- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Fabrication and performance of dye sensitized solar cell based on spin coated ZnS nanoparticles
摘要： ZnSx nanoparticles (NPs) with different ratios of sulfur, x = 0.5, 1 and 2, were prepared by solvothermal technique. The structural analyses, based on XRD and FTIR, show that for sulfur content x = 0.5 two phases were formed ZnS and ZnO NPs with cubic and hexagonal structure, respectively. While for sulfur content x = 1 and 2 only ZnS NPs with cubic structure was observed. The crystallites size was study before and after annealing at 500 °C. SEM images show that the prepared samples have nanocrystalline nature. Absorbance spectrum was used to calculate the optical band gap of the powder samples dispersed in potassium hydroxide solution. All samples have direct optical band gap which was inversely proportional to the sulfur content. ZnS NPs were irradiated by different doses of γ-rays and the effect on optical band gap was studied. The resulting from solvothermal preparation technique was served as precursor solution to deposit ZnSx layers onto the fluorine-doped tin oxide coated glass substrates by spinning process. The deposited ZnS NPs layers were successfully used as photoelectrode materials in dye-sensitized solar cells and the I–V characteristics were measured under illumination and in dark. An improvement in the efficiency was observed after annealing the ZnSx layers, x = 0.5 and 1, photoelectrode materials.
关键词： Dye-sensitized solar cells,Solvothermal technique,ZnS nanoparticles,γ-irradiation,Optical band gap
更新于2025-09-12 10:27:22
-
AIP Conference Proceedings [AIP Publishing ADVANCES IN BASIC SCIENCE (ICABS 2019) - Bahal, India (7–9 February 2019)] ADVANCES IN BASIC SCIENCE (ICABS 2019) - Photoluminescence and chromaticity properties of CdSe nanobeads made by a complexing agent assisted hydrothermal method for LEDs and laser applications
摘要： CdSe nanosbeads have been synthesized using a complexing agent assisted hydrothermal method. It is found that the presence of complexing agent (Oleic acid) plays a key role in the formation of nanobeads. The structural, morphological and optical properties of CdSe nanoparticles have been investigated. The obtained nanobeads of cadmium selenide are of wurtzite structure. It is inferred that the nucleation and agglomeration of nuclei is a major reason of the formation of nanobeads. The optical results show the obtained band gap is blue shifted from the bulk value and the photoluminescence and chromaticity spectrum show that the prepared CdSe nanobeads are yellowish green color emitters and useful for yellowish green LEDs and lasers.
关键词： chromaticity,nanobeads,CdSe,LEDs,luminescence,solvothermal route
更新于2025-09-11 14:15:04
-
Efficiency Improvement of TiO <sub/>2</sub> Nanorods Electron Transport Layer Based Perovskite Solar Cells by Solvothermal Etching
摘要： The efficiency improvement of perovskite solar cells (PSCs) by solvothermal etching and/or TiCl4 treatment of TiO2 nanorod arrays (NRAs) based electron transport layer (ETL) is reported in this article. The TiO2 NRAs are explore for the ETL because of their better direct carrier transportation over other TiO2 nanostructures. The solvothermal etching of TiO2 NRAs enhances the surface-to-volume ratio of the ETL, which, in turn, enhances the power conversion efficiency (PCE) of the PSCs. All the measurements are performed at room temperature and high humid (with ～65% humidity) conditions to demonstrate the performance of the PSCs under normal environmental conditions. A noteworthy efficiency of 15.16% with an improved fill factor and short circuit current density (JSC) is achieved in the proposed PSCs under this article. The performance of the PSC is shown to improve further by exploring TiCl4 treatment of the solvothermally etched TiO2 NRs as the ETL in the device.
关键词： solar cell,solvothermal etching,TiO2 nanorods,perovskite,Hydrothermal process
更新于2025-09-11 14:15:04
-
Nanoparticles-assembled ZnFe2O4 mesoporous nanorods for physicochemical and magnetic properties
摘要： Hierarchically one dimensional (1-D) mesoporous ZnFe2O4 rods with nanoparticles as their building blocks have been synthesized by the solvothermal approach. The influence of annealing temperature on structural, morphological, optical and magnetic properties was intensively investigated. X-ray diffraction was used to ascertain the phase purity of synthesized samples. To perceive the information on morphological and structural features, field emission scanning electron microscopy and high resolution transmission electron microscopy with energy dispersive spectroscopy was probed. It was observed that nanorods with high aspect ratio were obtained when treated at 600 °C (ZF600) annealing temperature as compared to 400 °C (ZF400). Fourier transform infra-red spectroscopy was resorted to gain the insight of bonding mechanism associated with ZF400 and ZF600. To enrich the study on material chemistry and defects, Raman spectroscopy and X-ray photoelectron spectroscopy was performed. Brunauer–Emmett–Teller envisioned the surface area of ZF400 and ZF600. It was found that surface area decreases with increase in annealing temperature. UV–Vis spectroscopy expounds that the optical band gap increases with annealing temperature from 3.0 to 3.3 eV for ZF400 to ZF600 respectively. Magnetic measurements were performed on vibrating sample magnetometer at room temperature and the results decipher the superparamagnetic nature of the synthesized material. Additionally, saturation magnetization was found to increase with annealing temperature.
关键词： optical properties,nanorods,ZnFe2O4,solvothermal,magnetic properties,annealing
更新于2025-09-11 14:15:04
-
Solvothermal Synthesis, Crystal Structure and Luminescent Property of Metal-Organic Frameworks with New Topology Built from Tetrazole Ligand
摘要： A novel two-dimensional (2D) Zn(II) metal-organic frameworks [Zn2(H2bdc)(ATZ)2.5(H2O)·2(H2O)] (1; H2bdc = 1,4-benzenedicarboxylate; ATZ = 5-aminotetrazole) has been solvothermally prepared and structurally characterized by single-crystal X-ray diffraction, which shows that compound 1 crystallized in the orthorhombic space group Pbcm with a = 10.2647(3) ?, b = 26.1194(12) ?, c = 27.3699(13) ?, α = β = γ = 90°, V = 7338.1(5) ?3 and Z = 4. Compound 1 exhibits a layered structure with 3,4-connected new topology, and further stacking of layers leads to a 3D supramolecular framework. The thermalgravimatric behaviour and luminescent properties of 1 have been also investigated. The compound exhibits an intense photoluminescence emissions at 450 nm (λex = 375 nm).
关键词： Tetrazole,Luminescent,Metal-organic frameworks,Crystal structure,Solvothermal
更新于2025-09-11 14:15:04
-
Silver Nanorings: New generation of Transparent Conductive Films
摘要： Low-cost and high yield silver nanorings with the uniform ring diameter of 15±5 μm and thickness of 120±20 nm were synthesized via a simple solvothermal method. As we know, it is the first time that solvothermal method is used to prepare silver nanorings. Herein, by using ammonium salts as additive salts in the presence of pressure inside the reactor, the repeatability and yield of nanorings extremely increased. The prepared silver nanorings easily dispersed in ethanol and coated by spray method on PET substrate to make flexible transparent conductive films (TCF). The film based on nanorings was shown better opto-electrical properties (higher transparency with lower haze) in comparison with nanowires with higher aspect ratio and lower thickness, at the same sheet resistance (Rs). These results introduce silver nanorings as an outstanding candidate for optoelectronics applications.
关键词： Metal Nanoring,Transparent conductive film,Tetrapropylammonium salts,Solvothermal method,Spray coating
更新于2025-09-10 09:29:36
-
Facile Synthesis of Carbon Nanotubes Covalently Modified with ZnO Nanorods for Enhanced Photodecomposition of Dyes
摘要： Utilizing a one-pot solvothermal procedure novel one-dimensional zinc oxide-carbon nanotube nanohybrids (ZnCT) were synthesized in alcohol-alkali solution, free of catalytic assistance. The ZnCT hybrids were prepared through covalent modification of zinc oxide nanorods (ZnO NRs) with functionalized carbon nanotubes (f-CNTs). The morphology and microstructure of as-prepared ZnCT hybrids were characterized by scanning electron microscopy (SEM), powder X-ray diffraction, Raman, X-ray photoelectron and UV-vis absorption spectroscopies. SEM images of the ZnCT hybrids indicated that the ZnOethanol NRs grew longer along the vertical radial (0001) surface and aggregated to a lesser extent than the analogous ZnOmethanol NRs. Photodegradation analysis showed that the off-white ZnCTethanol hybrid with ascendant UV-visible light absorption had displayed superior photocatalytic activity towards Rhodamine B (RhB) dyes than either pure ZnOethanol, ZnOmethanol NRs or ZnCTmethanol hybrid, among which the photocatalytic activity of ZnOethanol NRs was better than that of ZnOmethanol NRs. Raman and X-ray photoelectron spectroscopy analyses confirmed a strong interaction between f-CNTs and ZnOethanol NRs in ZnCTethanol hybrid, in which Zn ions were chemically bonded to negatively charged oxygen-containing groups at the graphene-like surface of f-CNTs. The enhanced separation lifetime of the photogenerated electron-hole observed by surface photovoltage and photocurrent measurements of the ZnCTethanol hybrid was attributed to the efficient covalent linking of Zn-O-C and close contact configuration between the f-CNTs and ZnOethanol NRs. Further controlled photodegradation and electron spin resonance (ESR) analyses revealed that the photodegradation of RhB dyes resulted from photogenerated holes, and radical species, such as ?O2?、?OH?, which were formed in-situ. Details of the photocatalytic mechanism were also explored herein.
关键词： Solvothermal synthesis,ZnO nanorods,Carbon nanotubes,Dyes,Photodegradation
更新于2025-09-10 09:29:36
-
Dry-co-grinding of doped TiO2 with nitrogen, silicon or selenium for enhanced photocatalytic activity under UV/visible and visible light irradiation for environmental applications
摘要： TiO2 doped with nitrogen (N), silicon (Si), or selenium (Se) (N-TiO2, Si-TiO2, and Se-TiO2) were obtained by the integrated sol-gel and solvothermal method with short time of crystallization and low temperature. The UV/visible and visible light absorption and photocatalytic activity of these doped TiO2 materials were improved by a dry-co-grinding process with a short grinding time and low rotational speed (30 min at 200 rpm) to obtain N-TiO2/Si-TiO2 and N-TiO2/Se-TiO2 catalysts. The materials were characterized by XRD, Raman, BET surface area and porosity, XRF, SEM, TEM, FTIR-ATR, and UV/vis-DRS analyses. The photocatalytic activity of these materials was evaluated by the degradation of phenol under UV/visible and visible light irradiation. The integrated sol-gel and solvothermal methods with short time of crystallization (2 h) and low temperature (225 °C), and the dry-co-grinding process during 30 min at 200 rpm led to materials (N-TiO2/Si-TiO2 and N-TiO2/Se-TiO2) with higher specific surface area, a reduction in the band gap value, and an enhancement of the absorption in the visible light spectrum. Moreover, N-TiO2/Si-TiO2 and N-TiO2/Se-TiO2 exhibited higher photocatalytic activities for degradation of phenol under UV/visible and visible light irradiation than those obtained with the doped TiO2, synthesized TiO2 or TiO2 P25.
关键词： Doping TiO2,Titanium dioxide,Sol-gel,Co-grinding process,Solvothermal
更新于2025-09-10 09:29:36
-
Preparation of Ni(OH)2/TiO2 porous film with novel structure and electrochromic property
摘要： Ni(OH)2/TiO2 nanorod composite porous film with a novel structure and remarkable electrochromic (EC) behavior was prepared on a fluorine doped tin oxide (F:SnO2; FTO) coated glass substrate by hydrothermal and solvothermal techniques. A pure Ni(OH)2 porous film was also prepared on another FTO substrate by the solvothermal technique for comparison. The growth process of Ni(OH)2 on the surface of TiO2 nanorod layer was investigated carefully. The component, morphology and microstructure of the films, as well as their EC performances including transmittance, cyclic voltammetry (CV), cycle life and response time were characterized. Compared with those of the pure Ni(OH)2 film, the EC performances of Ni(OH)2/TiO2 composite film have exhibited obvious enhancement owing to the good interface bonding, Ni(OH)2 porous structure, TiO2 nanorod layer and interpenetrating structure. Furthermore, it is noteworthy that the transmittance contrast in near infrared light area was distinctly improved, and even exceeded 95% after the 100th cycle, promising the Ni(OH)2/TiO2 nanorod composite porous film a potential EC application in near infrared light area in the future.
关键词： Composite porous film,Electrochromic property,Ni(OH)2/TiO2 nanorods,Solvothermal,Preparation
更新于2025-09-10 09:29:36
-
CaF<sub>2</sub> Nanocrystals Synthesis That Have a Unique Shape
摘要： CaF2 nanocrystals with a clear cubic shape were synthesized using both simple mixing and a hydrothermal method that neither of which required the use of surfactants or dispersants. The concentration and pH of the reaction medium, which in this case was an aqueous HNO3 solution, was found to be very important for determining the morphology of the CaF2 particles.
关键词： nanocrystal,solvothermal reaction,CaF2,morphology control
更新于2025-09-10 09:29:36