Hysteresis-Free Nanoplasmonic Pd-Au Alloy Hydrogen Sensors
Artikel i vetenskaplig tidskrift, 2015

The recent market introduction of hydrogen fuel cell cars and the prospect of a hydrogen economy have drastically accelerated the need for safe and accurate detection of hydrogen. In this Letter, we investigate the use of arrays of nanofabricated Pd-Au alloy nanoparticles as plasmonic optical hydrogen sensors. By increasing the amount of Au in the alloy nanoparticles up to 25 atom %, we are able to suppress the hysteresis between hydrogen absorption and desorption, thereby increasing the sensor accuracy to below 5% throughout the investigated 1 mbar to 1 bar hydrogen pressure range. Furthermore, we observe an 8-fold absolute sensitivity enhancement at low hydrogen pressures compared to sensors made of pure Pd, and an improved sensor response time to below one second within the 0-40 mbar pressure range, that is, below the flammability limit, by engineering the nanoparticle size.

localized surface plasmon resonance

alloy nanoparticles

Hydrogen sensing

palladium

plasmonic sensing

Författare

Carl Wadell

Chalmers, Teknisk fysik, Kemisk fysik

Ferry Nugroho

Chalmers, Teknisk fysik, Kemisk fysik

Emil Lidström

Chalmers University of Technology

Beniamino Iandolo

Danmarks Tekniske Universitet (DTU)

Jakob B. Wagner

Danmarks Tekniske Universitet (DTU)

Christoph Langhammer

Chalmers, Teknisk fysik, Kemisk fysik

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 15 3563-3570

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Fysikalisk kemi

Nanoteknik

DOI

10.1021/acs.nanolett.5b01053