Gas Sensing of NiO‐SCCNT Core–Shell Heterostructures: Optimization by Radial Modulation of the Hole‐Accumulation Layer. - Raza, Muhammad Hamid; Movlaee, Kaveh; Leonardi, Salvatore Gianluca; Barsan, Nicolae; Neri, Giovanni; Pinna, Nicola (Advanced Functional Materials, 2020)