Three-dimensional hierarchical flower-like Mg-Al-layered double hydroxides: Fabrication, characterization and enhanced sensing properties to NOx at room temperature

Three-dimensional (3D) hierarchical flower-like Mg-Al-layered double hydroxides (MA-LDHs) with Mg: Al mole ratio of 100: 40, 100: 50, 100: 60 were fabricated by a simple hydrothermal method using the sodium dodecyl sulfate (SDS) as the template and intercalation layer. The hierarchical porous nanostructures provided natural channels for effective and fast transporting carriers. The MA-LDHs with Mg: Al mole ratio of 100: 50 (Mg-Al-LDHs-5) exhibited fast response and recovery time of 1.3 s and 30 s to 100 ppm NOx at room temperature (RT). The enhanced response of Mg-Al-LDHs-5 could be attributed to the unique hierarchical porous structure and gallery pathway. The formation mechanism of the 3D flower-like MA-LDHs was proposed. (C) 2015 Elsevier B.V. All rights reserved.