Gas sensing properties of p-type hollow NiO hemispheres prepared by polymeric colloidal templating method

Nam Gyu Cho, In Sung Hwang, Ho Gi Kim, Jong Heun Lee, Il Doo Kim

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)

Abstract

This work presents a simple and versatile route to produce macroporous p-type metal oxide thin films. Two-dimensional arrays of p-type NiO films with a hollow hemisphere structure were fabricated by colloidal templating and RF-sputtering followed by a subsequent heat treatment. The diameter and shell thickness of the NiO hemisphere were 800 nm and 20 nm, respectively. X-ray diffraction and high-resolution transmission electron microscopy analysis indicate that the pure NiO phase with grain size of 10 nm was obtained at calcination temperatures that exceeded 450 °C. Close-packed arrays of hollow NiO hemispheres were found to exhibit p-type gas sensing properties against (CO, H2, C3H8, CH4, NO2, and C2H5OH), leading to significantly enhanced responses to C2H5OH (Rgas/Rair = 5.0 at 200 ppm).

Original languageEnglish
Pages (from-to)366-371
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume155
Issue number1
DOIs
Publication statusPublished - 2011 Jul 5

Keywords

  • Colloidal template
  • Gas sensor
  • Hollow hemisphere
  • Nanostructure
  • Nickel oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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