Selective Plasmonic Gas Sensing: H2, NO2, and CO Spectral Discrimination by a Single Au-CeO2Nanocomposite Film

Joy, Nicholas; Nandasiri, Manjula I.; Rogers, Phillip H.; Jiang, Weilin; Varga, Tamás; Kuchibhatla, Satyanarayana V N T; Thevuthasan, Suntharampillai; Carpenter, Michael A.

doi:10.1021/ac3006846

Cited by 107 publications

(102 citation statements)

References 38 publications

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“…15,17,18 Optical shifts in Au NPs/metal oxide gas sensors are often considered to be the consequence of electron exchange on the metal at the metal/oxide interface, as well as an effect of dielectric changes in the support. 19,20 It is therefore crucial to understand the separate contributions that modifying the free-electron density on the plasmonic particles and the dielectric function of More recent studies showed that gas sorption can be followed even at the single particle level by dark-field microscopy (DFM plane has a more uniform, three dimensional environment than a multilayer or a mixed layer.…”

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confidence: 99%

Hydrogen Spillover between Single Gold Nanorods and Metal Oxide Supports: A Surface Plasmon Spectroscopy Study

et al. 2015

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We used dark field spectroscopy to monitor the dissociation of hydrogen on single gold nanoparticles embedded in metal oxide supports. Individual gold nanorods were monitored in real time to reveal the peak position, the full width at half-maximum, and the relative intensity of the surface plasmon resonances during repeated N2-H2-N2 and air-H2-air cycles. Shifts in the spectra are shown to be due to changes in electron density and not to refractive index shifts in the environment. We demonstrate that hydrogen does not dissociate on gold nanorods (13 nm × 40 nm) at room temperature when in contact with silica and that electrons or hydrogen atoms migrate from Pt nanoparticles to Au nanoparticles through the supporting metal oxide at room temperature. However, this spillover mechanism only occurs for semiconducting oxides (anatase TiO2 and ZnO) and does not occur for Au and Pt nanoparticles embedded in silica. Finally, we show that hydrogen does dissociate directly on anatase surfaces at room temperature during air-H2-air cycles. Our results show that hydrogen spillover, surface dissociation of reactants, and surface migration of chemical intermediates can be detected and monitored in real time at the single particle level.

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confidence: 99%

Hydrogen Spillover between Single Gold Nanorods and Metal Oxide Supports: A Surface Plasmon Spectroscopy Study

et al. 2015

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“…[17][18][19] To date, many porous structures of these three metal oxides have been synthesized. However, there are few reports on the use of a facile and general method to synthesize their hierarchically porous structures.…”

Section: 16mentioning

confidence: 99%

General fabrication and enhanced VOC gas-sensing properties of hierarchically porous metal oxides

et al. 2017

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A facile and general route to synthesize hierarchically porous metal oxide nanostructures was reported here. The results indicate that the hierarchically porous metal oxides show high sensitivity to toxic or dangerous gases. The signal sensitivity of the gas sensors exhibits a good linear relation with the VOC gas concentration. As one of the as-synthesized hierarchically porous metal oxides, ZnO exhibits the lowest detection limit of 15 ppb for formaldehyde, which is much lower than the limit value of indoor formaldehyde (60 ppb). Furthermore, the sensitivity of the ZnO porous nanosheets decorated with Au nanoparticles is 10 ppb for formaldehyde, which is about 1.5 times higher than that of the unmodified ZnO porous nanosheets.

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“…An Arrhenius analysis of the data determined the activation energy to be about 0.2 eV for the H(2) reaction [96] . In the latest work by the same group a Au-CeO(2) nanocomposite fi lm was investigated as the sensing element for selective high-temperature detection of H(2), CO, and NO (2) in an oxygen containing environment [97] . The interaction of these gases affected the LSPR peak position either by charge exchange with the Au nanoparticles or by changes in the dielectric constant of the ceria material surrounding the particles.…”

Section: Gas Sensing and Catalysis Applicationsmentioning

confidence: 99%

Nanoplasmonic sensing for nanomaterials science

Larsson¹,

Syrenova

Langhammer

2012

Nanophotonics

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Nanoplasmonic sensing has over the last two decades emerged as and diversifi ed into a very promising experimental platform technology for studies of biomolecular interactions and for biomolecule detection (biosensors). Inspired by this success, in more recent years, nanoplasmonic sensing strategies have been adapted and tailored successfully for probing functional nanomaterials and catalysts in situ and in real time. An increasing number of these studies focus on using the localized surface plasmon resonance (LSPR) as an experimental tool to study a process of interest in a nanomaterial, with a materials science focus. The key assets of nanoplasmonic sensing in this area are its remote readout, non-invasive nature, single particle experiment capability, ease of use and, maybe most importantly, unmatched fl exibility in terms of compatibility with all material types (particles and thin/thick layers, conductive or insulating) are identifi ed. In a direct nanoplasmonic sensing experiment the plasmonic nanoparticles are active and simultaneously constitute the sensor and the studied nano-entity. In an indirect nanoplasmonic sensing experiment the plasmonic nanoparticles are inert and adjacent to the material of interest to probe a process occurring in/on this material. In this review we defi ne and discuss these two generic experimental strategies and summarize the growing applications of nanoplasmonic sensors as experimental tools to address materials science-related questions.

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Selective Plasmonic Gas Sensing: H₂, NO₂, and CO Spectral Discrimination by a Single Au-CeO₂Nanocomposite Film

Cited by 107 publications

References 38 publications

Hydrogen Spillover between Single Gold Nanorods and Metal Oxide Supports: A Surface Plasmon Spectroscopy Study

Hydrogen Spillover between Single Gold Nanorods and Metal Oxide Supports: A Surface Plasmon Spectroscopy Study

General fabrication and enhanced VOC gas-sensing properties of hierarchically porous metal oxides

Nanoplasmonic sensing for nanomaterials science

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