Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 262, Issue -, Pages 64-70Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2013.08.034
Keywords
Layered double hydroxide; Polyaniline; Layer-by-layer; Ammonia sensing
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Funding
- National Natural Science Foundation of China [21001014]
- Beijing Natural Science Foundation [2113049]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1205]
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This paper reports the fabrication of layered double hydroxide (LDH)/conductive polymer multilayer films by alternate assembly of exfoliated ZnAl-LDH nanosheets and polyaniline (PANI) on silicon wafer substrates using the layer-by-layer (LBL) deposition technology. UV-vis absorption spectroscopy indicates a stepwise and regular growth of the (LDH/PANI)(n) multilayer films upon increasing deposition cycles. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) demonstrate that the surfaces of the films are microscopy smooth and uniform with a thickness of 2 nm per bilayer. Furthermore, the resulting (LDH/PANI)(n) multilayer films possess high selectively response to ammonia at room temperature. The presence of LDH nanosheets plays a critical role on the gas sensing for the pure PANI film has very low response to ammonia. The LBL assembly process based on LDH combines the conducting polymer and nano-inorganic material, which provides opportunities to develop new inorganic-organic films for gas sensing. (C) 2013 Elsevier B.V. All rights reserved.
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