文摘
On page 8271, Z. Wei, W. Hu, L.-W. Wang, J. Li and co-workers describe 2D β-Cu2S nanosheets with movable Cu and fixed S atoms that exist at around room temperature, where the Cu atoms can be fixed to form γ-Cu2S at lower temperatures. In the back cover image, a series of temperatures are represented by fire and ice. The background exhibits the potential applications of phase transitions in 2D Cu2S, such as information storage and nanoelectronics.