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Synthesis, characterization, optical and electrochemical band gaps of green poly(azomethine-ester)s containing oxalyl and succinyl units
摘要： A new series of poly(azomethine-ester)s (PAZ-E)s with different (turning ortho, meta and para) positions were synthesized by condensation polymerization. The chemical structure of polymers was veri?ed by 1H-NMR, 13C-NMR, FTIR and UV–Vis measurements. Electrochemical characteristics of the corresponding polymers were obtained with cyclic voltammetric (CV) analysis. Thermal characteristics of the obtained polymers were analysed by TG-DTA, DMA and DSC measurements. The ?rst degradation temperature values of PAZ-E compounds were found between 198 and 250?C from TGA measurements. Photophysical characteristics of the obtained polymers were explained with photoluminescence (PL) spectroscopy. Molecular weight distributions of (PAZ-E)s were obtained by gel permeation chromatographic (GPC) analysis. Two- and three-dimensional (2D and 3D) properties and images of the synthesized (PAZ-E)s were analysed by SEM and AFM surface analysis techniques, respectively. Electrochemical band gap (E g) values of (PAZ-E)s P-9, P-10, P-11, P-12, P-13 and P-14 were calculated as 2.58, 2.14, 1.90, 2.06, 1.89 and 1.69 eV, respectively. The E g values of the (PAZ-E)s were found to be quite low.
关键词： surface morphologies,Poly(azomethine-ester),electrochemical properties,photophysical behaviour,schiff base,thermal degradation
更新于2025-11-14 15:26:12
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Electrochemical and surface deformation studies on electrodeposited nanostructured Bi2Te3 thin films
摘要： In this article, we have used double exposure digital holographic interferometry (DEDHI) technique for surface deformation study and hologram recording during synthesis of the Bi2Te3 thin films by electrodeposition method. The synthesized Bi2Te3 thin films were characterized structural, morphological, electrochemical, wettability and surface deformation study. Further the holograms are recorded during the electrodeposition process by varying the concentration of electrolyte. From the recorded fringes the stress, deposited mass and thickness have been calculated. It is observed that the fringe width, mass of deposited thin films, and stress to substrate changes with the concentration of electrolyte. The DEDHI technique is found more reliable for thickness measurement in electrodeposition process. The EIS study confirms that the deposited material is highly conducting.
关键词： Bi2Te3,EIS,Holography,DEDHI,Electrochemical properties,Electrodeposition
更新于2025-11-14 15:16:37
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Spherical LiZnBO3: Structural, Optical and Electrochemical Properties
摘要： Spherical – LiZnBO3 material is synthesized by sol-gel technique and the structural, optical, and electrochemical properties of LiZnBO3 are analyzed. X-ray diffraction result reveals the formation of α-LiZnBO3. Scanning electron microscope and transmission electron microscope image shows spherical morphology and the size of particle is approximetly 80 nm. Absorbance spectra reveal the characteristics band edge of LiZnBO3 is noticed around 210 nm and the band gap is found to be 5.57 eV. Defect-induced intrinsic luminescence is observed in the LiZnBO3 material. The calculated electrical conductivity of LiZnBO3 is 9.52 x 10-9 S/cm. Charge–discharge measurement indicates that the sol-gel synthesized LiZnBO3 delivers a first charge-capacity of 78.82 mAh g-1 at C/10 rate and yields the discharge capacity of 7 mAh g-1 at the 10th cycle. An improved capacity is expected to be reached by further reduction in particle size, doping and conductive carbon coating.
关键词： Sol-gel,Spherical,Optical and electrochemical properties,LiZnBO3
更新于2025-09-23 15:23:52
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Preparation and properties of Co3O4-doped TiO2 nanotube array electrodes
摘要： Co3O4-doped TiO2 nanotube array electrodes were prepared by anodizing the Co–Ti alloys with different Co contents. Morphologies, elemental compositions, crystal structures, and electrochemical properties of the samples were characterized through scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and electrochemical workstation. The effects of Co content, annealing temperature and testing electrolyte on the electrochemical properties of the electrodes were studied. Results show that the areal capacitance values of TiO2 nanotube arrays were obviously improved by doping with Co3O4. The electrochemical properties of Co3O4-doped TiO2 nanotube array electrodes were best when the Co content in the alloys was 9%; the annealing temperature was 100 °C and the testing electrolyte was 0.5 M Na2SO4. The Co3O4-doped TiO2 nanotube array electrodes prepared under the optimal conditions had a high areal capacitance value of 937.9 μF cm?2 when the scan rate was 10 mV s?1 and the electrodes exhibited good rate and superior cycling performance.
关键词： Co–Ti alloys,Electrochemical properties,Co3O4,Anodization,TiO2 nanotube arrays
更新于2025-09-23 15:22:29
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The Sonogel-Carbon-PEDOT Material: An Innovative Bulk Material for Sensor Devices
摘要： The synthesis of a new bulk material based on silicon oxide and poly-(3,4-ethylenedioxythiophene) (PEDOT), the Sonogel-Carbon-PEDOT material, is carried out. The main purpose is to obtain a bare conducting material, aided by statistical experimental design, able to be used as transducer for electrochemical devices. This new material tries also to solve out the degradation and fouling drawbacks related to PEDOT-based layer devices by simply polishing its surface in a gently way. The resulting Sonogel-Carbon-PEDOT material shows excellent electrochemical properties, renewable surface and stability by using simple, low cost, and versatile synthesis method. As far as we are concerned, this is the first time that this kind of bulk material is reported. The resulting material was characterized by different techniques: SEM, EDS and Raman spectroscopy. Sonogel-Carbon-PEDOT was also electrochemically characterized for the assessment of the electrochemical performance of the resulting sensor device. Ascorbic acid was selected as reference analyte, obtaining good sensitivity and limit of detection: 319.8 μA mM-1cm-2 and 6.42 μM, respectively, in the concentration range 0.01–3.45 mM. Furthermore, repeatability and reproducibility studies (RSD<3%), were also very satisfactory. Finally, the Sonogel-Carbon-PEDOT sensor was successfully applied to the determination of ascorbic acid in a pharmaceutical formulation and biological samples, obtaining good recovery percentage (95–105%).
关键词： electrochemical properties,sensor devices,Sonogel-Carbon-PEDOT,conducting polymers,ascorbic acid
更新于2025-09-23 15:22:29
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A highly efficient reduced graphene oxide/SnO2/TiO2 composite as photoanode for photocathodic protection of 304 stainless steel
摘要： A new photoanode RGO/SnO2/TiO2 nanocomposite material with a heterojunction structure was fabricated via hydrothermal method. The RGO/SnO2/TiO2 composite with different graphene content were prepared to explore optimal photoelectrochemical properties compared with pure TiO2. The morphology, structure and optical property of the obtained composite were characterized by TEM, FTIR, XRD and UV–vis. The photocathodic protection effect and anticorrosion properties of the nanocomposite for 304 stainless steel (304SS) were investigated by photocurrent density, open circuit potential, Tafel polarization curves and electrochemical impedance spectroscopy. The results show that compared with pure TiO2, the composite can provide an effective protection for 304SS not only under white light irradiation but also in the dark, and the optimal sample electrode potentials negatively shifted to ?590 mV under illumination. The possible photocathodic protection mechanism of the composite was also proposed.
关键词： Photocathodic protection,Corrosion resistance,Electrochemical properties,Graphene,Heterojunction
更新于2025-09-23 15:22:29
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Ionic liquid assisted wet chemical synthesis CdS quantum dots and their structural, morphological, optical, electrochemical, photocatalytic, antibacterial and hemocompatibility characterization
摘要： In this work, CdS quantum dots were fabricated through the ionic liquid assisted wet chemical method to investigate the structural, optical response, electrochemical behaviour, photocatalytic, hemocompatibility and antibacterial studies for optoelectronic devices, supercapacitors, photocatalytic and biological applications. The synthesis powder has confirmed the formation of the cubic structure of the CdS material using the powder XRD pattern. Further, the Raman and FT-IR studies have supported the formation of the CdS synthesis. The XRD data and TEM image were employed to examine the lattice parameters like crystallite size, crystalline nature, lattice constant, d-spacing and volume of the unit cell and particle size. The broad optical absorption has been seen in the visible portion in the optical spectra. Using the Tauc plot from the optical absorption spectrum data, the optical band gap value of CdS NPs is computed as 2.74 eV and proved to be a narrow band gap material. Examining the electrochemical properties of CdS NPs revealed the redox behaviour, using CV characterization. The effect of the Indigo carmine (IC) and Congo red (CR) dye on the optical absorption, degradation irradiation time and photocatalytic efficiency of CdS NPs have been discussed. Antimicrobial studies of CdS NPs have been investigated.
关键词： Semiconductor,Electrochemical properties,Photocatalyst,Antibacterial Properties,Optical properties
更新于2025-09-23 15:19:57
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Theoretical characterization of hexagonal 2D Be <sub/>3</sub> N <sub/>2</sub> monolayers
摘要： First-principles density functional theory (DFT) calculations are performed to assess the stability, geometric, mechanical, optical and electronic properties of monolayer graphene-like Be3N2. We find that Be3N2 is a large band gap semiconductor with small electron and hole effective masses, which may promote its use in nanoelectronic devices. Furthermore, the excellent thermal, dynamical, and mechanical stability makes it a material of the comparable caliber to that of graphene. In addition, the excellent electrochemical properties of Be3N2 makes it a unique material with the possible theoretical capacities of 974 mAh/g for Li, Na, and K. Moreover, Be3N2 can form bulk graphite-like layered structures with two different configurations, i.e. N2-N1 and N2-Be1. Finally, the derivatives of Be3N2 (Be3N2 nanoribbons) also possess direct band gaps which can finely be tuned to the desired level by geometry and morphology constraints. Based on these fascinating properties, Be3N2 and its derivatives can find a broad range of applications in nanoelectronics and battery technologies.
关键词： DFT calculations,Two-dimensional material,Nano-ribbons,Electrochemical properties,Electronic properties
更新于2025-09-19 17:15:36
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Zr <sub/>4</sub> -Substituted polyoxometalate dimers decorated by <scp>d</scp> -tartaric acid/glycolic acid: syntheses, structures and optical/electrochemical properties
摘要： In this article, two new tetra-Zr(IV)-substituted sandwich-type Keggin polyoxometalates functionalized by chiral D-tartaric acid and glycolic acid, K2H10[Zr4(H2O)2(μ-OH)(μ3-O)2(D-tartH)(GeW10O37)2]·27H2O (1, D-tartH4 = D-tartaric acid) and K2H10[Zr4(H2O)2(μ3-O)2(gly)2(GeW10O37)2]·32H2O (2, glyH2 = glycolic acid), have been synthesized under hydrothermal conditions and characterized by FT-IR spectra, elemental analysis, single-crystal X-ray structure analysis, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), ultraviolet-visible absorption spectroscopy (UV-vis) and cyclic voltammetry (CV). The structure analysis reveals that both 1 and 2 contain a [Zr4(H2O)2(μ3-O)2(GeW10O37)2] cluster. UV-vis spectra indicate that both compounds are a wide-gap semiconductor. In addition, compound 1 is a chiral Zr(IV)-substituted sandwich-type Keggin cluster because the D-tartH ligand is chiral and the Flack divisor of 1 is 0.00, showing non-linear optical properties. The cyclic voltammograms indicate that compounds 1 and 2 have good electrocatalytic activity in the reduction of H2O2.
关键词： Zr4-Substituted polyoxometalate dimers,optical properties,electrochemical properties,structures,syntheses,D-tartaric acid,glycolic acid
更新于2025-09-19 17:15:36
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Electrochemical performance of indium-tin-oxide-coated lossy-mode resonance optical fiber sensor
摘要： Analysis of liquids performed in multiple domain, e.g., optical and electrochemical (EC), has recently focus significant attention. Our previous works have shown that a simple device based on indium-tin-oxide (ITO) coated optical fiber core may be used for optical monitoring of EC processes. At satisfying optical properties and thickness of ITO a lossy-mode resonance (LMR) effect can be obtained and used for monitoring of optical properties of an analyte in proximity of the ITO surface. However, EC response of the ITO-LMR device to a redox probe has not been achieved for ITO-LMR sensor whereas it is generally observed for commercially available ITO electrodes. The changes in the response to a redox probe are typically used as a sensing parameter when EC label-free sensing is considered, so it is crucial for further development of combined LMR-EC sensing concept. In this work, we focus on enhancing the EC activity of the device by tuning ITO magnetron sputtering deposition parameters. Influence of the deposition pressure on the ITO properties has been the main consideration. Both optical and EC readouts in 0.1 M KCl containing such redox probes as 1 mM of K3[Fe(CN)6] or 1 mM 1,1′-Ferrocenedimethanol were discussed at different scan rate. The performed studies confirm that for optimized ITO properties the ITO-LMR sensor used as the EC electrode may also show excellent EC performance. The observed EC processes are quasi-reversible and diffusion-controlled. Moreover, for the devices, which offer improved EC response, an optical monitoring of the EC process is also possible. According to our best knowledge, fully functional combined optical and EC sensor, where optical effect is resonance-based and other than well-known surface plasmon resonance, is presented for the first time.
关键词： Electrochemical properties,Cyclic voltammetry,Optical properties,Lossy-mode resonance,Optical fiber sensor,Indium tin oxide,Magnetron sputtering
更新于2025-09-16 10:30:52