaxation in these gold nanoparticles depends on the chemical nature and/or physical phase (solid vs solution) of the surrounding medium. A discussion of this in terms of the type of phonon involved, and the nature of the electron-phonon and phonon-phonon relaxation processes is discussed. To our knowledge, this also presents the first time that a transient bleach could be observed by diffuse reflectance spectroscopy.</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:000173692100010</style></accession-num><notes><style face="normal" font="default" size="100%">Link, S Furube, A Mohamed, MB Asahi, T Masuhara, H El-Sayed, MA</style></notes><electronic-resource-num><style face="normal" font="default" size="100%">10.1021/jp013311k</style></electronic-resource-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Mohamed, MB</style></author><author><style face="normal" font="default" size="100%">Ahmadi, Temer S.</style></author><author><style face="normal" font="default" size="100%">Link, Stephan</style></author><author><style face="normal" font="default" size="100%">Braun, Markus</style></author><author><style face="normal" font="default" size="100%">El-Sayed, Mostafa A</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Hot electron and phonon dynamics of gold nanoparticles embedded in a gel matrix</style></title><secondary-title><style face="normal" font="default" size="100%">Chemical Physics Letters</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2001</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Jul</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">1-2</style></number><volume><style face="normal" font="default" size="100%">343</style></volume><pages><style face="normal" font="default" size="100%">55-63</style></pages><isbn><style face="normal" font="default" size="100%">0009-2614</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Using pump-probe technique, the dynamics of the hot carriers in metallic nanodots induced by femtosecond laser pulses are investigated in gold nanoparticles embedded in hydrogel and in organic gel and compared to that in aqueous solution. We found that changing the surrounding matrix from aqueous solution to hydrogel and then to organic gel leads to a large increase in the relaxation time of both the electron-phonon (e-ph) and the phonon-phonon (ph-ph) coupling. Furthermore, the ph-ph relaxation time becomes sensitive to the type of the organic solvent trapped in the gel network. This indicates that the relaxation dynamics depend on the thermal conductivity, chemical structure and the molecular dynamics of the surrounding medium. (C) 2001 Elsevier Science BN. All rights reserved.</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:000170144200010</style></accession-num><notes><style face="normal" font="default" size="100%">Mohamed, MB Ahmadi, TS Link, S Braun, M El-Sayed, MA</style></notes><electronic-resource-num><style face="normal" font="default" size="100%">10.1016/s0009-2614(01)00653-4</style></electronic-resource-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Link, Stephan</style></author><author><style face="normal" font="default" size="100%">Wang, Z.L.</style></author><author><style face="normal" font="default" size="100%">El-Sayed, Mostafa A</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">How does a gold nanorod melt?</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry B</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2000</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Aug</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">33</style></number><volume><style face="normal" font="default" size="100%">104</style></volume><pages><style face="normal" font="default" size="100%">7867-7870</style></pages><isbn><style face="normal" font="default" size="100%">1089-5647</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Structural transformation of gold nanorods are investigated by high-resolution transmission electron microscopy after they have been exposed to low-energy femtosecond and nanosecond laser pulses in colloidal solution. The pulse energies were below the gold nanorod melting threshold, but allowed early stage shape transformation processes, It is found that while the as-prepared nanorods are defect-free, laser-irradiation induces point and line defects. The defects are dominated by (multiple) twins and stacking faults (planar defects), which are the precursor that drives the nanorods to convert their {110} facets into the more stable {100} and {111} facets and hence minimize their surface energy. These observations suggest that short-laser pulsed photothermal melting begins with the creation of defects inside the nanorods followed by surface reconstruction and diffusion, in contrast with the thermal melting of the rods or the bulk material, where the melting starts at the surface.</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:000088945700001</style></accession-num><notes><style face="normal" font="default" size="100%">Link, S Wang, ZL El-Sayed, MA</style></notes><electronic-resource-num><style face="normal" font="default" size="100%">10.1021/jp0011701</style></electronic-resource-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Link, Stephan</style></author><author><style face="normal" font="default" size="100%">Burda, Clemens</style></author><author><style face="normal" font="default" size="100%">Nikoobakht, Babak</style></author><author><style face="normal" font="default" size="100%">El-Sayed, Mostafa A</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">How long does it take to melt a gold nanorod? A femtosecond pump-probe absorption spectroscopic study</style></title><secondary-title><style face="normal" font="default" size="100%">Chemical Physics Letters</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1999</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Dec</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">1-2</style></number><volume><style face="normal" font="default" size="100%">315</style></volume><pages><style face="normal" font="default" size="100%">12-18</style></pages><isbn><style face="normal" font="default" size="100%">0009-2614</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Using pump-probe femtosecond transient absorption spectroscopy, we determined the rate of the bleach of absorption around 700-800 nm due to the longitudinal surface plasmon band of gold nanorods. Using TEM of the spotted, completely irradiated solutions suggest that the dominant products of the photothermal conformation of the rods are spheres of comparable volume. This lead to the conclusion that the melting of the rods is at least 30-35 ps, independent of the power used (5-20 mu J) or the nanorod aspect ratio (1.9-3.7). (C) 1999 Elsevier Science B.V. All rights reserved.</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:000084321900003</style></accession-num><notes><style face="normal" font="default" size="100%">Link, S Burda, C Nikoobakht, B El-Sayed, MA</style></notes><electronic-resource-num><style face="normal" font="default" size="100%">10.1016/s0009-2614(99)01214-2</style></electronic-resource-num></record></records></xml>