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Broadband photodetector based on 3D architect of MoS2-PANI hybrid structure for high photoresponsive properties
摘要： MoS2-PANI hybrid structure were synthesized by insitu polymerization of hydrothermally synthesized MoS2 nanosheets with PANI for its application in photodetectors. Field-Emission Scanning Electron Microscopy (FESEM), High-Resolution Transmission Electron Microscopy (HRTEM), X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and UV-vis spectroscopy and were performed to characterize the synthesized sample. The optical sensor of MoS2-PANI nanosheets were fabricated and altogether studied using laser excitation wavelengths (λex): 635 nm (red), 785 nm (infra-red) and 1064 nm (near infra-red). The evaluated value of photoresponsivity of hybrid structure is quite high compared to the previously reported MoS2 nanosheets based optical sensor. At 785 nm, maximum photoresponsivity of 25 A/W is observed at fixed power density of 1.4 mW/mm2. The photoresponsive characteristics of MoS2-PANI hybrid structure were examined as a function of optical power density.
关键词： Photoresponsivity.,MoS2-PANI,Hydrothermal
更新于2025-11-21 11:01:37
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A high-performance room temperature methanol gas sensor based on alpha-iron oxide/polyaniline/PbS quantum dots nanofilm
摘要： A high-performance room temperature methanol gas sensor based on alpha-iron oxide/polyaniline/lead sulfide quantum dots (α-Fe2O3/PANI/PbS QDs) nanofilm was demonstrated in this paper, among which the α-Fe2O3 was an urchin-shaped hollow microsphere. The sensing film was fabricated on an epoxy substrate with interdigital electrodes via successive ionic layer adsorption and reaction technique. The prepared α-Fe2O3/PANI/PbS QDs nanocomposite was examined by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, scanning election microscopy and Fourier transform infrared spectrum. The methanol sensing performances of the α-Fe2O3/PANI/PbS QDs film sensor were investigated against methanol from 10 to 100 ppm at room temperature. The experimental results indicated that the methanol sensor in this work had an excellent response, outstanding selectivity and good repeatability at room temperature. The underlying sensing mechanism of the α-Fe2O3/PANI/PbS QDs film toward methanol was ascribed to a series of interactions and changes on the surface of thin films, which make their resistance change greatly. Larger surface area and much more active adsorption sites also played an important role.
关键词： Methanol gas sensor,Room temperature,Successive ionic layer adsorption and reaction,Hydrothermal method,α-Fe2O3/PANI/PbS QDs
更新于2025-11-14 17:15:25
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Free Exciton Absorptions and Quasi-reversible Redox Actions in Polypyrrole–Polyaniline–Zinc Oxide Nanocomposites as Electron Transporting Layer for Organic Light Emitting Diode and Electrode Material for Supercapacitors
摘要： The ternary nanocomposite comprised of PPY–PANI (polypyrrole–polyaniline) copolymer and zinc oxide (ZnO), synthesized by implying chemical oxidative polymerization of pyrrole monomer in presence of ammonium persulfate as oxidant with varying ZnO concentrations. The shifting of bands and their corresponding change in nano-strain of as-prepared PPY–PANI–ZnO nanocomposite of varying concentration was confirmed by the Fourier transform inferred spectroscopy (FTIR). The surface morphological images of PPY–PANI–ZnO nanocomposites revealed the nano-flake like structure attributed to the embodiment of ZnO and increase in agglomeration was detected with the increasing concentration of ZnO. The optimized reduction in band gap up to ~ 1.02 eV and red-shift of absorption edge of ZnO in visible region side was detected for 10% PPY–PANI–ZnO nanocomposite. The relatively slow decay component and higher non radiative electron–hole recombination rate showed the better electron transport properties with chromaticity in ideal blue region for 10% PPY–PANI–ZnO nanocomposite. The higher current density ~ 7.95 A/cm2, high dielectric constant ~ 1960 at 373 K, high reduction potential ~ + 0.687 V with high specific capacitance (~ 436.14 F/g) at 10 mV s?1 and better thermal firmness was observed for 10% PPY–PANI–ZnO nanocomposite. The relatively high discharge time ~ 2600 s and high power density with meagre loss in energy density at high current density was also observed for 10% PPY–PANI–ZnO nanocomposite. These robust properties confirmed that the proposed 10% PPY–PANI–ZnO nanocomposite could be employed as electron transporting material for OLEDs as well as for high performance and efficient supercapacitors.
关键词： PPY–PANI–ZnO nanocomposites,Electrochemical performance,Chemical oxidative polymerization,PL,Electron transport layer
更新于2025-09-23 15:23:52
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Enhanced degradation of BPA in water by PANI supported Ag/TiO2 nanocomposite under UV and visible light
摘要： PANI supported Ag@TiO2 nanocomposite was synthesized via oxidative polymerization of aniline on Ag@TiO2. The Ag@TiO2 nanocomposite was synthesized by the photo reduction of Ag nanoparticles on hydrothermally synthesized TiO2 nanofibers. Raman analysis revealed that the anatase phase of TiO2 was synthesized showing typical peaks at 195 cm-1, 396 cm-1, 514 cm-1, and 637 cm-1. The incorporation of PANI, a carbonaceous material was confirmed by appearance of D-band and G-band in Ag@TiO2-PANI that were located at 1505 cm-1 and 1603 cm-1 respectively. X-ray diffraction (XRD) analysis confirmed the anatase phase of TiO2 was synthesized. Transmission electron microscopy analysis (TEM) analysis revealed that TiO2 nanofibers were synthesized successfully and Ag nanoparticles of different sizes were deposited on their surface. X-ray Photon Spectroscopy (XPS) survey scan of the Ag@TiO2-PANI-nanocomposite revealed that the nanocomposite was made from C, O, Ag, Ti, and N. DRS and Tauc`s plot estimated the band gap of Ag@TiO2-PANI to be 3.0 eV. A comparative study of the photocatalytic performance of Ag@TiO2-PANI catalyst showed better degradation performance under both conditions than pristine TiO2, and Ag@TiO2 with a degradation of up to 99.7% under visible light irradiation. The degradation experiments showed that the reactive species that were dominant in the degradation of BPA were h+ and .O2-. The nanocomposite was re-used to degrade BPA for up to four cycles without losing much of its photocatalytic ability with a removal of at least 90% in the fourth cycle.
关键词： Bisphenol A,Ag@TiO2-PANI,visible light,X-ray photoelectron spectroscopy,UV
更新于2025-09-23 15:22:29
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Optoelectronically suitable graphene oxide-decorated titanium oxide/polyaniline hybrid nanocomposites and their enhanced photocatalytic activity with methylene blue and rhodamine B dye
摘要： Organic–inorganic photocatalytic hybrid nanocomposites based on titanium oxide nanoparticle and polyaniline decorated with graphene oxide were synthesized via in situ chemical oxidative method using ammonium persulphate as an initiator and different weight percentages of TiO2 nanoparticles. The materials were characterized by using conventional techniques like UV–vis spectroscopy, FT-IR spectroscopy and X-ray diffraction. The electrical conductivity of the nanocomposites was found in the range of semiconducting materials. The nanocomposites possess broad application prospects covering the field of semiconducting devices, solar cells, sensors, microwave-absorbing materials and so on. The nanocomposites also exhibit promising photocatalytic activity towards degradation of methylene blue (MB) and rhodamine B dye in the presence of UV-light radiation. Compared to pure PANI and TiO2 nanoparticles, the GO/PANI/TiO2 nanocomposite showed much improvement in degradation efficiency. Significant photodegradation was observed with the molecules where 98.9% degradation was noted with 20% of TiO2 nanoparticles within 1 h under short-wavelength UV-light.
关键词： Fluorescence emitter,Photocatalysis,Optoelectronics,GO/PANI/TiO2 nanocomposite,TiO2 NPs,Semiconductor
更新于2025-09-23 15:21:01
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Enhanced photoelectrochemical performance of plasmonic Ag nanoparticles grafted ternary Ag/PaNi/NaNbO3 nanocomposite photoanode for photoelectrochemical water splitting
摘要： In this work, we have successfully synthesized silver nanoparticles (Ag-NPs) decorated binary PaNi/NBO nanocomposite by facile chemisorption route and demonstrated enhanced photoelectrochemical (PEC) water splitting activity. The ternary Ag/PaNi/NBO nanocomposite photoanode exhibits ~5 fold higher current density than pristine NaNbO3 nanofibers (NBO-NFs). The ternary Ag/PaNi/NBO photoanode exhibits a current density of 5.93 mA/cm2 at 0.9 V with respect to Ag/AgCl, whereas the pristine NBO-NFs photoanode exhibits only 0.85 mA/cm2 at 0.9 V. The improved performance is correlated to the high surface area, formation of the type-II heterojunction among PaNi and NBO-NFs and the introduction of the plasmonic behaviour of Ag-NPs as it expands the absorption of the visible part of the solar spectrum, which together decreases the recombination of charges with strong redox capability. Furthermore, the ternary Ag/PaNi/NBO photoanode showed lower charge transfer resistance (Rct) in the EIS measurements and improved incident photon to current efficiency (IPCE) of ~31.3% which is ~23% higher to the IPCE of bare NBO-NFs photoanode. Thus, these results suggest that the ternary Ag/PaNi/NBO nanocomposite is a promising material for PEC activity and wide practical applications.
关键词： Water Splitting,Silver nanoparticle,PaNi,NaNbO3,Ag/PaNi/NBO
更新于2025-09-23 15:19:57
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Evaluation of solution processable polymer reduced graphene oxide transparent films as counter electrodes for dye-sensitized solar cells
摘要： This paper reports the synthesis of reduced oxide (RGO) coated polyaniline (PANi) nanocomposites via in-situ emulsion polymerization and its application as counter electrode for dye sensitized solar cells (DSSCs). The synthesized nanocomposites were systematically characterized through Scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform resonance infra-red (FTIR) and Raman spectroscopy indicating the uniform intercalation of polyaniline with reduced graphene oxide. The synergy between RGO and PANi chains owing to the co-doped SDS and H2SO4 leads to the enhanced solubility and improved electrocatalytic activity, that was further confirmed through electrochemical measurements to satisfy the criteria for application as cost effective counter electrode material for scalable DSSC. The fabricated CE was highly transparent and reached the conversion efficiency which is comparable to that of Platinum with a current density of (12.58 mA. cm-2) and (13.11 mA. cm-2) respectively under an illumination of AM 1.5 G (100 mW. cm-2) simulated solar light with an overall photo conversion efficiency of 3.9 %. Thus PANi/RGO based nanocomposites could therefore serve as efficient alternative material to Pt. free CE in DSSC.
关键词： In-situ emulsion polymerization,PANi,DSSC,counter electrode,reduced graphene oxide
更新于2025-09-23 15:19:57
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Efficient and stable photocatalytic reduction of aqueous hexavalent chromium ions by polyaniline surface-hybridized ZnO nanosheets
摘要： ZnO/PNAI nanocomposites were obtained via a simple two-step method, in which a hierarchically ?ower-like ZnO, assembled from nanosheets, was ?rst synthesized by low temperature (80 °C) solution method without surfactant/template and then, an in-situ polymerization of aniline onto the ZnO nanosheets was carried out. The characterization was actualized on the synthesized nanocomposite using XRD, Raman, TG-DSC, UV–vis-DRS, PL, XPS, SEM, TEM and N2 adsorption-desorption analysis. An ef?cient and stable photocatalytic activity was exhibited by the synergistic ZnO/PNAI nanocomposites on the reduction of toxic Cr(VI) to benign Cr(III) in comparison with the pristine ZnO and other semiconductor/PANI materials reported. The in?uence of parameters such as solution pH, initial Cr(VI) concentration and the addition of organic sacri?ces on the Cr(VI) removal ef?ciency was investigated. It was found that the Cr(VI) removal was strongly pH-dependent and the optimum pH range was 4–7 for ZnO/PANI composite catalyst. The Langmuir–Hinshelwood kinetic examination showed that the surface photoreaction was the rate-determining step to compare the adsorption equilibrium. The organic additives such as EDTA and citric acid can promote the photocatalytic ef?ciency and the solution of EDTA/HCl can well restore the photoreduction ability of ZnO/PANI catalyst. Moreover, the reusability of photocatalyst was also tested to estimate the practicability.
关键词： ZnO/PANI nanocomposites,Photocatalytic reduction,Hexavalent chromium,Synergistic effect
更新于2025-09-19 17:15:36
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Core-Double Shell Nano-hybrids Designed by Multi-walled Carbon Nanotubes, Polyaniline and Polythiophenes in PBDT-DTNT:PC61BM Solar Cells
摘要： Core–mantle–shell supramolecules composed of carbon nanotube (CNT)-graft-polyaniline (PANI), poly(3-hexylthiophene) (P3HT), and poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT) precursors were designed and utilized in PBDT-DTNT:phenyl-C61-butyric acid methyl ester (PC61BM) solar cells. Weight ratio of polymer:CNT-graft-PANI was 9:1 and the weight ratios were 1:1 in binary and 1:1:1 in ternary systems. Diameters of core(CNT)–mantle(PANI), core(CNT)–mantle(PANI)–shell(P3HT), and core(CNT)–mantle(PANI)–shell(PBDT-DTNT) nanostructures ranged in 75–90 nm, 145–160 nm, and 120–130 nm, respectively. Efficacies of 6.82% (13.92 mA/cm2, 0.71 V, 69%, 7.1 9 10?3 cm2/V s and 1.9 9 10?2 cm2/V s) and 7.60% (14.66 mA/cm2, 0.73 V, 71%, 9.0 9 10?3 cm2/V s and 3.4 9 10?2 cm2/V s) were acquired for photovoltaics based on the nanostructures having PBDT-DTNT and P3HT shells, respectively. The PANI mantle may act as both acceptor (accepting the electrons from core) and donor (donating the electrons to shell) in the configuration of core–mantle–shell supramolecules. The P3HT shells acted better than the PBDT-DTNT ones, originated from the simple structure of P3HT backbones and their more ordered and thicker shells, and thus had larger charge mobilities and currents.
关键词： core–mantle–shell,photovoltaic device,PANI,PBDT-DTNT,P3HT
更新于2025-09-19 17:13:59
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Synthesis of polyaniline/electrochemically exfoliated graphene composite as counter-electrode in dye-sensitized solar cell
摘要： Polyaniline (PANI)/graphene composite is a good candidate for the counter-electrode in a Pt-free DSSC. In this study, the electrochemically exfoliated graphene (EEG) from the used-battery graphite rod was produced. DC measurement reveals that EEG has a relatively low sheet resistance of 502.72 Ω/square. EEG suspension in DMF was used as synthesis media of PANI/EEG composite using the direct mixing method. Raman spectra show that the PANI/EEG composite was successfully synthesized as indicated by the presence of their characteristic peaks. Current density-voltage (J-V) measurements show that the power conversion efficiency of PANI/EEG composite better than the PANI-based counter-electrode.
关键词： PANI/graphene composite,polyaniline,counter-electrode,Pt-free DSSC,electrochemically exfoliated graphene
更新于2025-09-19 17:13:59