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Effect of ethanolamine passivation for ZnO nanoparticles in quantum dot light emitting diode structure
摘要： Aging effect of ZnO nanoparticles in quantum dot light-emitting diode (QD-LED) structure is studied. Coarsening of as-synthesized ZnO nanoparticles is observed in both solution and thin film structure, which potentially deteriorates device performance of QD-LED over time. Firstly, temperature effect on ZnO coarsening is investigated, and it reveals that ripening of ZnO nanoparticles is faster at higher temperature due to its diffusion controlled mechanism of nanoparticle coarsening. To observe aggregation of the ZnO in the film state, electron transporting part (ZnO/Al) of QD-LED structure was prepared. Current densities of the ZnO film and electron only device (QD/ZnO between two electrodes) are also measured. Resistance of the film increased as a function of aging time, which corresponds to optical microscopy observation of ZnO film. Aggregation of ZnO nanoparticles was directly measured by root-mean-square value in atomic force microscopy. Ethanolamine (EA) stabilizer is added in the ZnO solution to disperse the ZnO nanoparticles without aggregation. The effect of EA on the surface passivation of the ZnO was revealed by scanning electron micriscopy observation directly by suppressed pinhole formation. Finally, device lifetime was measured for QD-LED with EA stabilized ZnO to understand the effect of ZnO aging on long term QD-LED device operation.
关键词： ethanolamine,coarsening,ZnO,aging
更新于2025-11-21 11:03:13
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Colorimetric detection and typing of E. coli lipopolysaccharides based on a?dual aptamer-functionalized gold nanoparticle probe
摘要： A rapid method for identification and typing of lipopolysaccharides (LPS) was developed by utilizing the different binding affinities between two kinds of gold nanoparticles (AuNPs) functionalized with two aptamers. Aptamers against ethanolamine and E. coli O111:B4 LPS were used to functionalize the AuNPs. The AuNPs functionalized with ethanolamine aptamer can bind to ethanolamine and are termed general probe (G-probe). The G-probe can recognize any type of LPS because ethanolamine is a component of every type of LPS. This causes a sandwich-mediated aggregation of the AuNPs and a color change from red to blue. The AuNPs functionalized with aptamer against the LPS of E. coli O111:B4 specifically bind to O111:B4 LPS and are termed specific probe (S-probe). By using these two probes, a logic typing method was developed. It can detect LPS in concentrations between 2.5 and 20 μg·mL?1 and with a 1 μg·mL?1 detection limit. In the authors’ perception, the use of a dual aptamer-based colorimetric method has a large potential in terms of selective detection of microorganisms.
关键词： Logic typing,O55:B5,Aptasensor,O111:B4,Visible,Ethanolamine
更新于2025-09-23 15:22:29
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A facile strategy for enhanced performance of inverted organic solar cells based on low-temperature solution-processed SnO2 electron transport layer
摘要： High-efficiency organic solar cells (OSCs) based on low-temperature (LT) processed SnO2 electron transport layer (ETL) are promising for their commercial use. However, high density of traps and large contact barrier for carriers at the interface between LT SnO2 and the active layer has been reported. To solve the problem, various interface modifying layer materials, such as PFN, has been introduced. Currently, the fabrication process of such interface modifying layer materials is complex and expensive. Herein, a facile strategy involved a polar solvent ethanolamine (EA) is introduced to modify LT SnO2 surface. By soaking the SnO2 film into EA solution in 2-Methoxyethanol (2-ME), EA can easily anchor into SnO2 film surface and forms a continuous monomolecular layer via dehydration reaction. The whole process is green and highly compatible with a roll-to-roll process. Further study suggests that the deep trap centers on SnO2 surface are substantially reduced and the built-in potential in OSCs is reinforced. Finally, OSCs based on EA-modified SnO2 demonstrated an enhanced power conversion efficiency from 10.71% to 12.45% which was comparable to those based on ZnO (12.26%) under the same experiment parameters. Our work boosts the development of the inverted OSCs with easy fabrication and compatibility with roll-to-roll process.
关键词： SnO2,Ethanolamine,organic solar cells,Electron transport layer
更新于2025-09-16 10:30:52