Hot electron and phonon dynamics of gold nanoparticles embedded in a gel matrix

Mohamed, Mona; Ahmadi, Temer S.; Link, Stephan; Braun, Markus; El‐Sayed, Mostafa A.

doi:10.1016/s0009-2614(01)00653-4

Cited by 108 publications

(95 citation statements)

References 25 publications

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“…These reports dealt with the so-called ''naked metal NPs'', that means either metal NPs without adsorbates or a situation where the surrounding medium (matrix) does not affect nonequilibrium electron dynamics. Several studies have shown that the surrounding medium strongly influences the dynamics of hot electron cooling within the strong perturbation regime [36][37][38]. Furthermore, the chemical nature of adsorbates can also affect the electron-phonon coupling rates in gold core-shell NPs as reported by Westcott et al [39].…”

Section: Size Dependence Investigations On Electron-phonon Coupling Rmentioning

confidence: 94%

Size dependence investigations of hot electron cooling dynamics in metal/adsorbates nanoparticles

Bauer¹,

Abid²,

Girault³

2005

Chemical Physics

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The size dependence of electron-phonon coupling rate has been investigated by femtosecond transient absorption spectroscopy for gold nanoparticles (NPs) wrapped in a shell of sulfate with diameter varying from 1.7 to 9.2 nm. Broad-band spectroscopy gives an overview of the complex dynamics of nonequilibrium electrons and permits the choice of an appropriate probe wavelength for studying the electron-phonon coupling dynamics. Ultrafast experiments were performed in the weak perturbation regime (less than one photon in average per nanoparticle), which allows the direct extraction of the hot electron cooling rates in order to compare different NPs sizes under the same conditions. Spectroscopic data reveals a decrease of hot electron energy loss rates with metal/ adsorbates nanosystem sizes. Electron-phonon coupling time constants obtained for 9.2 nm NPs are similar to gold bulk materials ($1 ps) whereas an increase of hot electron cooling time up to 1.9 ps is observed for sizes of 1.7 nm. This is rationalized by the domination of surface effects over size (bulk) effects. The slow hot electron cooling is attributed to the adsorbates-induced long-lived nonthermal regime, which significantly reduces the electron-phonon coupling strength (average rate of phonon emission).

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Section: Size Dependence Investigations On Electron-phonon Coupling Rmentioning

confidence: 94%

Size dependence investigations of hot electron cooling dynamics in metal/adsorbates nanoparticles

Bauer¹,

Abid²,

Girault³

2005

Chemical Physics

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“…Single wavelength kinetics of the plasmon bleach recovery of gold nanoparticles of different shapes is recorded [11]. The pump wavelength was 400 nm in all experiments which were performed at room temperature.…”

Section: Hot Carrier Dynamics Of Gold Nanoparticles Of Different Shapesmentioning

confidence: 99%

Thermal Stability and Hot Carrier Dynamics of Gold Nanoparticles of Different Shapes

Attia¹,

Altalhi²,

Gobouri³

2015

ANP

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Anisotropic shapes of gold nanoparticles are prepared using a modified seed method in the presence of silver ions or clusters in order to study the thermal stability and the dynamics of the hot carriers induced by femtosecond laser pulses. Although gold nanospheres are stable towards thermal treatment, the decomposition of the gold nanorods into spherical nanoparticle aggregates upon thermal treatment is mechanistically different from the case of nanoprisms. Great enhancement of thermal stability is achieved by modifying the surface of the nanoparticles by adding specific amounts of polyvinyl pyrrolidone (PVP) after preparation of gold particles of different shapes capped with cetyltrimethylammonium bromide (CTAB). The surface plasmon resonance spectra of the gold nanostructures are used to monitor their morphological changes. In regards to the hot carrier dynamics, it is found that the phonon-phonon (ph-ph) coupling is much slower in dots than in rods and prisms while electron-phonon (e-ph) coupling is almost the same in these particles.

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“…Then energy is transferred from electrons to lattice phonons and the tem− perature of electrons and metal lattice reach a new balance. The size−dependence of the e−e coupling and hot electron energy relaxation processes in metal nanoparticles have been studied extensively, and enhanced electron−surface (e−s) scattering has already been discussed in depth [6][7][8][9]. The parameter G eff is used to explain the velocity of energy transference, which includes the electron−phonon (e−ph) interactions and the e−s interactions, from hot elec− trons to metal lattice.…”

Section: The Size-dependence Of Hot Electronic Energy Relaxation In Smentioning

confidence: 99%

“…As the size continues to decrease (especially the radius is smaller than 5 nm [9]), the sum of the decrement in G e−ph and the increment in G e−s , varying in different samples and their sur− rounding dielectric, decides the variation trend of the G eff because of the competing effect of e−s and e−ph coupling mechanism [6,[8][9][10][12][13].…”

Section: The Size-dependence Of Hot Electronic Energy Relaxation In Smentioning

confidence: 99%

See 1 more Smart Citation

Size-dependence of the effective electron-phonon energy relaxation in hollow gold nanospheres

Fan

Chen

et al. 2014

Opto-Electronics Review

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In this paper the size-dependence of energy relaxation, which is induced by the electron-phonon (e-ph) interactions and the electron-surface (e-s) interactions in noble metal nanoparticles, is investigated. Then based on the analysis and the derivation of the e-s coupling constant in metal nanospheres, the formula of the effective electron-phonon coupling constant Geff of hollow gold nanospheres (HGNs) is deduced. Moreover, the correctness of the formulae gets proved by contrast analyses of the calculated Geff values and experimental values obtained from literature.

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Hot electron and phonon dynamics of gold nanoparticles embedded in a gel matrix

Cited by 108 publications

References 25 publications

Size dependence investigations of hot electron cooling dynamics in metal/adsorbates nanoparticles

Size dependence investigations of hot electron cooling dynamics in metal/adsorbates nanoparticles

Thermal Stability and Hot Carrier Dynamics of Gold Nanoparticles of Different Shapes

Size-dependence of the effective electron-phonon energy relaxation in hollow gold nanospheres

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