Sequential Growth and Etching of Gold Nanocrystals Revealed by High‐Resolution Liquid Electron Microscopy (Phys. Status Solidi A 7∕2019)

Abstract

Gold Nanocrystals Direct observation for growth and etching of colloidal nanocrystals will likely benefit rational design of specific nanoparticles. In this study, the graphene liquid cell electron microscopy not only provides the environment for growth and oxidative etching of colloidal gold nanocrystals, but also proves whole process from growth to etching. Direct observation demonstrates different kinetics at each step. More details can be found in article number http://doi.wiley.com/10.1002/pssa.201800949 by Sang Yun Kim, Jong Min Yuk, and co‐workers.

Air‐Processed Blue Perovskite Light‐Emitting Diodes Enabled by Manipulation of Adsorbed‐Moisture‐Dominated Crystallization Kinetics

“…[1][2][3][4] However, the fabrication of perovskite with designed emission wavelength and high PLQY still needs to proceed in a glovebox filled with inert gas to eliminate the interference of moisture, and this necessarily strict atmosphere protection has been denounced as an insurmountable obstacle to the commercialization progress of perovskite LEDs (PeLEDs). [5,6] Although the fabrication of air-processed perovskite is still a formidable challenge, [7] thanks to the unremitting efforts on the strategies of stability improvement, such as phase aggregation suppression, [8] encapsulation of hydrophobic aerogel nanoparticles, [9] nitrogen (N 2 ) gas blowing during spin coating, [10] and polymer doping, [11] a few preliminary successes of air-processed perovskite have been achieved in PeLEDs with green, [8][9][10] and near-infrared emission. [11,12] However, the air-processed blue PeLEDs have not been reported in state-of-the-art, so far, because the fabrication of blue PeLEDs meets more difficulties on control of emission wavelength and PLQY, which are even compounded in air conditions with the interference of moisture.…”