Comparative Investigation of Energy Relaxation Dynamics of Gold Nanoparticles and Gold−Polypyrrole Encapsulated Nanoparticles

Shin, Hyun Jong; Hwang, In Wook; Hwang, Y.N.; Kim, Dongho; Han, Seon Hee; Lee, Jae‐Suk; Cho, Gyoujin

doi:10.1021/jp022055o

Cited by 58 publications

(40 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The simulated $200 fs electronic energy relaxation is faster than the 1-1.5 ps timescales of the experimental observations for gold particles. 45,46 The difference arises primarily as a result of the small size of the current gold nanorod because electron-phonon coupling is generally stronger in smaller systems with less extended electronic states. Figures 3A and 3B).…”

Section: Plasmon Decay Electron Transfer and Energy Relaxationmentioning

confidence: 99%

Plasmon-Mediated Electron Injection from Au Nanorods into MoS2: Traditional versus Photoexcitation Mechanism

Zhang

Liu

Fang

et al. 2018

Chem

104

View full text Add to dashboard Cite

How can plasmon-initiated charge injection from metallic particles into semiconductors compete with energy losses and charge recombination if the particles possess virtually no energy gaps? We show that the injection mechanism depends on particle-semiconductor interaction chemistry and system morphology and that the traditional mechanism, involving the rapid decay of plasmons into free electrons and subsequent charge injection, competes successfully with charge recombination in Au nanorods on the MoS 2 surface.

show abstract

Section: Plasmon Decay Electron Transfer and Energy Relaxationmentioning

confidence: 99%

Plasmon-Mediated Electron Injection from Au Nanorods into MoS2: Traditional versus Photoexcitation Mechanism

Zhang

Liu

Fang

et al. 2018

Chem

104

View full text Add to dashboard Cite

show abstract

“…Photoexcitation into the plasmonic state of metal particles is a convenient means of changing the energy distribution of electrons to study energy dissipation. There are indications in the literature that the chemical environment of an Au NP impacts the lifetime of hot electrons (12)(13)(14)(15)(16); in these examples, however, the specific mechanism by which the surrounding matrix perturbs the electron dynamics, and the impact of this perturbation on the applicability of the current models for electron cooling-in particular, the 2TM-is not clear. Recently, Bauer and coworkers have described a phenomenological model in which the interface between the Au NP and an organic adlayer changes the rate at which plasmonic electrons equilibrate to form a thermal distribution by providing pathways for redistribution of the hot electrons' kinetic energy.…”

mentioning

confidence: 99%

Identification of parameters through which surface chemistry determines the lifetimes of hot electrons in small Au nanoparticles

Aruda

Tagliazucchi

Sweeney

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

This paper describes measurements of the dynamics of hot electron cooling in photoexcited gold nanoparticles (Au NPs) with diameters of ∼3.5 nm, and passivated with either a hexadecylamine or hexadecanethiolate adlayer, using ultrafast transient absorption spectroscopy. Fits of these dynamics with temperature-dependent Mie theory reveal that both the electronic heat capacity and the electron-phonon coupling constant are larger for the thiolated NPs than for the aminated NPs, by 40% and 30%, respectively. Density functional theory calculations on ligand-functionalized Au slabs show that the increase in these quantities is due to an increased electronic density of states near the Fermi level upon ligand exchange from amines to thiolates. The lifetime of hot electrons, which have thermalized from the initial plasmon excitation, increases with increasing electronic heat capacity, but decreases with increasing electronphonon coupling, so the effects of changing surface chemistry on these two quantities partially cancel to yield a hot electron lifetime of thiolated NPs that is only 20% longer than that of aminated NPs. This analysis also reveals that incorporation of a temperaturedependent electron-phonon coupling constant is necessary to adequately fit the dynamics of electron cooling. two-temperature model | dissipation T his paper describes an observed dependence of two physical properties-the electronic heat capacity and the electronphonon coupling magnitude-of small (diameter of ∼3.5 nm), completely absorptive plasmonic gold nanoparticles (Au NPs) on the surface chemistry of the NPs. The electronic heat capacity, quantified by the coefficient γ, is the amount of energy required to change the temperature of a population of electrons in the NP. The magnitude of the electron-phonon coupling, quantified by the coefficient g, is a measure of the rate of exchange of energy between the electrons and the lattice. Upon photoexcitation of the Au NPs at the absorption maximum of their plasmon resonance, the plasmonic electron oscillation in the NPs rapidly decoheres to form a thermally equilibrated population of hot electrons (1-8). Within the commonly used "two-temperature model (2TM)," the rate of subsequent cooling of these electrons is dictated by the initial electronic temperature of the particle and the efficiency of dissipation of electronic energy into available vibrational modes. These properties, in turn, depend on the electronic heat capacity of the system and the magnitude of electron-phonon coupling. Our observed dependence of the coefficients γ and g on the chemical structure of the organic adlayer therefore implies that electronic states that participate in the electron cooling process are not only those of the gold lattice, but also orbitals at the metal-organic interface-that is, the surface chemistry of the NPs influences the rate of hot electron cooling.Interest in using metal and semiconductor NPs as optical and/or electronic components within energy conversion systems (9, 10) has inspired studies of ene...

show abstract

“…The pump pulse was attenuated to $150 nJ in order to avoid multiphoton excitation. [44][45][46] The pump and probe pulses were focused on the sample and the temporal delay of the probe pulse was varied using a computer-controlled optical delay stage (up to 5 ns with a shortest delay step of 20 fs). Kinetic traces at appropriate wavelengths were assembled from the time-resolved spectral data.…”

Section: Instrumentationmentioning

confidence: 99%

Spectroscopic characterization of the warfarin drug-binding site of folded and unfolded human serum albumin anchored on gold nanoparticles: effect of bioconjugation on the loading capacity

2018

View full text Add to dashboard Cite

show abstract

Comparative Investigation of Energy Relaxation Dynamics of Gold Nanoparticles and Gold−Polypyrrole Encapsulated Nanoparticles

Cited by 58 publications

References 17 publications

Plasmon-Mediated Electron Injection from Au Nanorods into MoS2: Traditional versus Photoexcitation Mechanism

Plasmon-Mediated Electron Injection from Au Nanorods into MoS2: Traditional versus Photoexcitation Mechanism

Identification of parameters through which surface chemistry determines the lifetimes of hot electrons in small Au nanoparticles

Spectroscopic characterization of the warfarin drug-binding site of folded and unfolded human serum albumin anchored on gold nanoparticles: effect of bioconjugation on the loading capacity

Contact Info

Product

Resources

About