Preparation of porous flower-like CuO/ZnO nanostructures and analysis of their gas-sensing property

Three-dimensional ordered ZnO–CuO inverse opals toward low concentration acetone detection for exhaled breath sensing

“…The above results suggest that the S3 IO gas sensor is very beneficial for the practical exhaled breath measurement [20,[34][35][36].…”

“…Among these materials, the ZnO-CuO nanocomposites have attracted much interest as a promising sensing material, which can detect low concentration of the target gas [18][19][20][21][22]. For example, Kim et al prepared CuO/ZnO nanorods by photochemical method, and the as-proposed sensors exhibited stable gas response down to 6.75 ppm to H 2 S gas [18].…”

“…Zhang et al synthesized flower-like CuO/ZnO heterojunctions material by co-precipitation, the study revealed that the corresponding sensor could achieve the response of 9.68 to as low as 1 ppm ethanol [19]. Huang et al obtained porous CuO/ZnO material using a chemical solution method which exhibited higher response to 1 ppm formaldehyde [20]. However, as far as we know little attention has been given to the synthesis of 3D ZnO-CuO IO films and explored their exhaled breath sensing properties.…”

Flower-like hierarchical structures consisting of porous single-crystalline ZnO nanosheets and their gas sensing properties to volatile organic compounds (VOCs)

“…Jiang et al fabricated a cube-like Zn 2 SnO 4 hierarchical architecture assembled by nanoplates which exhibited much higher gas sensitivity than the normal Zn 2 SnO 4 nanoparticles because of its porous cube-like hierarchical structure [27]. As mentioned above, flower-like ZnO hierarchical structures are more advantageous for its facile preparation and high efficiency in gas sensing [28][29][30][31][32]. However, it is not enough for the hierarchical structures in gas sensing properties.…”

ZnO MICRORODS SURFACE-DECORATED BY WO3 NANORODS FOR ENHANCING NH3 GAS SENSING PERFORMANCE

“…D. Yang et al improved the NH 3 gas selectivity and sensitivity of the ZnO nanoparticles by doping with -Fe 2 O 3 nanoparticles [8]. The porous flower-like CuO/ZnO nanostructures exhibited a higher response and lower working temperature with certain organic vapors, such as ethanol, acetone, and formaldehyde, comparing with pure ZnO [9]. A Fe 2 O 3 mixed with ZnO thick film was observed to be highly sensitive to ammonia gas at 350 C and no cross response to other hazardous and polluting gases such as LPG, CO 2 , C 2 H 5 OH, H 2 and Cl 2 [10].…”