In-situ packaging ultra-uniform 3D hematite nanotubes by polyaniline and their improved gas sensing properties

Journal Article · Thu Nov 15 00:00:00 EST 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.06.034· OSTI ID:22805270

Wang, Liwei; Fu, Hao ^[1]; Liu, Hongjie; Yu, Kefu; Wang, Yinghui ^[1]; Ma, Jianmin ^[2]

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1. School of Marine Sciences, Guangxi University, Nanning, 530004 (China)
2. School of Physics and Electronics, Hunan University, Changsha 410082 (China)

Highlights: • Ultra-uniform 3D α-Fe{sub 2}O{sub 3} nanotubes were packaged by PANI through the two-stage solution processes. • PANI/α-Fe{sub 2}O{sub 3}-based sensor could detect low concentration of acetone (1 ppm) at lower temperature of 180 °C. • The unique structure of α-Fe{sub 2}O{sub 3} support and its synergetic effect with PANI layers improved the sensor performances. - Abstract: This paper reports the PANI (polyaniline)-packaged three-dimensional (3D) α-Fe{sub 2}O{sub 3} nanotubes P/N heterojunction, which was constructed successfully though a facile hydrothermal reaction without adding any surfactant followed by in-situ chemical polymerization in the liquid phase. The structure and morphology of the products were characterized by means of FESEM, XRD, TEM & HRTEM, TGA and FT-IR. Gas sensing test results found that, the PANI/α-Fe{sub 2}O{sub 3} nanocomposite sensor exhibited obviously higher response, lower working temperature (180 °C), fast response and recovery speeds, good selectivity and excellent stability to acetone gas, indicating its promising application for high-performance acetone sensors. The enhanced gas sensing performances can be attributed to the factors like ultra-uniform 3D nanotube-like structure for α-Fe{sub 2}O{sub 3}, the noticeable advantages of PANI, as well as the construction of heterojunction barrier at their interface. The as-prepared PANI/α-Fe{sub 2}O{sub 3} nanocomposite may be also applied in other areas like photocatalysis, water purification, ion batteries, optical devices, and so on.

• OSTI ID: 22805270
• Journal Information: Materials Research Bulletin, Vol. 107; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ACETONE
ANILINE
CONCENTRATION RATIO
FOURIER TRANSFORM SPECTROMETERS
HEMATITE
HETEROJUNCTIONS
HYDROTHERMAL SYNTHESIS
IRON OXIDES
MORPHOLOGY
NANOCOMPOSITES
NANOTUBES
PHOTOCATALYSIS
POLYMERIZATION
SENSORS
SOLUTIONS
THERMAL GRAVIMETRIC ANALYSIS
THREE-DIMENSIONAL LATTICES
TRANSMISSION ELECTRON MICROSCOPY
WATER
X-RAY DIFFRACTION