Writing metasurfaces by hand: a pen-based MXene approach for flexible and low-waste paper platforms - Carvalho, William Orivaldo Faria; Facure, Murilo Henrique Moreira; Mendes, Luciano Leonel; Oliveira Junior, Osvaldo Novais de; Corrêa, Daniel Souza; Mejía-Salazar, Jorge Ricardo (Journal of Applied Physics, 2026)