Polyaniline/Ag Composite Nanotubes Prepared through UV Rays Irradiation via Fiber Template Approach and their NH₃Gas Sensitivity

Abstract

Polyaniline(PANI)/Ag composite nanotubes have been successfully prepared using a suitable fiber as template in the presence of H4SiW12O40 (SiW12) and silver nitrate (AgNO3) as a dopant and an oxidant, respectively. The Ag nanoparticles dispersed in the PANI nanotubes are very uniform. The structure and morphology of the product are characterized by Fourier transform infrared (FT-IR) spectrum, X-ray diffraction (XRD) pattern, scanning electron microscope (SEM), and transmission electron microscopy (TEM) images. UV rays play an important role in the polymerization. A potential formation mechanism of the PANI/Ag composite nanotubes is suggested. The average inner diameter of PANI/Ag composite nanotubes is 170 nm, which is consistent with the diameter of the template. The high surface areas, small diameter, and porous nature of the PANI/Ag composite nanotubes give significantly better performance in both gas sensitivity and time response. Moreover, the introduction of metal into organic films is effective in promoting the chemiresistor sensitivity to NH3. The gas-response to NH3 gas is examined at room temperature. Meanwhile, the reversible circulation response change of PANI/Ag composite nanotubes has a reasonable reproducibility and has more potential applications in the area of sensor development.

Fabrication of silver nanoparticles/polyaniline composite thin films using Layer-by-Layer self-assembly technique for ammonia sensing

“…The prominent peaks at 2Â values of silver nanoparticles/polyaniline composite thin films are shown in 40.1 • , 44.8 • and 81.2 • representing the 1 1 1, 2 0 0, and 2 2 2 Bragg's reflection of the face centered cubic, FCC structure of silver. The XRD diffractrogram of silver nanoparticles which using polyaniline as the stabilizing agent was found agreement with the literature values [26][27][28][29] of each Ag nanoparticle production methods.…”

Metal-Polymer Nanocomposites: (Co-)Evaporation/(Co)Sputtering Approaches and Electrical Properties

“…Novel network nanocomposites are proved to possess unique charge transfer and electrocatalytic properties, due to the enhanced interfacial interaction between the polymer network and the loaded metallic particles [109][110][111][112][113]. In this framework, the incorporation of metal NPs into CPs and the decoration of nanostructured CPs with metal NPs are considered good methodologies to enhance the sensitivity, response time and stability of chemical sensors and biosensors [114][115][116][117][118]. For example, nanocomposite thin film and nanowires formed by CPs in conjunction with the metal NPs have shown extraordinary chemical and biochemical sensing efficiency in revealing many types of analytes.…”

“…For example, nanocomposite thin film and nanowires formed by CPs in conjunction with the metal NPs have shown extraordinary chemical and biochemical sensing efficiency in revealing many types of analytes. In synthesis, the increase of the specific area and catalytic efficiency due to the metal NP and CP combinations are the key advantages for metal/conducting polymer as chemisensors and biosensors [116][117][118].…”

Molecular structure, optical, electrical and sensing properties of PANI-based coatings with silver nanoparticles deposited from the active gas phase

“…The ammonia gas deserves special attention due to its wide industrial application and high toxicity [1][2][3][4][5][6][7][8][9][10]. Among the various methods of NH 3 analysis, such as deep UV and near IR absorption spectroscopy [2], colorimetric methods [3], and the special attention is paid to the conductometric gas sensors [4][5][6][7][8][9][10], due to the simple and reliable detection system, high accuracy and reproducibility of the obtained values. The metal oxides (SnO 2 , WO 3 and etc.,) [4], conductive polymers polyaniline (PANI), polypyrrole [5], as well as composite systems based thereon [6] are traditionally used as an active sensitive layer of such sensors.…”

“…The metal oxides (SnO 2 , WO 3 and etc.,) [4], conductive polymers polyaniline (PANI), polypyrrole [5], as well as composite systems based thereon [6] are traditionally used as an active sensitive layer of such sensors. The nanostructured thin coatings, nanofibers, nanowhiskers and nanoparticles of the mentionedabove components [5][6][7], as well as the application of the carbon nanotubes nanostructures [8], graphene [9], metal nanoparticles (Ag) [10] used for detecting ammonia have been actively studied nowadays with the purpose to increase sensitivity, selectivity, response time reduction and restoration of the gas sensor. Besides, the major advantage of the nanostructured sensors including the sensors based on conductive polymers is their functionality at room temperature, what allows constructing miniature sensors with very low power consumption.…”