Nanometer-Thick Films of Aligned ZnO Nanowires Sensitized with Au Nanoparticles for Few-ppb-Level Acetylene Detection

Jiansong Miao, Jerry Y.S. Lin

Research output: Contribution to journalArticlepeer-review

Abstract

Wireless devices for environmental and health monitoring require the development of stable and highly sensitive thin metal oxide gas-sensing films. This paper reports one-step Langmuir-Blodgett assembly of ultrathin (20 nm) nanostructured films of aligned ZnO nanowires with 10 nm-wide v-grooves on the surface, followed by sensitization with Au nanoparticles (Au NPs) by sputtering and postannealing. The ridges of the nanopatterns are revealed as diffusion barriers capable of preventing Au NPs from sintering via particle migration and growth (PMC). The resulting ZnO Langmuir-Blodgett film decorated with high dispersion of small Au NPs functions as a highly responsive conductance switch, which demonstrates unprecedented sensitivity (37 ppm-1) and detection limit (3 ppb) toward acetylene (C2H2), a key marker gas for air pollution caused by anthropogenic emission. The fabrication method for the stabilized nanometric metal on the Langmuir-Blodgett film reported in this work not only provides a general strategy to improve the sensitivity of the thin sensing film but also can be applied to many metal nanodot-based applications, such as solar cells, plasmon-resonance waveguides, and biosensors.

Original languageEnglish (US)
Pages (from-to)9174-9184
Number of pages11
JournalACS Applied Nano Materials
Volume3
Issue number9
DOIs
StatePublished - Sep 25 2020

Keywords

  • nanowire arrays
  • ppb-level sensing
  • sintering resistance
  • templated dewetting
  • ultrathin film

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Nanometer-Thick Films of Aligned ZnO Nanowires Sensitized with Au Nanoparticles for Few-ppb-Level Acetylene Detection'. Together they form a unique fingerprint.

Cite this