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FTIR spectra of synthesised rGO, PANI polymer and composites AJC1 (rGO/Li2CO3::80:20), AJC2 (rGO/PANI/Li2CO3::60:20:20), AJC3 (rGO/PANI/Li2CO3::40:40:20), AJC4 (rGO/PANI/Li2CO3::20:60:20) and AJC5 (PANI/Li2CO3::80:20)
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Reduced graphene oxide (rGO)/polyaniline (PANI) composites grabbed the interest of researcher towards the development of electrolyte material. In present research work, we have focused on the synthesis of rGO and PANI by chemical method. The composites are prepared using different amounts of rGO/PANI and lithium carbonate. The main objective is to...
Citations
... In pursuit of tunable optoelectronic applications, a remarkable class of versatile and promising nanomaterial, carbon dots has emerged with great future prospects [1]. Carbon dots (CDs) are nanometer-sized carbon-based nanoparticles with significant optical, electronic, and surface properties [2]. ...
Optimizing the optoelectronic characteristics of low-dimensional carbon dots (CDs) through surface modifications and doping has proven instrumental in tailoring them for diverse applications. This study explores a facile and economical hydrothermal synthesis method for generating Carbonized Polymer Dots using o-phenylenediamine at different temperatures. The resulting materials exhibit structural and morphological variations linked to the synthesis temperature. A transition from carbon dots (CDs) embedded in reduced graphene oxide (rGO)-like sheet structures at low temperatures to the core-shell structure at the highest temperature is observed in HR-TEM, implying the formation of CPDs. X-ray photoelectron spectroscopy (XPS) corroborates these findings, showing an augmented degree of graphitization in alignment with HR-TEM results. The photoluminescence spectra of CPDs synthesized at the lowest temperature exhibit multiple emission peaks, resulting in a yellowish-orange color. Utilizing these CPDs to fabricate light-emitting diodes (LEDs) produces a vivid bright-green emission with CIE coordinates (0.378, 0.522). Moreover, the CPDs demonstrate solvatochromism across diverse solvents of varying polarity, covering the entire visible spectrum. This intriguing solvatochromic effect positions the CPDs as promising materials for polarity probing applications.
... The presence of both peaks GO and PANI con rmed the formation of the PANI /GO composites. [15,36,38] In the PANI/rGO composites, the absorption peaks at 3450, 1564 and 1477 cm − 1 should be assigned to the stretching vibration of -N-H group, quinoid ring (N = Q = N) and benzenoid ring (N-B-N), respectively [40]. ...
Polyaniline (PANI) as a known conducting polymer, exists in different forms, each having its properties and technological applications. PANI and PANI/Graphene Oxide (PANI/GO) composites with different compositions of GO were prepared by in-situ polymerization techniques. The synthesized PANI/GO composites were reduced to PANI/reduced Graphene Oxide (PANI/rGO) via in situ polymerization method. PANI/rGO composites were synthesized by ex-situ polymerization technique also. This research work attempts to do a comparative study of the synthesis and properties of graphene-based PANI nanocomposites. It has been characterized by X-Ray Diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR). The prime characteristic peaks from FTIR were analyzed and observed for the formation of nanocomposites. The anti-microbial properties of the polymer composites were investigated by the Agar well diffusion method using two gram-positive and two gram-negative bacteria – Bacillus, Staphylococcus, and Pseudomonas, Escherichia coli. Pristine PANI shows an inhibition zone in all bacteria than PANI/GO. PANI/rGO ex-situ has more antibacterial activity than PANI/rGO in-situ composite.
... The γ-band at ~2Ө degree originates from disorder in the sp 2 hybridized carbon and indicates lattice imperfection in the curve graphene sheets, spheres, and tube ends, etc. [32][33][34][35][36][37]. The comparatively low intensity of the γ-band in the XRD profile of the soot indicates that all the sources have a very low percentage of amorphous carbon. ...
A facile green synthesis for carbon nanoparticle production using Cinnamomum camphora (Camphor) is presented. Camphor upon carbonization and chemical oxidation leads to the formation of nano-carbon structures with lateral size 7.33nm to 4.14nm, respectively. The nanomaterial's stacking height is about 2.76nm and 3.10nm, leading to the formation of about 10 layers of carbon. The AFM analysis confirms that the graphene layer formed is wrinkled or folded. Developments of a layered structure with spheroids are observed on the sample's surface, confirming the graphitization of the amorphous carbon. The relative intensity of the defect to the graphite band is found to be 0.98 for the nanostructure indicating a lesser degree of defects. The C1s band of the nanostructure is deconvoluted to components at 284.7, 286.5, 287.3, and 289 eV, which are assigned to non-oxygenated ring carbon (sp 2 carbon), C in CO (bound to O either as epoxy or hydroxyl), C in C=O (of alcohols, phenols or ether), and C in C(O)O (carboxylic acid) respectively. The study reveals the formation of few-layer oxygenated carbon layers from the botanical hydrocarbon.
Blend polymer composite electrolyte (BPCE) films consisting of Polyvinyl alcohol (PVA)-Polyethylene glycol (PEG) with Sodium nitrate (NaNO3) and different weight percent of reduced graphene-oxide (rGO) were prepared by standard solution cast technique. The structural properties were analysed by the X-ray diffraction of the nanocomposite shows the uniform distribution of rGO in the polymer matrix and confirms the amorphous nature of the polymer blend composite films. FTIR studies clearly shows the confirmation of strong interaction between polymer, rGO (nanofillers) and Na-ion. The chemical bond formation spectrum or structure is analyzed by Raman spectroscopy to understand the chemical variation of the polymer composite, which confirm the presence of rGO in the composites. Thermal analysis DSC / TGA results show that the amount of rGO in the blend polymer matrix has a significantly improved the thermal stability of blend polymer composite films. The surface morphology of the as prepared films was analysed by field emission scanning electron microscope. The electrical properties of as prepared films show the highest ionic conductivity σ ∼10–6 S cm−1 in 30 wt.% based BPCE films (at 323 K). The dielectric properties of blend polymer composites films were measured over a wide frequency range of 10–1 to 107 Hz at two different temperatures, which illustrates the increment in a.c conductivity and dielectric permittivity of blend polymer composite films by adding the rGO contents. The performance of the electrochemical stability window was found up to (∼4.15 V vs.Na+/Na) and ionic transference numbers found ∼0.91 at room temperature. Ion transport mechanism is the key parameter and reveals better ion transportation in electrolytes during electrochemical analysis.
A microbial fuel cell is a biological electrochemical system that extracts electrons stored in organic matter by oxidation using catalytic properties of microorganisms at bioanode. The major problem in such device, is however limited power production due to slow kinetic of oxygen reduction at cathode. It is worthwhile to develop new materials that fulfil these requirements. The polymerization of aniline onto carbon cloth for effective electrodeposition of platinum nanoparticles has been carried out by chronoamperometry and cyclic voltammetry. Three materials were thus elaborated, namely pristine carbon cloth, carbon cloth modified with platinum and carbon cloth modified by polymerization of aniline for immobilization of Pt-nanoparticles. The FTIR spectroscopy analysis revealed characteristic band located in 1720–1650 cm⁻¹, attributed to imine function, main component in skeleton of polymer PANI chain. The modified materials have been utilized as cathode in cell inoculated with medicinal plant wastes for improvement of oxygen reduction. Modified cathode with CC-PANI-Pt proved higher performances in all respects: increase of cell voltage from 338 to 765 mV and power density from 862 to 1510 mW/m² and abatement of COD of microbial inoculum leachate to 88%. Another feature of cell with modified cathode CC-PANI-Pt, was the enormous electric charge density harvested upon oxidation of 1 mL of acetate 7.62 C/cm² compared to that of cell with pristine CC cathode 0.54 C/cm². Nevertheless, coulombic efficiency for conversion of medicinal plant wastes into bioenergy was relatively lower 9%, making in evidence that elaborated electrochemical device was rather efficient and benificial environmentally than energetically.
