Band gap engineering and layer-by-layer mapping of selenium-doped molybdenum disulfide

Yongji Gong, Zheng Liu, Andrew R. Lupini, Gang Shi, Junhao Lin, Sina Najmaei, Zhong Lin, Ana Laura Elías, Ayse Berkdemir, Ge You, Humberto Terrones, Mauricio Terrones, Robert Vajtai, Sokrates T. Pantelides, Stephen J. Pennycook, Jun Lou, Wu Zhou, Pulickel M. Ajayan^*