Rhodium as efficient additive for boosting acetone sensing by TiO2 nanocrystals. Beyond the classical view of noble metal additives - Epifani, Mauro (Istituto per la Microelettronica e i Microsistemi) ; Kaciulis, Saulius (Istituto per lo Studio dei Materiali Nanostrutturati) ; Mezzi, Alessio (Istituto per lo Studio dei Materiali Nanostrutturati) ; Zhang, Ting (Institut Català de Nanociència i Nanotecnologia) ; Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia) ; Siciliano, Pietro (Istituto per la Microelettronica e i Microsistemi) ; Landström, Anton (Luleå University of Technology. Department of Engineering Science and Mathematics) ; Concina, Isabella (Luleå University of Technology. Department of Engineering Science and Mathematics) ; Moumen, Abderrahim (Brescia University. Department of Information Engineering) ; Comini, Elisabetta (Brescia University. Department of Information Engineering) ; Xiangfeng, Chu (Anhui University of Technology. School of Chemistry and Chemical Engineering)