Exploring the electronic properties of N-doped graphene on graphitic and pyridinic models and its interaction with K+ ions using the DFTB method. - Hidayat, Yuniawan; Rahmawati, Fitria; Nugrahaningtyas, Khoirina Dwi; Althof Abiyyi, Abdurro'Uf; Erlangga, Mohamad Zola; Pujiastuti, Nourma (Australian Journal of Chemistry, 2022)