Strain-induced stabilization of Al functionalization in graphene oxide   nanosheet for enhanced NH3 storage
  Strain effects on the stabilization of Al ad-atom on graphene oxide(GO)nanosheet as well as its implications for NH3 storage have been investigated using first-principles calculations.The binding energy of Al ad-atom on GO is found to be a false indicator of its stability.Tensile strain is found to be very effective in stabilizing the Al ad-atom on GO.It strengthens the C-O bonds through an enhanced charge transfer from C to O atoms. Interestingly,C-O bond strength is found to be the correct index for Al's stability.Optimally strained Al-functionalized GO binds up to 6 NH3 molecules,while it binds no NH3 molecule in unstrained condition. 
Yunguo Li, Abir De Sarkar, Biswarup Pathak, Rajeev Ahuja
cond-mat.mtrl-sci physics.chem-ph physics.comp-ph