Mechanism of hydrogen adsorption on gold nanoparticles and charge transfer probed by anisotropic surface plasmon resonance

Watkins, W.L.H.; Borensztein, Y.

doi:10.1039/c7cp04843b

Cited by 22 publications

(24 citation statements)

References 59 publications

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“…The carrying gas presented so far was chosen to be Ar due to its inertness to Pd, in order to investigate the intrinsic capabilities of the TAS method with comparison to previously investigated plasmonic Pd-based sensors. Nevertheless, we have verified the response of the sample to pure O 2 , to pure synthetic dry air and to 50% relative humidity in Ar, particles, leading to charge transfer between metallic Pd and the adsorbed molecules, in the same way as it has been shown previously for adsorption of oxygen and of hydrogen on gold [21,69,70].…”

Section: Selectivity ; H 2 In Dry or Humid Airsupporting

confidence: 83%

“…Most LSPR-based sensors [14][15][16][17][18][19][20] are made of Au NPs which exhibit a well-defined plasmonic resonance. Au NPs having weak interaction with H 2 [21], hybrid systems such as core-shell Au-Pd NPs [22,23], AuPd alloy NPs [20], Au NPs -Pd NPs oligomers [24,25] have been used. In these systems, the hydrogenation of Pd modifies the dielectric environment of the Au NPs, hence induces a shift in wavelength of the LSPR of Au, which gives a measurement of the presence of H 2 [13].…”

Section: Introductionmentioning

confidence: 99%

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Ultrasensitive and fast single wavelength plasmonic hydrogen sensing with anisotropic nanostructured Pd films

Watkins

Borensztein

2018

Sensors and Actuators B: Chemical

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Anisotropic nanostructured porous Pd films are fabricated using oblique angle deposition in vacuum on a glass substrate.They display a dichroic response, due to localised surface plasmon resonances (LSPR) within the nanoparticles forming the film, dependent on the incident light polarisation. Ultrasensitive hydrogen sensing is reached by using these films in conjunction with a differential optical technique derived from the reflectance anisotropy spectroscopy. The evolution of the samples' optical responses is monitored during the formation of Pd hydride in both the dilute α-phase and the dense βphase, whilst the samples are exposed to different concentration of H 2 in Ar (from 100% H 2 to a few ppm). The measurements are performed at a single wavelength in the visible range and at 22°C. The results show that a quantitative measurement of the hydrogen concentration in a carrier gas can be measured throughout the concentration range. The limit of detection is 10 ppm and the time for detecting the presence of H 2 in the carrying gas is below one second at concentration down to 0.25% of H 2 in Ar. Furthermore, the optical anisotropy of the samples and its evolution with exposure to H 2 are correctly reproduced with an effective medium theory.

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Section: Selectivity ; H 2 In Dry or Humid Airsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Ultrasensitive and fast single wavelength plasmonic hydrogen sensing with anisotropic nanostructured Pd films

Watkins

Borensztein

2018

Sensors and Actuators B: Chemical

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“…As a result, the layer of adsorbed H atoms is unstable. However, experimentation on hydrogen interaction with gold nanoparticles given in this paper and other works [20,[29][30][31] demonstrates the existence of a fairly stable form of hydrogen adsorption. How can these results be explained?…”

Section: Theoretical Portion and Quantum Chemical Simulationmentioning

confidence: 47%

Hydrogenation of HOPG-supported Gold Nanoparticles: Features of Initial Stages

et al. 2019

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The features of deuterium adsorption on the surface of gold nanoparticles deposited on highly oriented pyrolytic graphite (HOPG) were determined. The results showed that deuterium adsorption on gold nanoparticles takes place at room temperature. The results also showed that the filling of the nanoparticles’ surfaces with the adsorbate occurs from the graphite–gold interface until the entire surface is covered by deuterium. The results of quantum chemical simulations are used to explain the experimental data. A simple model of the observed effects is proposed.

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“…In this work, the Ohmic behavior of the Au-TiO2 junction in hydrogen atmosphere was associated to a reduction of the Au surface work function by several tens of an eV. An additional experimental information on the charge transfer between Au and H2 has been recently reported [52]. These experiments reported a negative charge transfer from Au nanoparticles to adsorbed H2 at ambient conditions, such that these nanoparticles become positively charged.…”

Section: Now We Investigate How the Formation Of Multiple Cnps Under mentioning

confidence: 56%

Reversible doping of graphene field effect transistors by molecular hydrogen: the role of the metal/graphene interface

Pereira¹,

Cadore²,

Rezende³

et al. 2019

2D Mater.

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In this work, we present an investigation regarding how and why molecular hydrogen changes the electronic properties of graphene field effect transistors. We demonstrate that interaction with H2 leads to local doping of graphene near of the graphene-contact heterojunction. We also show that such interaction is strongly dependent on the characteristics of the metal-graphene interface. By changing the type metal in the contact, we observe that Ohmic contacts can be strongly or weakly electrostatically coupled with graphene. For strongly coupled contacts, the signature of the charge transfer effect promoted by the contacts results on an asymmetric ambipolar conduction, and such asymmetry can be tunable under interaction with H2. On the other hand, for contacts weakly coupled with graphene, the hydrogen interaction has a more profound effect. In such situation, the devices show a second charge neutrality point in graphene transistor transfer curves (a double-peak response) upon H2 exposure. We propose that this double-peak phenomenon arises from the decoupling of the work function of graphene and that of the metallic electrodes induced by the H2 molecules. We also show that the gas-induced modifications at the metal-graphene interface can be exploited to create a controlled graphene p-n junction, with considerable electron transfer to graphene layer and significant variation in the graphene resistance. These effects can pave the way for a suitable metallic contact engineering providing great potential for the application of such devices as gas sensors.

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Mechanism of hydrogen adsorption on gold nanoparticles and charge transfer probed by anisotropic surface plasmon resonance

Cited by 22 publications

References 59 publications

Ultrasensitive and fast single wavelength plasmonic hydrogen sensing with anisotropic nanostructured Pd films

Ultrasensitive and fast single wavelength plasmonic hydrogen sensing with anisotropic nanostructured Pd films

Hydrogenation of HOPG-supported Gold Nanoparticles: Features of Initial Stages

Reversible doping of graphene field effect transistors by molecular hydrogen: the role of the metal/graphene interface

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