Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes. - Thanattha Chobsilp; Thotsaphon Threrujirapapong; Visittapong Yordsri; Alongkot Treetong; Saowaluk Inpaeng; Karaked Tedsree; Paola Ayala; Thomas Pichler; Lei Shi; Worawut Muangrat (Sensors, 2022)