COVID-19 impedimetric biosensor based on polypyrrole nanotubes, nickel hydroxide and VHH antibody fragment: specific, sensitive, and rapid viral detection in saliva samples. - Santos A; Macedo de Souza Brandão AP; Hryniewicz BM; Abreu H; Bach-Toledo L; Schuster da Silva S; Deller AE; Rogerio VZ; Baêta Rodrigues DS; Hiraiwa PM; Guimarães BG; Marchesi LF; et al. (Materials today. Chemistry, 2023)