Direct polymerization of polyheptazine in the interlamelar spaces of titanate nanotubes enhances visible-light response Barbara S. Rodrigues, VinÃcius A. Almeida, Caroline H. Claudino, Carlos Ponce-de-Leon, Dmitry V. Bavykin, Juliana S. Souza*, 10.1007/s40097-020-00357-7 XML