Search

Solution-processed molybdenum disulfide (MoS2) nanosheets are facilely synthesized through liquid phase exfoliation and dispersed in isopropanol using a simple solvent exchange method. Raman spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy measurements show that the synthesized MoS2 nanosheets consist of typical two layers with superior film morphology and unique electronic properties such as partial oxidization and suitable surface work function. Effective anode buffer layers (ABLs) are obtained by spin-coating isopropanol-dispersed MoS2 nanosheets and accordingly efficient organic light-emitting diodes (OLEDs) are demonstrated. With tris(8-hydroxy-quinolinato)aluminium as emitter and 0.7 mg/mL MoS2 as ABL, the OLED shows a maximum luminous efficiency of 7.27 cd/A with an increment of 28.4% in comparison with the counterpart using favorite poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) as ABL. The current–voltage characteristics of hole-only devices confirm that solution-processed MoS2 nanosheets exhibit appropriate hole injection capacity, which favorably contributes to carrier balance and superb OLED performance. Our results open up an alternative route for accelerating MoS2 applications with solution process. [ABSTRACT FROM AUTHOR]

Formamidinium lead iodide (FAPbI3) is a promising candidate as the solar cell absorption layer with a suitable band gap of 1.45 eV and excellent optoelectronic properties. In this work, we report a new vacuum flash evaporation method to deposit phase-pure black α-FAPbI3 films in situ on low-temperature substrates without post-annealing, and the area of deposited films can be up to 36 cm2 (6 cm × 6 cm). Besides, the unique relationship between substrate temperature and phases in films is demonstrated for the further development of the method. With the α-FAPbI3 films as the active layer, perovskite solar cells with power conversion efficiency of 12.55% are fabricated. [ABSTRACT FROM AUTHOR]

This study focused on developing a self-nanoemulsifying drug delivery system (SNEDDS) containing bioactive surfactants under an efficient screening approach for overcoming problems associated with the delivery of norcantharidin (NCTD), a high dose chemotherapy agent having pH dependent solubility. Preliminary screening was implemented to select proper components combination. Besides the solubility of NCTD in the oil phase, emulsifying efficiency, droplet size and size distribution were also employed to select components of the SNEDDS. Moreover, the influence of surfactant and co-surfactant on the interfacial tension and droplets of nanoemulsions were investigated to further understand the mechanism of spontaneous emulsification. Co-surfactant addition promoted the emulsification via reducing the water/oil interfacial tension and viscosity. Ternary phase diagrams were constructed to investigate the phase behavior and designate the optimum systems. The alternative formulations were characterized for cloud point, dilution robustness, droplet size, polydispersity index (PDI) and transmission electron microscopy (TEM).In vitrodissolution study showed that the dissolution rate of optimized formulation (NCTD 10 mg/g, EO 50 wt.%, Cremophor EL 35 wt.%, ethylene glycol 15 wt.%) was slower than drug suspension under the same conditions, confirming that the developed SNEDDS formulation would exhibit sustained release potential. [ABSTRACT FROM PUBLISHER]