Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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In-decorated NiO Nanoigloos Gas Sensor with Morphological Evolution for Ethanol Sensors

  • Yi, Seung Yeop (Center for Electronic Materials, Korea Institute of Science and Technology (KIST)) ;
  • Song, Young Geun (Center for Electronic Materials, Korea Institute of Science and Technology (KIST)) ;
  • Kim, Gwang Su (Center for Electronic Materials, Korea Institute of Science and Technology (KIST)) ;
  • Kang, Chong-Yun (Center for Electronic Materials, Korea Institute of Science and Technology (KIST))
  • Received : 2019.07.23
  • Accepted : 2019.07.31
  • Published : 2019.07.31
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Abstract

We investigated the facile and effective strategy for sensitive and selective $C_2H_5OH$ sensors based on the In-decorated NiO nanoigloos. The In-decorated NiO nanoigloos is fabricated by RF sputtering using 750 nm-diameter polystyrene beads using a soft-template. The morphological evolution based on the Van der Drift model was generated through a heterojunction between In metal and NiO, resulting in a pyramidal rough surface. Upon decorating the In on the NiO surface, high sensitivity and selectivity to $C_2H_5OH$ were observed, and gas sensing mechanism was demonstrated by a high surface-to-volume and double Schottky barrier. We are confident that the method presented in this study will have a significant impact on the fabrication of effective nanostructures and their application for the gas sensors.

Keywords

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Fig. 1. Schematic of fabrication procedures of In-decorated NiO nanoigloos.

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Fig. 2. SEM images of (a) PS beads, and the (b) bare and (c) In-decorated NiO nanoigloos. Cross-sectional images of (b) and (c) are (d) and (e), respectively. (f) XRD of bare and In-decorated NiO nanoigloos.

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Fig. 3. Response transients of the (a) bare and (b) In-decorated NiO nanoigloos to 5 ppm C2H5OH as a function of operating temperature from 250 to 400 ℃. (c) Response as a function of operating temperature from 250 to 400 ℃. Response of the (d) bare and (e) In-decorated NiO nanoigloos to 5 ppm C2H5OH at 300 ℃. (f) Polar plots depicting responses to various gases (5 ppm) at 300 ℃.

HSSHBT_2019_v28n4_231_f0004.png 이미지

Fig. 4. Schematic illustrations of (a) stepwise C2H5OH sensing procedure in the near surface region; (b) the scheme of double Schottky barrier model.

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