Polyhedral Cu2O crystal: Morphology evolution from meshed nanocube to solid and gas-sensing performance

摘要: Abstract Previously, the formation of polyhedral Cu2O crystal is usually proposed like that seed crystals grow outward following relative growth rates (R values) along different directions (Inside-out Pattern) or surrounding building blocks aggregate toward center followed by ripening (Outside-in Pattern). However, in this study, simply mixing aqueous Cu(CH3COO)2, NaOH, and D-(+)-glucose order listed at 70 °C for a period, distinct manner polyhedron was observed based on carefully recording solution color changes elaborate time-dependent SEM/TEM observations, which referred to All-direction Pattern. More specifically, initially formed nanoshuttles first self-aggregated into porous braided structure with well-defined cubic framework then condensed solid cube from all direction via consuming fragments everywhere possible, rather than gradient densification inside-out outside-in. After that, fell common Outside-in Pattern, i.e., adsorbing surroundings ripening. Although many complex submicrostructures have been already reported, our best knowledge, grows such barely observed. It believed interesting mechanism could be general. What's more, 30 min-Cu2O powder made gas sensor towards ethanol, performance has reached level application.