论文部分内容阅读
为了探究不同包裹介质对金纳米颗粒的超快等离子体动力学的影响,本文我们制备了聚苯乙烯磺酸钠(PSS)、二氧化硅(SiO_2)、二氧化钛(TiO_2)以及氧化亚铜(Cu_2O)四种介质包裹的金纳米颗粒。运用飞秒泵浦探测技术,我们分别获得了PSS、SiO_2、TiO_2以及Cu_2O包裹的金纳米颗粒在不同时间延迟下的飞秒瞬态吸收光谱。我们发现TiO_2包裹的金纳米颗粒的飞秒瞬态吸收光谱特征与PSS和SiO_2包裹的金纳米颗粒的飞秒瞬态吸收光谱特征有很大的不同,但与Cu2O包裹的金纳米颗粒的飞秒瞬态吸收光谱特征相似。全面分析PSS、SiO_2、TiO_2和Cu_2O包裹的金纳米颗粒的超快等离子体动力学行为,我们发现在TiO_2和Cu2O包裹的金纳米颗粒体系中光激发金纳米颗粒的等离子体共振吸收后产生的激发电子可以有效地转移到TiO_2和Cu_2O的导带上。
In order to investigate the effect of different wrapping media on the ultrafast plasma kinetics of gold nanoparticles, we prepared PSS, SiO 2, TiO 2 and Cu 2 O ) Four media wrapped gold nanoparticles. Using femtosecond pump detection technology, we obtained the femtosecond transient absorption spectra of PSN, SiO_2, TiO_2 and Cu_2O-coated gold nanoparticles with different time delays respectively. We found that the femtosecond transient absorption spectra of TiO_2-coated gold nanoparticles are very different from the femtosecond transient absorption spectra of gold nanoparticles coated by PSS and SiO_2. However, Transient absorption spectra have similar characteristics. A comprehensive analysis of the ultrafast plasma dynamics behavior of gold nanoparticles coated with PSS, SiO_2, TiO_2 and Cu_2O shows that the excitation induced by the plasmon resonance of the photoexcited gold nanoparticles in the TiO_2 and Cu_2O -polluted gold nanoparticle systems Electrons can be efficiently transferred to the conduction band of TiO_2 and Cu_2O.