Preparation and properties of polyaniline‐silver composite by glucose reduction

Ag nanoparticles (Ag NPs) nanocomposites are promising catalysts for nitro compound reduction, but simultaneously meeting the requirements of high catalytic activity, stability, recyclability and facile preparation is highly difficult. Herein, the three‐dimensional (3D) porous magnetic polyaniline (PANI) was synthesized using phytic acid (PA) as the dopant/crosslinker, and a recyclable PANI/Ag NPs nanocomposite (PMPA) was obtained through the in situ redox between PANI and AgNO3. Characterization results demonstrate that PMPA exhibits a typical 3D porous structure constructed by coral‐like PANI framework with well‐dispersed Ag NPs (10–20 nm) firmly anchored. The PMPA can efficiently catalyze the 4‐nitrophenol (4‐NP) reduction, with a reaction rate constant of 9.5 × 10−3 s−1 (and 1067.4 s−1 g−1), which is highly competitive to the previously reported high‐performance Ag NPs catalysts. This is probably due to the favorable mass/electron conduction of 3D porous structure and strong interaction between PA and Ag. Moreover, the magnetism renders PMPA recyclability via a simple magnetic attraction, and the reaction rate constant remains at a high level after six reuse cycles, up to 4.8 × 10−3 s−1. This work highlights the important role of 3D porous PANI in structure of Ag NPs nanocomposites, and paves a new way to develop recyclable catalysts with facile preparation and high catalytic performance.Highlights Facile synthesis via in situ reaction between 3D porous PANI and AgNO3. Stable dispersion and strong anchor attributed to phytic acid. Conductive porous structure to facilitate mass/electron transportation. Outstanding catalytic performance for 4‐NP reduction and recycle by magnetism.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Three‐dimensional porous magnetic polyaniline supported Ag nanoparticles nanocomposites as an efficient and recyclable catalyst for nitrophenol reduction

Huang,

Li,

Zhang

et al. 2023

“…6,10 PANI, a semiconductive polymer, attracts attention due to the medium band gap and controllable electrochemical behavior 11 and also acts as an excellent host for metal and semiconductor nanoparticles. 12 PANI is usually preferred in applications such as biosensors, bioimaging, anticorrosion coatings, energy storage devices, soft electronics, and photocatalysis due to NH groups in its chains. 7,[13][14][15][16][17] Recently, the nanocomposites composed of PANI and inorganic components, such as metal or metal oxide, [18][19][20] graphene oxide (GO), 21,22 and boron nitride (BN), 23,24 etc., have attracted considerable attention from researchers as they exhibit unpredictable hybrid advantages derived synergistically.…”

Section: Introductionmentioning

confidence: 99%

“…Various conductive polymers, polythiophene, copper (Cu) phthalocyanine, polypyrrole (PPy), polyaniline (PANI), etc., have been used as fillers to maintain the flexibility of the matrix 6,10 . PANI, a semi‐conductive polymer, attracts attention due to the medium band gap and controllable electrochemical behavior 11 and also acts as an excellent host for metal and semiconductor nanoparticles 12 . PANI is usually preferred in applications such as biosensors, bioimaging, anti‐corrosion coatings, energy storage devices, soft electronics, and photocatalysis due to NH groups in its chains 7,13–17 .…”

Section: Introductionmentioning

confidence: 99%

Design of dual‐conductive polyacrylonitrile‐based composite nanofiber: Synergistic effect of copper nanoparticles decorated‐boron nitride and polyaniline

Orhun,

Doğan,

Erdem

et al. 2023

Conductive composite nanofibers are promising materials, especially wearable strain sensors, due to their lightweight, breathability, flexibility, and skin affinity. Here, we propose a dual‐conductive network by the sequential decoration of amin‐modified boron nitride nanosheets (BN), copper nanoparticles (Cu), and polyaniline (PANI) into the elastic thermoplastic polyacrylonitrile (PAN) nanofiber. The Cu nanoparticles/BN‐enwrapped PANI nanocomposite was synthesized using successive environmentally friendly reduction and chemical oxidation polymerization. First, Cu (II) ions were immobilized on modified BN and reduced with L‐ascorbic acid (BN@Cu), followed by a chemical oxidation polymerization of aniline using ammonium persulfate as an initiator (BN@Cu/PANI). The XRD (X‐ray diffraction), FTIR (Fourier Transform Infrared Spectroscopy), SEM (Scanning Electron Microscopy), and TEM/EDXS (Transmission Electron Microscopy/Energy Dispersive X‐ray Spectroscopy) analysis confirmed the coexistence of the BN@Cu/PANI phase and composition. The DC electrical conductivity of BN@Cu/PANI nanocomposite (0.567 S/cm) was quietly higher than PANI (0.167 S/cm) and BN@Cu (0.077 S/cm). The thermal conductivity of BN@Cu and BN@Cu/PANI was 0.626 and 0.444 W/mK, respectively. The BN@Cu/PANI loaded‐PAN composite nanofibers were successfully produced by electrospinning. SEM studies confirmed that the composite nanofibers have uniform fiber structure and suitable BN@Cu/PANI dispersion/distribution within the PAN. BN@Cu/PANI‐reinforced PAN nanofibers showed a 2‐fold decrease in the specific heat capacity and a 50‐fold increase in electrical conductivity of the nanofibers at 10 wt%BN@Cu/PANI loading. This work offers dual‐conductive polymer‐based composites, which can be used in thermal management applications in microelectronics devices.Highlights The dual‐conductive nanocomposite, BN@Cu/PANI, was prepared a simple, low‐cost method. BN@Cu/PANI, core/shell nanocomposite, was easily produced this way for the first time. BN@Cu nanoparticles increased the polymerization rate of PANI. The thermal and electrical conductivity of BN@Cu/PANI was 0.444 W/mK and 0.567 S/cm. Electrical conductivity of BN@Cu/PANI‐PAN increased 50‐fold increase at 10 wt%BN@Cu/PANI.

“…are not only used in nanoelectronic applications like EMI shielding, batteries, supercapacitors, sensors, etc. [3][4][5] but also gained prominence in non-electronic applications like water purification, 6 antibacterial protection, 7 redox catalyst, 8,9 etc. However, the properties as well as the performance of those conjugated polymer-based nanocomposites are mainly dependent on the morphology, particle size, composition, distribution within the polymer matrix, crystallinity, interfacial interactions, surface structures, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of preparation method on the structure, morphology, and conducting property of poly(m‐aminophenol)/silver nanocomposite

Priya,

Kar

2023

The aim is to create a nanocomposite with well‐defined morphology having enhanced electronic characteristics, suitable for a diverse range of applications including sensors, supercapacitors, and electrode materials, among others. A composite consisting of the functional conjugated polymer, such as poly(m‐aminophenol), combined with silver nanoparticles, can be fabricated by meticulously regulating its structure, morphology, and properties. In the current research, three different morphologies, viz., nanoparticles distributed, nanofibrous, and core–shell were obtained following three different methods of preparation. The nanocomposite with a uniform distribution of 5.15 wt% small silver nanoparticles exhibited the highest average DC conductivity of 1.3 × 10−4 S cm−1. However, the nanofibrous composite with 2.79 wt% silver loading and core–shell nanocomposite with 5.59 wt% silver loading were found to have poor conductivities in order of 10−7 S cm−1. The electronic conduction of the nanocomposites prepared in three different methods was correlated with the structural features of the polymer matrix and the interfacial interaction between the components. This suggests that the nanocomposites with uniform distribution of small silver nanoparticles hold high potential as electronic material for a wide range of applications.Highlights Optimization of preparation of poly(m‐aminophenol)/silver nanocomposite. Investigation of structure and morphologies of the composites. Morphologies—nanocomposites, nanofiber composite, and core–shell composite. Highest average DC‐conductivity of nanocomposite obtained as 1.3 × 10−4 S cm−1. Conductivity in order of 10−7 S cm−1 was observed for the other two nanocomposites.