Unravelling the Dependence of Hydrogen Oxidation Kinetics on the Size of Pt Nanoparticles by in Operando Nanoplasmonic Temperature Sensing

Wettergren, Kristina; Hellman, Anders; Cavalca, Filippo; Zhdanov, Vladimir P.; Langhammer, Christoph

doi:10.1021/nl504042u

Cited by 13 publications

(10 citation statements)

References 35 publications

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“…In Figure 3b−f, we plot the measured change in the plasmon peak position, Δλ peak , of flat sensors coated with homogeneous PMMA films (thickness range from 21 to 370 nm), as a function of temperature. At this point it is important to note that the observed peak shifts are calibrated such that the contribution from the intrinsic thermal sensitivity 33 of the plasmonic elements used is removed by subtraction of a blank sensor reference measurement (see Figure S4 for details). Thus, the response is solely due to the thermal evolution of the PMMA films.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Topographically Flat Nanoplasmonic Sensor Chips for Biosensing and Materials Science

et al. 2016

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Nanoplasmonic sensors typically comprise arrangements of noble metal nanoparticles on a dielectric support. Thus, they are intrinsically characterized by surface topography with corrugations at the 10-100 nm length scale. While irrelevant in some bio- and chemosensing applications, it is also to be expected that the surface topography significantly influences the interaction between solids, fluids, nanoparticles and (bio)molecules, and the nanoplasmonic sensor surface. To address this issue, we present a wafer-scale nanolithography-based fabrication approach for high-temperature compatible, chemically inert, topographically flat, and laterally homogeneous nanoplasmonic sensor chips. We demonstrate their sensing performance on three different examples, for which we also carry out a direct comparison with a traditional nanoplasmonic sensor with representative surface corrugation. Specifically, we (i) quantify the film-thickness dependence of the glass transition temperature in poly(methyl metacrylate) thin films, (ii) characterize the adsorption and specific binding kinetics of the avidin-biotinylated bovine serum albumin protein system, and (iii) analyze supported lipid bilayer formation on SiO surfaces.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Topographically Flat Nanoplasmonic Sensor Chips for Biosensing and Materials Science

et al. 2016

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“…Such experiments have not yet been attempted although there are a few LSPR reports describing the effect of temperature on glucose detection in serum samples, 28 the optical response of polymer-functionalized gold nanoprisms, 29 vesicle adsorption and deformation, 30 and heterogeneous catalytic reactions. 31 Herein, the main objective was to investigate the temperature-dependent adsorption of bovine serum albumin (BSA) protein onto silica-coated gold nanodisk arrays by indirect nanoplasmonic sensing measurements, thereby establishing an analytical framework to interpret LSPR measurement data collected in protein adsorption studies. BSA is a 66 kDa protein that was selected for the experimental work because it is widely studied as a model of serum albumins and utilized in various biochemical applications.…”

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“…The latter feature would be particularly advantageous for monitoring protein adsorption at different temperatures. Such experiments have not yet been attempted although there are a few LSPR reports describing the effect of temperature on glucose detection in serum samples, the optical response of polymer-functionalized gold nanoprisms, vesicle adsorption and deformation, and heterogeneous catalytic reactions …”

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Indirect Nanoplasmonic Sensing Platform for Monitoring Temperature-Dependent Protein Adsorption

et al. 2017

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The development of highly surface-sensitive measurement approaches to monitor protein adsorption across different temperatures would advance understanding of how thermally activated processes contribute to the denaturation of adsorbed proteins. Herein, we established an indirect nanoplasmonic sensing approach to monitor the temperature-dependent adsorption and denaturation of bovine serum albumin (BSA) protein onto a silica-coated array of plasmonic gold nanodisks. A theoretical model was developed to explain how the denaturation of an individual, adsorbed protein molecule influences the localized surface plasmon resonance (LSPR) measurement response and provided an analytical framework to estimate the effect of temperature-dependent protein denaturation on the corresponding adsorption kinetics. The sensing performance of this measurement platform was also characterized across the tested range of temperatures. With increasing temperature (up to 50 °C), it was observed that adsorbed proteins undergo greater denaturation. Circular dichroism spectroscopy and dynamic light scattering experiments verified that individual BSA monomers in bulk solution had increasingly lower conformational stability at higher temperatures within this range, which correlated with the extent of denaturation in the adsorbed state. At higher temperatures, distinct kinetic profiles arising from multilayer/aggregate formation on the sensor surface were also detected. Taken together, our findings identify that the high surface sensitivity and temperature stability of LSPR sensors make them broadly useful analytical tools for monitoring thermally activated biomacromolecular interaction processes.

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“…[4][5][6][7][8] The concentration of edge, corner, and facet sites, which are a function of particle size, has been found to have a profound effect on the particle's catalytic activity. [9][10][11][12] It has been observed that the spatial variation of elements in bimetallic systems affects the nanoparticle's catalytic properties by controlling the surface strain and in-situ etching. [13][14][15] Recent studies with bimetallic nanoparticle systems have shown that the elemental distribution within the alloys is not homogenously distributed.…”

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Effect of Precursor Ligands and Oxidation State in the Synthesis of Bimetallic Nano-Alloys

et al. 2015

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The characteristics of bimetallic nanomaterials are dictated by their size, shape and elemental distribution. Solution synthesis is widely utilized to form nanomaterials, such as nanoparticles, with controlled size and shape. However, the effects of variables on the characteristics of bimetallic nanomaterials are not completely understood. In this study, we used a continuous-flow synthetic strategy to explore the effects of the precursor ligands and the precursor oxidation state in the shape-controlled synthesis of platinum alloy nano-octahedra and show their effect on the nanoparticle size and the elemental distribution within the alloy nanoparticle. We demonstrate that this strategy can tune the size of monodisperse PtM (M=Ni or Cu) alloy nanocrystals ranging from 3 to 16 nm with an octahedral shape using acetylacetonate or halide precursors of Pt(II), Pt(IV) and Ni (II) or Cu (II). The nanoparticles formed from halide precursors showed an enrichment of platinum on their surfaces, and the use bromide ligands in the presence of air showed the formation of concave and uneven surface facets. The two nanocrystal precursors can be utilized independently and can control the size with a trend of Pt(acac)2

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Unravelling the Dependence of Hydrogen Oxidation Kinetics on the Size of Pt Nanoparticles by in Operando Nanoplasmonic Temperature Sensing

Cited by 13 publications

References 35 publications

Topographically Flat Nanoplasmonic Sensor Chips for Biosensing and Materials Science

Topographically Flat Nanoplasmonic Sensor Chips for Biosensing and Materials Science

Indirect Nanoplasmonic Sensing Platform for Monitoring Temperature-Dependent Protein Adsorption

Effect of Precursor Ligands and Oxidation State in the Synthesis of Bimetallic Nano-Alloys

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