title: Multilayer films of layered double hydroxide/polyaniline and their ammonia sensing behavior.
abstract: 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.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, P.O. Box 98, Beijing 100029, PR China.
authors.forename: Dong-Mei
authors.initials: DM
authors.lastname: Xu
authors.forename: Mei-Yu
authors.initials: MY
authors.lastname: Guan
authors.forename: Qing-Hong
authors.initials: QH
authors.lastname: Xu
authors.forename: Ying
authors.initials: Y
authors.lastname: Guo
mesh_terms: D000641:Ammonia / Q000032:analysis*; D000814:Aniline Compounds / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D013056:Spectrophotometry, Ultraviolet; D014961:X-Ray Diffraction
chemical_list: D000814:Aniline Compounds; D006878:Hydroxides; C416807:polyaniline; D000641:Ammonia
keywords: Ammonia sensing; Layer-by-layer; Layered double hydroxide; Polyaniline