物理化学学报 >> 2017, Vol. 33 >> Issue (11): 2184-2190.doi: 10.3866/PKU.WHXB201705222

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金纳米颗粒在不同包裹介质中的超快等离子体动力学

陈晓宇,王经东,于安池*()   

  • 收稿日期:2017-04-26 发布日期:2017-08-25
  • 通讯作者: 于安池 E-mail:a.yu@chem.ruc.edu.cn
  • 基金资助:
    国家自然科学基金(21373269)

Effect of Surrounding Media on Ultrafast Plasmon Dynamics of Gold Nanoparticles

Xiao-Yu CHEN,Jing-Dong WANG,An-Chi YU*()   

  • Received:2017-04-26 Published:2017-08-25
  • Contact: An-Chi YU E-mail:a.yu@chem.ruc.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21373269)

摘要:

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(SiO2)、二氧化钛(TiO2)以及氧化亚铜(Cu2O)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、SiO2、TiO2以及Cu2O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TiO2包裹的金纳米颗粒的飞秒瞬态吸收光谱特征与PSS和SiO2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、SiO2、TiO2和Cu2O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TiO2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TiO2和Cu2O的导带上。

关键词: 飞秒瞬态吸收光谱, 等离子体共振激发, 电子转移, 金纳米颗粒, 核/壳结构

Abstract:

Herein, we prepared four samples, namely gold/poly(sodium-p-styrenesulfonate) (Au/PSS), gold/silicon dioxide (Au/SiO2), gold/titanium dioxide (Au/TiO2), and gold/cuprous oxide (Au/Cu2O) core/shell nanocomposites, to investigate how the surrounding medium affects the ultrafast plasmon dynamics of Au nanoparticles (NPs). We recorded femtosecond transient absorption spectra of Au NPs in Au/PSS, Au/SiO2, Au/TiO2, and Au/Cu2O core/shell nanocomposites at various time delays. We found that the spectral features in the femtosecond transient absorption spectra of Au NPs in Au/TiO2 and Au/Cu2O core/shell nanocomposites were dramatically different from those of Au NPs in Au/PSS and Au/SiO2 core/shell nanocomposites. A comprehensive analysis of the ultrafast plasmon dynamics of Au NPs in the core/shell nanocomposites revealed that following excitation of the resonance plasmon band of Au NPs, the exited electrons could be efficiently transferred into the conduction bands of TiO2 and Cu2O in Au/TiO2 and Au/Cu2O core/shell nanocomposites.

Key words: Femtosecond transient absorption spectroscopy, Plasmon resonance excitation, Electron transfer, Gold nanoparticle, Core/shell structure

MSC2000: 

  • O643