Direct Comparison of PdAu Alloy Thin Films and Nanoparticles upon Hydrogen Exposure
Artikel i vetenskaplig tidskrift, 2019

Nanostructured metal hydrides are able to efficiently detect hydrogen in optical sensors. In the literature, two nanostructured systems based on metal hydrides have been proposed for this purpose each with its own detection principle: continuous sub-100 nm thin films read out via optical reflectance/transmittance changes and nanoparticle arrays for which the detection relies on localized surface plasmon resonance. Despite their apparent similarities, their optical and structural response to hydrogen has never been directly compared. In response, for the case of Pd 1-y Au y (y = 0.15-0.30) alloys, we directly compare these two systems and establish that they are distinctively different. We show that the dissimilar optical response is not caused by the different optical readout principles but results from a fundamentally different structural response to hydrogen due to the different nanostructurings. The measurements empirically suggest that these differences cannot be fully accounted by surface effects but that the nature of the film-substrate interaction plays an important role and affects both the hydrogen solubility and the metal-to-metal hydride transition. In a broader perspective, our results establish that the specifics of nanoconfinement dictate the structural properties of metal hydrides, which in turn control the properties of nanostructured devices including the sensing characteristics of optical hydrogen sensors and hydride-based active plasmonic systems.

X-ray diffraction

nanoparticles

optical hydrogen sensing

plasmonics

metal hydride

nanostructuring

PdAu

thin films

Författare

Lars J. Bannenberg

Technische Universiteit Delft

Ferry Nugroho

Chalmers, Fysik, Kemisk fysik

Herman Schreuders

Technische Universiteit Delft

Ben Norder

Technische Universiteit Delft

Thu Trang Trinh

Helmholtz-Zentrum Dresden-Rossendorf

Nina Juliane Steinke

Rutherford Appleton Laboratory

Ad A. Van Well

Technische Universiteit Delft

Christoph Langhammer

Chalmers, Fysik

B. Dam

Technische Universiteit Delft

ACS Applied Materials & Interfaces

1944-8244 (ISSN) 1944-8252 (eISSN)

Vol. 11 17 15489-15497

Ämneskategorier

Annan fysik

Annan kemi

Den kondenserade materiens fysik

DOI

10.1021/acsami.8b22455

PubMed

30964257

Mer information

Senast uppdaterat

2019-07-26