Peng Zhantao, Di Bin, Li Wentao, Liu Dan, Wen Xiaojie, Zhu Hao, Song Huanjun, Zhang Yajie, Yin Cen, Zhou Xiong, Wu Kai
BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
Angew Chem Int Ed Engl. 2020 Aug 17;59(34):14321-14325. doi: 10.1002/anie.202005370. Epub 2020 Jul 2.
Potassium (K) cations are spontaneously formed upon thermal deposition of low-coverage K onto an ultrathin CuO monolayer grown on Cu(110) and they were explored by low-temperature scanning tunneling microscopy (STM) and X-ray photoemission spectroscopy. The formed K cations are highly immobile and thermally stable. The local work function around an individual K cation decreases by 1.5±0.3 eV, and a charging zone underneath it is established within about 1.0 nm. The cationic and neutral states of the K atom are switchable upon application of an STM bias voltage pulse, which is simultaneously accompanied by an adsorption site relocation.
在低温下将低覆盖度的钾热沉积到生长在铜（110）上的超薄氧化铜单层上时，钾（K）阳离子会自发形成，并用低温扫描隧道显微镜（STM）和X射线光电子能谱对其进行了研究。形成的钾阳离子具有高度的迁移惰性和热稳定性。单个钾阳离子周围的局部功函数降低了1.5±0.3电子伏特，并且在其下方约1.0纳米范围内形成了一个充电区。施加STM偏置电压脉冲时，钾原子的阳离子态和中性态可相互转换，同时伴随着吸附位点的重新定位。
