- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Biomimetic Polyimide-Supported Cuprous Oxide Photocatalytic Film with Tunable Hydrophobicity, Improved Thermal Stability, and Photocatalytic Activity toward CO <sub/>2</sub> Reduction
摘要： Flexible and thermally stable polyimide (PI) ?lms containing a hierarchical surface structure were synthesized as substrates to support visible-light active cuprous oxide for photocatalytic reduction of carbon dioxide for the ?rst time. With the nanocasting technique, the surface structure on the leaves of Xanthosoma sagittifolium was successfully duplicated on PI ?lms. Followed by the ion-exchange process and adequate thermal treatment, cuprous oxide nanoparticles were successfully immobilized on the arti?cial PI leaves and exhibited the capability to photoreduce carbon dioxide into carbon monoxide under visible-light illumination. With the selection of biomimetic structures and adjustment of fabrication parameters, the hydrophobicity and optical absorption edge of the photocatalytic ?lm were tunable. An increase in hydrophobicity improved the yield of carbon monoxide. The introduction of a hierarchical structure on the surface and cuprous oxide within the matrix dramatically enhanced the thermal stability of the PI ?lm. The ?exible photocatalytic ?lm is a promising material for the applications requiring high mechanical and thermal stability, such as industrial ?ue-gas treatments.
关键词： Thermal Stability,CO2 Reduction,Hydrophobicity,Polyimide,Photocatalytic,Biomimetic,Cuprous Oxide
更新于2025-09-23 15:22:29
-
Fabry–Perot Cavity Sensing Probe with High Thermal Stability for an Acoustic Sensor by Structure Compensation
摘要： Fiber Fabry–Perot cavity sensing probes with high thermal stability for dynamic signal detection which are based on a new method of structure compensation by a proposed thermal expansion model, are presented here. The model reveals that the change of static cavity length with temperature only depends on the thermal expansion coefficient of the materials and the structure parameters. So, fiber Fabry–Perot cavity sensing probes with inherent temperature insensitivity can be obtained by structure compensation. To verify the method, detailed experiments were carried out. The experimental results reveal that the static cavity length of the fiber Fabry–Perot cavity sensing probe with structure compensation hardly changes in the temperature range of ?20 to 60 °C and that the method is highly reproducible. Such a method provides a simple approach that allows the as-fabricated fiber Fabry–Perot cavity acoustic sensor to be used for practical applications, exhibiting the great advantages of its simple architecture and high reliability.
关键词： high thermal stability,thermal expansion model,structure compensation,Fabry–Perot cavity,acoustic sensor
更新于2025-09-23 15:21:21
-
Thermal stability investigation of the SS/MO/Al <sub/>2</sub> O <sub/>3</sub> spectrally selective solar absorber coatings
摘要： A novel Mo/Al2O3 spectrally selective solar absorber coating is deposited onto stainless steel (SS) substrates using magnetron sputtering method, which exhibits a high absorptance (α) of 0.90 and a low emittance (ε) of 0.08. In order to investigate the thermal stability, the SS/Mo/Al2O3 coatings are annealed in air and vacuum at di?erent temperatures. The surface morphology, microstructure, composition distribution, di?usion and optical properties before and after high-temperature annealing are characterised by scanning electronic microscopy (SEM), atom force microscopy (AFM), X-ray di?raction (XRD), micro-Raman spectroscopy, UV–vis spectrophotometer and emissometer. Experimental results indicate that the coatings are stable in air at 350°C. The values of solar absorptance and emittance below 350°C are 0.87–0.90 and 0.06–0.08, respectively. The coatings remain stable after annealed at 600°C in vacuum for 2 h with a good spectral selectivity (α/ε) of 0.89/0.06.
关键词： microstructure,Spectrally selective coating,annealing,thermal stability
更新于2025-09-23 15:21:21
-
A Review: Crystal Growth for High-Performance All-inorganic Perovskite Solar Cells
摘要： Recently, halide perovskites have become one of the most promising materials for solar cells owing to their outstanding photoelectric performance. Among them, metal halide all-inorganic perovskites (CsPbX3; where X denotes a halogen) show superior thermal and light stability. In particular, the power conversion efficiency (PCE) of perovskite solar cells (pero-SCs) based on a CsPbX3 active layer has shown a steady increase from 2.7% to 19.03% with the improvement of the CsPbX3 crystal quality. In this review, we summarize methodologies that have been employed for controlling the growth of all-inorganic perovskite films so far, including precursor solution deposition, substrate modification, composition doping, and surface engineering. Furthermore, we discuss the effect of perovskite crystal characteristics on defects and perovskite film morphology, both of which are closely related to device performance. Finally, conclusions and perspectives are presented along with useful guidelines for developing all-inorganic pero-SCs with high PCE and robust stability.
关键词： light stability,halide perovskites,precursor solution deposition,all-inorganic perovskites,surface engineering,substrate modification,thermal stability,power conversion efficiency,CsPbX3,composition doping,solar cells,crystal growth
更新于2025-09-23 15:21:01
-
Thermally Stable, Efficient, Vapor Deposited Inorganic Perovskite Solar Cells
摘要： We report on thermally stable inorganic mixed halide perovskite solar cells deposited using a vapor deposition technique with no loss in device performance at 200 °C for 72 hours. X-ray diffraction analysis confirms no compositional degradation of the perovskite layer up to 200 °C anneals. We use a layer-by-layer vapor deposition technique with thin layers (several nm) of PbI2 and CsBr precursors to fabricate inorganic mixed halide perovskite solar cells with a photoconversion efficiency of 11.8%. We study the effect of several key parameters of the perovskite fabrication process that control the intermixing of the perovskite layer and their effect on device efficiency and hysteresis. The thermal stability of the perovskite material and its energy band gap of 1.87eV makes it appropriate for use in tandem junction cells for use in real-life environments with high solar illuminance where the ambient temperatures exceed 55 °C in the summer, and silicon cell module temperatures approach 86 °C.
关键词： Thermal Stability,inorganic perovskite solar cells,vacuum deposition,mixed halide perovskites,layer-by-layer deposition,thermal degradation
更新于2025-09-23 15:21:01
-
[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Determination of Crystallinity and Thermal Stability of Newly Developed Thermoplastic Polyolefin Encapsulant for the c-Si PV Module Application
摘要： Thermoplastic polyolefin (TPO) is a newly developed non-crosslinking encapsulant for the crystalline silicon PV modules lamination. The degree of crystallinity and thermal stability of TPO have been studied and compared with the most commonly used ethylene vinyl acetate (EVA) copolymer encapsulant. The peak melting point and the degree of crystallinity have been determined with the help of differential scanning calorimeter (DSC) analysis. The crystallinity of both the encapsulant also studied with x-ray diffraction. DSC results show that there is no crosslinking reaction involved in the TPO encapsulant. Thermogravimetric analysis (TGA) is done to determine the thermal stability and thermal decomposition onset temperature. This work will help in understanding the thermal behavior and degree of crystallinity of newly developed TPO encapsulant, which can also potentially replace the EVA encapsulant for the PV module application.
关键词： encapsulant,polyolefin,crystallinity,thermal stability,ethylene vinyl acetate,photovoltaics
更新于2025-09-23 15:21:01
-
Amine-passivated ZnO electron transport layer for thermal stability-enhanced perovskite solar cells
摘要： n-Type zinc oxide (ZnO) has high electron mobility, good light transmittance, and a suitable work function and is considered to be a suitable electron transport material in perovskite solar cells (PSCs). However, the chemical compatibility between ZnO and perovskites is poor, making it di?cult to prepare highly e?cient and stable PSCs by a one-step spin coating method. Here, the ZnO surface is modi?ed with three amino compounds, butylamine (BA), isobutylamine (IBA) and 2-amino-2-methyl-1-propanol (AMP). Three amino compounds can react with 3D perovskite to form a thin and more stable perovskite with a 2D structure, which can improve the stability of ZnO-based PSCs fabricated by one-step method. Interestingly, the conductivity of amine-modi?ed ZnO is also improved due to the presence of amino (NH2) and hydroxyl (OH) groups which can induce the dipole polarization. The modi?cation of amino compounds on the surface of ZnO can a?ect the hydrophilicity of ZnO surface that is related to the crystallization of perovskite ?lm. Devices with IBA modi?cation exhibit improved stability, and the power conversion e?ciency (PCE) can reach 18.84%. Therefore, we provide a new strategy to improve the surface of the ZnO electron transport layer for high-performance PSCs fabricated by a one-step method.
关键词： ZnO,Perovskite solar cells,Interface modi?cation,Thermal stability
更新于2025-09-23 15:21:01
-
Dual-mode light-emitting lanthanide metal-organic frameworks with high water and thermal stability and its application in white LEDs
摘要： It is well known that the up-conversion luminescence from lanthanide metal-organic frameworks (Ln-MOFs) is difficult to achieve, and thus, there are few reports on dual luminescence-based MOFs. Here, dual-mode light-emitting Ln-MOFs are synthesized using a low-cost hydrothermal method. Our results show that the obtained Ln-MOFs not only have high thermal stability (up to 420 degrees) but also are stable in deionized water. The dual-mode up and down-conversion luminescence is simultaneously observed from Er-Eu-MOFs. The temperature-dependent fluorescence decay time is calculated to be ranged from 0.46 ms to 0.36 ms for temperatures from100 K to 300 K. We suggested that this phenomenon was because the number of phonons participating in the MOF matrix increases with temperature during the luminescence process, and the phonons interact with the electrons in the material. The values of the J-O parameters calculated from the emission spectra indicated that the symmetry around Eu3+ ions in Eu-MOF is the highest, which was also higher than that of Er-Eu-MOF. To explore the potential applications of Eu-MOFs in white light-emitting diodes (LEDs), red emission from Eu-MOFs was combined with blue, green, and yellow emissions from metal halide perovskites to achieve white light emission. The white light with excellent color quality and vision performance was obtained. These findings demonstrate that the Ln-MOFs are potentially successful materials for the applications in white LEDs.
关键词： high thermal stability,Dual-mode luminescence,LEDs,MOFs,lanthanide
更新于2025-09-23 15:21:01
-
A K3ScSi2O7: Eu2+ based phosphor with broad-band NIR emission and robust thermal stability for NIR pc-LEDs
摘要： In this work, an Eu2+-doped K3ScSi2O7 (KSSO) NIR phosphor with broad-band NIR emission and robust thermal stability was designed and synthesized successfully. The crystal structure, luminescent properties, the mechanism of abnormal NIR emission, thermal stability and application to NIR pc-LEDs were investigated in detail.
关键词： NIR phosphor,Eu2+-doped,K3ScSi2O7,thermal stability,NIR pc-LEDs,broad-band emission
更新于2025-09-23 15:21:01
-
Investigation of temperature stability of ITO films characteristics
摘要： The paper represents research of thermal stability of optical and electro-physical parameters of ITO films deposited using various techniques. Variation of optical and electro-physical parameters was recorded using spectroscopy, and Hall’s and four-probe measurements. The best thermal stability was demonstrated by ITO films deposited by metal target sputtering In(90%)/Sn(10%) in mixture of gases O2 (25%) + Ar (75%) with further annealing in air atmosphere. This enables to apply this technique for production of thin film transparent resistive elements capable to heat the translucent structures up to 100?С without deterioration of their parameters.
关键词： thermal stability,transparent heating elements,magnetron sputtering,ITO films
更新于2025-09-23 15:21:01