WO3 nanolamella gas sensor: Porosity control using SnO 2 nanoparticles for enhanced NO2 sensing

Tetsuya Kida, Aya Nishiyama, Zhongqiu Hua, Koichi Suematsu, Masayoshi Yuasa, Kengo Shimanoe

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

Tungsten trioxide (WO3) is one of the important multifunctional materials used for photocatalytic, photoelectrochemical, battery, and gas sensor applications. Nanostructured WO3 holds great potential for enhancing the performance of these applications. Here, we report highly sensitive NO 2 sensors using WO3 nanolamellae and their sensitivity improvement by morphology control using SnO2 nanoparticles. WO 3 nanolamellae were synthesized by an acidification method starting from Na2WO4 and H2SO4 and subsequent calcination at 300 °C. The lamellae were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), which clearly showed the formation of single-crystalline nanolamellae with a c-axis orientation. The stacking of each nanolamella to form larger lamellae that were 50-250 nm in lateral size and 15-25 nm in thickness was also revealed. From pore size distribution measurements, we found that introducing monodisperse SnO2 nanoparticles (ca. 4 nm) into WO3 lamella-based films improved their porosity, most likely because of effective insertion of nanoparticles into lamella stacks or in between assemblies of lamella stacks. In contrast, the crystallite size was not significantly changed, even by introducing SnO2. Because of the improvement in porosity, the composites of WO3 nanolamellae and SnO2 nanoparticles displayed enhanced sensitivity (sensor response) to NO2 at dilute concentrations of 20-1000 ppb in air, demonstrating the effectiveness of microstructure control of WO3 lamella-based films for highly sensitive NO2 detection. Electrical sensitization by SnO2 nanoparticles was also considered.

Original languageEnglish
Pages (from-to)2571-2579
Number of pages9
JournalLangmuir
Volume30
Issue number9
DOIs
Publication statusPublished - Mar 11 2014

Fingerprint

lamella
Chemical sensors
Porosity
Nanoparticles
porosity
nanoparticles
sensors
gases
Acidification
Sensors
Crystallite size
Crystal orientation
sensitivity
Calcination
Pore size
Tungsten
roasting
assemblies
electric batteries
insertion

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

WO3 nanolamella gas sensor : Porosity control using SnO 2 nanoparticles for enhanced NO2 sensing. / Kida, Tetsuya; Nishiyama, Aya; Hua, Zhongqiu; Suematsu, Koichi; Yuasa, Masayoshi; Shimanoe, Kengo.

In: Langmuir, Vol. 30, No. 9, 11.03.2014, p. 2571-2579.

Research output: Contribution to journalArticle

Kida, Tetsuya ; Nishiyama, Aya ; Hua, Zhongqiu ; Suematsu, Koichi ; Yuasa, Masayoshi ; Shimanoe, Kengo. / WO3 nanolamella gas sensor : Porosity control using SnO 2 nanoparticles for enhanced NO2 sensing. In: Langmuir. 2014 ; Vol. 30, No. 9. pp. 2571-2579.
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