Hybrid polyaniline–TiO₂ nanocomposite Langmuir–Blodgett thin films: Self‐assembly and their characterization

Abstract

Polyaniline (PANi)–titanium dioxide (TiO2) nanocomposite materials were prepared by chemical polymerization of aniline doped with TiO2 nanoparticles. Surface pressure–area (π‐A) isotherms of these nanocomposites show phase transformations in the monolayer during compression process. Multiple isotherms indicate that the monolayer of the nanocomposite material can retain its configuration during compression‐expansion cycles. Langmuir–Blodgett thin films of PANi–TiO2 nanocomposite were deposited on the quartz and indium tin oxide coated conducting glass substrates. Fourier transfer infrared spectroscopy and UV–visible spectroscopy study indicates the presence of TiO2 in PANi, whereas X‐ray Diffraction study confirmed the anatase phase of TiO2 and particle size (∼nm) of PANi–TiO2. The morphology of Langmuir–Blodgett films of these nanocomposites was also characterized by atomic force microscopy. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41386.

Growth, Morphology, and Electrical Characterization of Polyaniline–ZnO Nano-composite Langmuir–Blodgett Thin Films

“…This was much more than the 25 nm for the PANi LB film, which suggests that the ZnO nanoparticles (of size 50 nm) are embedded in the polymer chains and are deposited uniformly. The average molecular length of the PANi monomer, reported elsewhere, 26 is very small ($5 Å ) and polymerization of aniline on the surface of the ZnO nanoparticles results in an increase in the average height of the PANi-ZnO nano-composite LB film compared with that of PANi and ZnO nanoparticles. Moreover, after introduction of ZnO nanoparticles into the PANi matrix, the composite had a root mean square roughness of 4.5 nm and an average surface roughness of 3.4 nm.…”

“…Indium tin oxide (ITO)-coated glass was used as substrate for film deposition; before use the glass was cleaned with acetone, then ultrasonicated for approximately 30 min in 10% aqueous sodium hydroxide, and finally rinsed in deionised water for approximately 10 min. 26 Monolayers were deposited at a constant surface pressure by vertical dipping at 2.0 mm/min. Density, thickness, and homogeneity were preserved during transfer of the LB film on to the substrate.…”

SnO2/TiO2 Thin Film n-n Heterostructures of Improved Sensitivity to NO2

“…Therefore, in attempts to use this method in gas-sensing applications, organic compounds such as porphyrin [68,69], benzenedicarboxylic acids [70], and polypyrrole [71] have been most frequently employed. Formation of TiO 2 or SnO 2 thin films is often associated with using precursors of metal oxides, e.g., titanium alkoxides [72], polianiline-TiO 2 [73] or complexes of metal salts of fatty acid or amines, e.g., ODA-stannate complexes [74], or ODA-KTiO 2 [75]. Obtained films are then subject to a thermal decomposition which removes the organic part.…”

Effects of silver nanoparticles doping on morphology and luminescence behaviour of ferroelectric liquid crystals Langmuir–Blodgett films

“…Because films of soft materials can get damaged during contact or intermittent mode. [39][40][41][42][43][44][45][46][47][48][49][50] Conditions applied for imaging are described in experimental section. AFM image of DDT-Ag nanoparticles deposited at 29 mN m -1 on silicon substrate in the scan range of 5 × 5 µm 2 is shown in Figure 5.…”