Hetero-oligomer nanoparticle arrays for plasmon-enhanced hydrogen sensing

Ankun Yang, Mark D. Huntington, M. Fernanda Cardinal, Sicelo S. Masango, Richard P. Van Duyne, Teri W. Odom*

*Corresponding author for this work

Research output: Contribution to journalArticle

43 Scopus citations

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 languageEnglish (US)
Pages (from-to)7639-7647
Number of pages9
JournalACS nano
Volume8
Issue number8
DOIs
StatePublished - 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)

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  • Cite this

    Yang, A., Huntington, M. D., Cardinal, M. F., Masango, S. S., Van Duyne, R. P., & Odom, T. W. (2014). Hetero-oligomer nanoparticle arrays for plasmon-enhanced hydrogen sensing. ACS nano, 8(8), 7639-7647. https://doi.org/10.1021/nn502502r