Photothermal properties of gold nanoparticles under exposure to high optical energies
Photothermal properties of gold nanoparticles under exposure to high optical energies
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DOI：
10.1088/0957-4484/19/35/355702
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发表时间：
2008-09-03
期刊：
影响因子：
3.5
通讯作者：
Lapotko, D. O.
中科院分区：
文献类型：
--
作者：
Hleb, E. Y.;Lapotko, D. O.
实验研究了金纳米粒子（NP）球、棒和硅-金壳在纳秒激光脉冲激发下的光热（PT）效应和损伤阈值。发现具有近红外（NIR）等离子体共振（金棒和壳）的金NP的PT功效的最大值和它们的损伤阈值的最小值从它们的等离子体共振NIR波长移动到非共振可见波长。发现NIR等离子体共振（漂白）的PT功效的这种抑制对于杆高达18倍，并且对于壳高达22倍。在激光诱导的劣化过程中，NP在暴露于激光脉冲后至少在40-150 ns内保持其PT性质。在上述时间内，可以用脉冲串模式增强金纳米颗粒的PT特性。在过热NP周围产生的PT气泡被用作其光学标记，并允许我们在其他NP检测方法不适用的条件下通过气泡参数量化等离子体共振的PT功效。
Photothermal (PT) efficacy and damage thresholds of gold nanoparticles (NP)-spheres, rods and silica-gold shells-were experimentally studied during their excitation with nanosecond laser pulses at the fluence levels at and above the NP damage threshold. The maxima of PT efficacy of gold NPs with near-infrared (NIR) plasmon resonances (gold rods and shells) and the minima of their damage thresholds were found to be shifted from their plasmon resonance NIR wavelengths into non-resonant visible wavelengths. This suppression of PT efficacy of NIR plasmon resonances (bleaching) was found to be up to 18 times for the rods and up to 22 times for the shells. During laser-induced deterioration the NPs maintained their PT properties at least within 40-150 ns after exposure to laser pulses. PT properties of the gold NPs can be enhanced with the pulse train mode within the above time. The PT bubbles generated around superheated NPs were used as their optical markers and allowed us to quantify PT efficacy of plasmon resonance through the bubble parameters under the conditions when other methods of NP detection are not applicable.