Abstract
This paper describes how the ability to tune each nanoparticle in a plasmonic hetero-oligomer can optimize architectures for plasmon-enhanced applications. We demonstrate how a large-area nanofabrication approach, reconstructable mask lithography (RML), can achieve independent control over the size, position, and material of up to four nanoparticles within a subwavelength unit. We show how arrays of plasmonic hetero-oligomers consisting of strong plasmonic materials (Au) and reactant-specific elements (Pd) provide a unique platform for enhanced hydrogen gas sensing. Using finite-difference time-domain simulations, we modeled different configurations of Au-Pd hetero-oligomers and compared their hydrogen gas sensing capabilities. In agreement with calculations, we found that Au-Pd nanoparticle dimers showed a red-shift and that Au-Pd trimers with touching Au and Pd nanoparticles showed a blue-shift upon exposure to both high and low concentrations of hydrogen gas. Both Au-Pd hetero-oligomer sensors displayed high sensitivity, fast response times, and excellent recovery.
Original language | English |
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Pages (from-to) | 7639-7647 |
Number of pages | 9 |
Journal | ACS nano |
Volume | 8 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2014 |
Keywords
- Au-Pd nanoparticle dimers
- Au-Pd nanoparticle trimers
- heterogeneous oligomers
- hydrogen sensing
- nanofabrication
- plasmonic assemblies
ASJC Scopus subject areas
- Materials Science(all)
- Engineering(all)
- Physics and Astronomy(all)