Homogeneous line widths of surface plasmons in gold nanoparticles measured by femtosecond pump-and-probe and near-field optical spectroscopy

Perner, M.; Klar, Thomas A.; Große, S.; Lemmer, Uli; Plessen, G. von; Spirkl, W.; Feldmann, Jochen

doi:10.1016/s0022-2313(97)00145-2

Cited by 20 publications

(33 citation statements)

References 5 publications

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“…A set of three consecutive immobilization/removal cycles is presented, using the protocol outlined in the referred figure. For comparison, the inset to Fig. 5 reveals the adsorption characteristics of an initially hydrophobic surface state, with data taken from a freshly mounted, virgin SPR chip, in agreement with previous observations reported for Human Serum Albumin (HSA) immobilization on silver (Ag) [12]. Comparable to Fig.…”

Section: Experimental Aspects and Surface Conditionssupporting

confidence: 89%

“…Theoretical and experimental work on Surface Plasmon (SP)-line broadening effects in nano-particles and thin metal films in the wavelength and energy domain have been reported recently [12][13][14][15]. Influence of temperature, related to SP-phonon interaction and surface non-homogeneities, due to roughness and/or presence adsorbates, have been assigned as prevailing SP-scattering mechanisms [16].…”

Section: Introductionmentioning

confidence: 99%

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Line Shape Analysis and Extended Instrumental Operation of Surface Plasmon Resonance Sensors

et al. 2010

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Line shape effects of the surface plasmon resonance (SPR) at the gold-water interface have been exploited, towards extending instrumental performance in the angular interrogation mode. Comprising a microfluidic set-up both, SPR-line broadening and associated signal symmetry/asymmetry features have been monitored in real time for selected adsorption systems and are compared with the simultaneously taken resonance angle that represents the commonly recorded SPR feature. Four angular broadening contributions have been identified: an intrinsic, temperature independent fraction, a temperature dependent part that dominates at ambient temperature, a surface morphology/roughness contribution and an adsorption related fraction. The latter, and substantially smaller contribution, is crucially affected by surface conditions, as the transition from hydrophobic to a hydrophilic surface state. Anionic sub-monolayer adsorption has been clearly resolved, along with detection of a pronounced calorimetric effect that originates from an exothermic surface reaction upon exposure of the protein covered gold surface to a strong chemical oxidant.

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Section: Experimental Aspects and Surface Conditionssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Line Shape Analysis and Extended Instrumental Operation of Surface Plasmon Resonance Sensors

et al. 2010

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“…4 They also reported recently that the relaxation of photogenerated d-band holes gives a substantial contribution to the electron heating. 6 These results confirm that interband excitations and their relaxation complicate the electron dynamics.…”

Section: Figsupporting

confidence: 58%

“…16,17 Several authors have investigated metallic and in particular gold nanoparticles in solution as well as embedded in a solid matrix. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] After laser excitation, gold nanoparticles show a bleach of the plasmon band due to heating of the electron gas. Ahmadi et al 2,3 measured decay times of 2.5 and Ͼ50 ps for the electron-phonon and phonon-phonon interactions, respectively, in 30 nm gold particles in water when exciting at 380 and 600 nm and probing at the plasmon resonance.…”

Section: Introductionmentioning

confidence: 99%

Electron dynamics in gold and gold–silver alloy nanoparticles: The influence of a nonequilibrium electron distribution and the size dependence of the electron–phonon relaxation

Burda

Wang

El‐Sayed

1999

The Journal of Chemical Physics

341

370

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Electron dynamics in gold nanoparticles with an average diameter between 9 and 48 nm have been studied by femtosecond transient absorption spectroscopy. Following the plasmon bleach recovery after low power excitation indicates that a non-Fermi electron distribution thermalizes by electronelectron relaxation on a time scale of 500 fs to a Fermi distribution. This effect is only observed at low excitation power and when the electron distribution is perturbed by mixing with the intraband transitions within the conduction band ͑i.e., when the excitation wavelength is 630 or 800 nm͒. However, exciting the interband transitions at 400 nm does not allow following the early electron thermalization process. Electron thermalization with the lattice of the nanoparticle by electronphonon interactions occurs within 1.7 ps under these conditions, independent of the excitation wavelength. In agreement with the experiments, simulations of the optical response arising from thermalized and nonthermalized electron distributions show that a non-Fermi electron distribution leads to a less intense bleach of the plasmon absorption. Furthermore, the difference between the response from the two electron distributions is greater for small temperature changes of the electron gas ͑low excitation powers͒. No size dependence of the electron thermalization dynamics is observed for gold nanoparticles with diameters between 9 and 48 nm. High-resolution transmission electron microscopy ͑HRTEM͒ reveals that these gold nanoparticles possess defect structures. The effect of this on the electron-phonon relaxation processes is discussed. 18 nm gold-silver alloy nanoparticles with a gold mole fraction of 0.8 are compared to 15 nm gold nanoparticles. While mixing silver leads to a blue-shift of the plasmon absorption in the ground-state absorption spectrum, no difference is observed in the femtosecond dynamics of the system.

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“…This attention can be attributed to the serious potential advantages of the MIPs usage in place of natural receptors and enzymes, such as their superior stability, low cost, high selectivity and easy preparation. A few examples of detection methods using imprinted polymers include: fluorescence [5], luminescence [6], surface Plasmon resonance [7], quartz crystal microbalance [8], impedance measurement [9], induced scintillation [10], field effect transistor [11], optical approaches [12,13] and acoustic wave sensors [14]. Currently, there is an increasing number of the MIP reports on electrochemical sensors with capacitive [15,16], conductometric [17], amperometric [18,19] and voltammetric [20][21][22] transduction.…”

Section: Introductionmentioning

confidence: 99%

Potentiometric Sensing of Lamotrigine Based on Molecularly Imprinted Polymers

et al. 2011

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In the present work a novel potentiometric sensor, based on a noncovalent imprinted polymer, was developed for determination of Lamotrigine (LTG). At optimized conditions the electrode exhibited a Nernstian response (30.8 AE 1.0 mV decade À1 ) in a concentration range of 1 10 À6 to 1 10 À3 M with a detection limit of 8 10 À7 mol L À1. The potential response of the electrode was constant in the pH range of 1.0-5.0. The electrode demonstrated a response time of~30 s. The selectivity coefficient of the sensor toward a number of different drugs with molecular similarities and some metal ions was evaluated. The electrode was examined for determination of LTG in real samples.

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Homogeneous line widths of surface plasmons in gold nanoparticles measured by femtosecond pump-and-probe and near-field optical spectroscopy

Cited by 20 publications

References 5 publications

Line Shape Analysis and Extended Instrumental Operation of Surface Plasmon Resonance Sensors

Line Shape Analysis and Extended Instrumental Operation of Surface Plasmon Resonance Sensors

Electron dynamics in gold and gold–silver alloy nanoparticles: The influence of a nonequilibrium electron distribution and the size dependence of the electron–phonon relaxation

Potentiometric Sensing of Lamotrigine Based on Molecularly Imprinted Polymers

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