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Enhanced piezoelectricity of a PVDF-based nanocomposite utilizing high-yield dispersions of exfoliated few-layer MoS2
摘要： Piezoelectric polymer composite ?lms have attracted extensive attention due to their comprehensive characteristics such as low cost, good ?exibility, mechanical property and excellent processability. Among the known polymers, poly (vinylidene ?uoride) (PVDF) is an ideal piezoelectric polymer because the β-crystalline form of PVDF has the highest polarization per unit cell. However, initial PVDF mostly su?ers from the lack of a β phase, restricting its potential applications. Few-layer MoS2 is predicted to be strongly piezoelectric owing to the opposite orientations of adjacent atomic layers. In this work, we report an e?cient approach to enhance the piezoelectric property of PVDF-based nanocomposites by combining few-layer MoS2 with PVDF. The product yield for few-layer MoS2 reached a value as high as 83.3% via a unique liquid-exfoliation technique. For a few-layer MoS2/PVDF composite ?lm with 1 wt.% few-layer MoS2, a high piezoelectric performance enhancement of 360% was achieved compared with the initial PVDF ?lm. In addition, due to the intrinsic lubrication of MoS2, the highest elongation of the piezoelectric composite ?lm was found to be four times higher than that of the pure PVDF ?lm.
关键词： Composite,Film,Piezoelectric performance,Few-layer
更新于2025-11-14 17:28:48
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Enhanced visible-light-driven photocatalytic activity of BiFeO3 via electric-field control of spontaneous polarization
摘要： Well-polarized BiFeO3 nanoparticles have been successfully prepared by a facile electrical poling method with the assist of a soluble organic-inorganic composite film. From XRD, TEM and SEM studies, no significant change in the crystal structure or morphology was detected after the electrical poling process. The visible-light driven photocatalytic process of poled BiFeO3 nanoparticles was accelerated by 2 times compared to unpoled BiFeO3. By combining time-resolved photoluminescence (PL), photoinduced silver deposition testing and photoelectrochemical measurements, it can be revealed that the enhanced photocatalytic performance of poled samples can be properly attributed to the promoted separation and prolonged lifetime of the photogenerated carriers caused by the ferroelectric polarization. These findings may offer a new route to promote the photocatalytic or photoelectric performances of BiFeO3 for advanced applications by adjusting the ferroelectric polarization.
关键词： BiFeO3 nanoparticles,Organic-inorganic composite film,Ferroelectric polarization,Electrical poling technology,Photocatalytic activity
更新于2025-11-14 15:24:45
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Reusable surface plasmon resonance sensor for rapid detection of Cu2+ based on modified-chitosan thin film as an active layer
摘要： In this article, a reusable surface plasmon resonance (SPR) sensor for rapid detection of copper ions (Cu2+), based on optimized silver/gold (Ag/Au) composite film modified by modified-chitosan (MCS) thin film as an active layer, was achieved. We employed a four-layer Kretchmann semi-cylindrical prism configuration and induced a reference beam into the experimental system to improve the sensitivity and stability, and investigated the cross-linking technique of CS solution, the spin coating process of MCS film, the stability of active layer, the rebirth power of SPR sensor, and the detection for trace Cu2+. The rate of swelling or dissolution of MCS film after flushing sensor chip for four times is less than 9×10?4/min, and the decline of signal value is less than 1.5% after MCS film adsorbing Cu2+ and multiple flushing. The elution and capacity rates are above 96% after five times of elution for the sensor by EDTA solution with 0.5mmol/L. Within 1-5ppm, the SPR sensor was found to possess sensitivity of 0.7271ppm?1. The LOD is 18ppb for the trace Cu2+. The present SPR sensor not only could be used in trace monitoring of Cu2+ but also could be extended to other potential applications.
关键词： Copper ions,Reutilization,Composite film,Modified-chitosan,Surface plasmon resonance
更新于2025-09-23 15:23:52
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A highly sensitive photocatalytic plastic optic-fiber sensor for selective detection of phenol in aqueous solutions
摘要： We present a highly sensitive photocatalytic plastic optic-fiber (POF) sensor for the selective detection of phenol in aqueous solutions. To obtain high sensitivity and low limit of detection (LOD) of the sensor, part of the POF cladding was removed and replaced by a Canada balsam doped with GeO2 (CBG); a UV-visible-light-driven photocatalytic material, that is a CdS-sensitized Er3+YAlO3/SiO2/TiO2 (EYST) composite, was coated on the CBG film. To realize highly selective detection of phenol in water, a high phenol permselectivity and pH independence polymer membrane was fixed on the CdS-sensitized EYST-CBG-coated POF. Furthermore, a model was developed to show that the phenol concentration can be determined by measuring the change in transmitted light intensity of the POF sensor and the sensitivity of the sensors can be improved by employing the CdS-sensitized EYST film. The results showed that the proposed photocatalytic POF sensor has a high sensitivity of -0.39 (mg·mL-1)-1 and low LOD of 15 μg·L-1 for the selective detection of phenol in aqueous solutions with pH ranging from 2.0 to 14.0.
关键词： Cds sensitization,Phenol concentration,High sensitivity and selectivity,Upconversion luminescence agent,Plastic optical fiber,TiO2 composite film
更新于2025-09-23 15:23:52
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Synthesis of Indium Sulfide/Zinc Oxide Composites Films and their Photocatalytic Activities
摘要： Indium sulfide and zinc oxide (In2S3-ZnO) films have successfully synthesized by doctor blading method coupling with low temperature precipitation-reflux rout. The weight ratio of In2S3 was varied from 0–70 wt.%. Physical characterization results obtained from various analytical techniques exhibit the well crystallinity phase of cubic β-In2S3 and wurtzite ZnO structure from XRD patterns. TEM micrograph of 35% In2S3-ZnO sample showed the small ZnO particles are embedded into β-In2S3. The obtained results exhibited the phase well crystallinity of cubic β-In2S3. A strong adsorption spectra shifted toward visible light region and the narrower optical band gap results of In2S3-ZnO composite films suggesting that synthesized samples could be used as the visible-light-driven photocatalyst. The photocatalytic activity of rhodamine B had been investigated over entire composite films under visible light illumination. It can be seen that the entire In2S3-ZnO composite catalyst films revealed degradation of rhodamine B performance obviously higher than pure ZnO and pure In2S3. Moreover, the highest photocatalytic activity was found from 35% wt. In2S3-ZnO film which showed 69.5% degradation within 4 h under visible light irradiation.
关键词： ZnO,β-In2S3,Composite film,Rhodamine B
更新于2025-09-23 15:22:29
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Microstructure and properties of honeycomb composite films containing Eu and Sn
摘要： Honeycomb composite films were prepared by breath figure method via a straightforward, one-step process by doping complex containing Eu or Sn into polystyrene-b-poly(acrylic acid) (PS-b-PAA) solution. Several influencing factors, such as the concentration of the block polymer solution, the relative humidity of the environment and the amount of complexes, were investigated to control micropore size and tune film surface properties. The characteristics of the composite films were studied by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), ultraviolet and emission spectra. Results indicate that composite films containing Eu have excellent optical performance, and micro-patterned bowl-like SnO2 microparticles could be fabricated from composite films containing Sn after being calcined at 600 °C for 5 h. This general approach for the fabrication of honeycomb composite films opens a convenient and effective route to the functional modification of honeycomb films and offers new prospects for the application in miniaturized sensors, micro-reactor and catalysis.
关键词： Complex containing Eu,Breath figure method,Honeycomb composite film,Tin dioxide,Microstructure
更新于2025-09-23 15:21:21
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Preparation of NiO/TiO2 Composite Films for Enhanced Dye Sensitized Solar Cell Efficiency
摘要： Spray pyrolysis technique has been applied for preparing many kinds of thin films because this technique offers a lot of advantages, such as inexpensive cost, uncomplicated process and large scale production. Therefore, the spray pyrolysis technique is used for making pure TiO2 and NiO/TiO2 composite films in this report. A NiO/TiO2 composite film is getting attention to be used as a compact layer in dye sensitized solar cell (DSSC) because NiO can be used as a hole collector and a barrier for energy recombination properties. Moreover, the NiO/TiO2 composite film exhibits superhydrophilic properties that can increase absorption efficiency for a dye solution. This study has an objective to improve the efficiency of DSSC by changing the ratio of NiO/TiO2 in the composite films. The pure TiO2 and NiO/TiO2 composite films were prepared at 200℃ by spray pyrolysis technique using a Ti(OCH(CH3)2)4 solution and a mixture of Ti(OCH(CH3)2)4 solution with Ni(NO3)2?6H2O powder, respectively. The effect of the ratio between Ni(NO3)2?6H2O powder and Ti(OCH(CH3)2)4 solution (0.5 atm%, 1 atm%, 2 atm%, and 4 atm% of Ni(NO3)2?6H2O) on the efficiency of DSSCs were studied. The surface morphology, crystal structure and optical properties of TiO2 and NiO/TiO2 composite films on FTO and glass substrates were characterized by using field-emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), and UV-VIS spectrophotometer, respectively. The FE – SEM images showed that the films were smooth surface and dense when prepared at 200 ℃. The XRD results of TiO2 and NiO/TiO2 composite films on the FTO substrates showed that the TiO2 crystals were anatase phase because the peak at 25.30 corresponds to (101) planes of anatase. The spectrophotometer results showed that the optical transmittance for all samples were about 80%. For the energy conversion efficiency characterization, it was found that the NiO/TiO2 composite films that were prepared from 0.5 atm% of Ni(NO3)2?6H2O solution had the better energy conversion efficiency than TiO2 films.
关键词： NiO/TiO2 composite film,Dye sensitized solar cell,Spray pyrolysis technique
更新于2025-09-23 15:21:01
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Synthesis of BiVO4/WO3 composite film for highly efficient visible light induced photoelectrocatalytic oxidation of norfloxacin
摘要： In this study, we synthesized BiVO4/WO3 composite film via a hydrothermal method and successive ionic layer adsorption and reaction (SILAR) for photoelectrocatalytic (PEC) degradation of norfloxacin (NOR) under visible light irradiation (λ > 420 nm). The BiVO4/WO3 composite film was characterized by various techniques in details. These results suggested that BiVO4 was successfully assembled onto the WO3 film surface. The BiVO4/WO3 composite film exhibited enhanced PEC performance and the apparent rate constant for degradation of NOR was estimated to be 2.68 × 10-3 min-1, which was 3.52 and 2.39 times higher than that of WO3 and BiVO4 film, respectively. The superior PEC performance could be ascribed to the formation of n-n junction facilitating the interfacial charge transfer and separation rate, resulting in the enhanced light-harvesting capability. The generated h+, ?O2- and ?OH radicals were responsible for the PEC degradation of NOR confirmed by the radicals trapping experiments and ESR spin-trap technique. Analysis of the degradation intermediates implied that the piperazine ring of the norfloxacin was mainly attacked during the visible-light-driven degradation process.
关键词： SILAR,photoelectrocatalytic oxidation,BiVO4/WO3 composite film,norfloxacin
更新于2025-09-19 17:15:36
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Modifying the nanostructures of PEDOT:PSS/Ti3C2TX composite hole transport layers for highly efficient polymer solar cells
摘要： Two-dimensional (2D) transition metal carbides MXene, typically represented by Ti3C2TX, have shown great promise in optoelectronic devices due to their metallic electrical conductivity, large surface area, superior hydrophilicity and excellent transparency. Herein, to improve the conductivity of polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) film, we incorporate solution-processable 2D Ti3C2Tx nanosheets into PEDOT:PSS to fabricate PEDOT:PSS/Ti3C2TX composite layers, and polymer solar cells (PSCs) with PEDOT:PSS/Ti3C2TX composite films as hole transport layers (HTLs) are fabricated for the first time. The nanostructures and the corresponding hole injection properties of PEDOT:PSS/Ti3C2TX composite layers are systematically evaluated. Based on the non-fullerene PBDB-T:ITIC system, a power conversion efficiency (PCE) of 11.02% is obtained for the device with PEDOT:PSS/Ti3C2TX as HTL, which is improved by 13.5% than that of the control device with pure PEDOT:PSS as HTL (9.72%). When using the PM6:Y6 system as the active layer, the PCE of the device based on PEDOT:PSS/Ti3C2TX is improved to 14.55% from 13.10% for the PEDOT:PSS reference device. 2D Ti3C2TX nanoflakes with higher conductivity constructing additional charge transfer pathways between the PEDOT nanocrystals and inducing conformational transition of PEDOT from a coil to a liner/expanded-coil structure, leading to the conductivity and device performance improvement. Interestingly, PEDOT:PSS/Ti3C2TX based devices also exhibit enhanced long-term stability than PEDOT:PSS based device. These results show that PEDOT:PSS/Ti3C2TX composite film has a promising prospect in high efficiency organic optoelectronics.
关键词： PEDOT:PSS/Ti3C2Tx composite film,hole injection property,improved conductivity,polymer solar cells,hole transport layer
更新于2025-09-19 17:13:59
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Performance of PVDF/TiO<SUB align="right">2 nano-composite film in the application of energy harvester
摘要： The compression mode and shear mode for energy harvesting experimental platform was estabished. The energy collection efficiency of PVDF/TiO2 nano-composite film in the two mode and nonlinear piezoelectric effect were analysed. Experimental results show that the energy collection efficiency of the shear mode was higher than the compressed mode. The Piezoelectric constant and piezoelectric coupling coefficient have nonlinear changes under large stress. In this paper, the experimental data establish a relationship electromechanical coupling coefficients and parameters of composite thin film piezoelectric stress.
关键词： nano-composite film,PVDF,TiO2,energy harvester
更新于2025-09-10 09:29:36