4.6 Article

Highly sensitive H2S detection sensors at low temperature based on hierarchically structured NiO porous nanowall arrays

Journal

JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 22, Pages 11991-11999

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00811e

Keywords

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Funding

  1. National Natural Science Foundation of China [61271126, 21201060, 21305033]
  2. Program for Innovative Research Team in University [IRT-1237]
  3. Program for Science and Technology Project of Heilongjiang province [B201101, B201414]
  4. Heilongjiang Educational Department [2013TD002, 2011CJHB006, 12531506]
  5. Youth Foundation of Harbin [2013RFQXJ142]

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3D network-like, hierarchically structured, porous nanowall NiO arrays were grown in situ on ceramic tubes by a facile but environmentally friendly hydrothermal reaction with a subsequent calcination process. The arrays were constructed of the interconnected porous nanosheets, which were further assembled with abundant nanoparticles. The gas-sensing properties of such porous nanowall NiO array film sensors were investigated with eight inorganic and organic gases. The H2S-sensing performance was observed to be in a large dynamic range (1 ppb to 100 ppm) and the lowest detection limit was 1 ppb at 92 degrees C compared with other reported oxide-based sensors. The sensor exhibited not only high sensitivity, good selectivity and reproducibility to H2S with resistance to humidity at a low temperature of 92 degrees C and room temperature, but also good linear relationship under concentration ranges of ppm level (1-100 ppm) and ppb level (1 ppb to 1 ppm). The excellent sensing performance of this array film sensor to H2S could be ascribed to the porous structures in the unique nanowall arrays with a large specific surface area, which benefit H2S molecules to adsorb/desorb onto/from the array surface as well as the electron transfer. The formation of NiO arrays and their possible H2S-sensing mechanism are discussed in detail.

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