Recent advances in flower-like nanomaterials: Synthesis, characterization, and advantages in gas sensing applications

Controllable synthesis of flower-like hierarchical porous TiO2 at room temperature and its affinity application

“…According to the environment in which FHP particles are synthesised, synthesis methods can be classified as the emulsion synthesis method, biphasic stratification method and aqueous solution method. 5,6 The emulsion synthesis method uses hexadecyl trimethyl ammonium chloride as the cationic surfactant template through the emulsion synthesis system, stirring the aqueous phase at low temperature for 60 h, and then adding the oil phase containing the monomer tetraethyl orthosilicate (TEOS) at 60 1C for 12 h. 7 The emulsion method facilitates the production of a core-shell structure. [8][9][10][11] Another advantage is the ability to produce asymmetric nanoparticles, which are of interest in many fields.…”

Wireless Gas Sensor Based on the Mesoporous ZnO–SnO2 Heterostructure Enables Ultrasensitive and Rapid Detection of 3-Methylbutyraldehyde

“…The selection of SMOs, such as SnO 2 , ZnO, WO 3 , NiO, and CuO, plays a pivotal role in determining the sensing performance of such chemiresistive gas sensors. , Among them, ZnO and SnO 2 are both n-type semiconductors and have been widely used as gas sensors to detect different kinds of gaseous compounds. Moreover, constructing ZnO–SnO 2 heterojunctions has been widely accepted as a feasible method to enhance the gas sensing performance. , When metal oxides with different energy band structures are hybridized, heterojunctions (i.e., n–n and p–n) would be formed, resulting in the redistribution of electrons or holes and adjustment of the depletion/accumulation layer of SMOs. − This ultimately manifests as the change of material resistance and surface chemisorbed oxygen species, which significantly improve the gas sensing performance. − However, as far as our current knowledge extends, SMO gas sensors have not yet been employed for the detection of 3-methylbutyraldehyde vapor.…”

“…Moreover, constructing ZnO−SnO 2 heterojunctions has been widely accepted as a feasible method to enhance the gas sensing performance. 21,22 When metal oxides with different energy band structures are hybridized, heterojunctions (i.e., n− n and p−n) would be formed, resulting in the redistribution of electrons or holes and adjustment of the depletion/ accumulation layer of SMOs. 23−25 This ultimately manifests as the change of material resistance and surface chemisorbed oxygen species, which significantly improve the gas sensing performance.…”

Construction of semiconductor nanocomposites for room-temperature gas sensors

“…[12][13][14] Recent research has emphasized the crucial function of nanocomposite materials in improving sensitivity, selectivity, and response and recovery times. [15][16][17][18] Nanostructured materials play a crucial role in the advancement of gas-sensing platforms operating at room temperature. 19,20 Scholars are continuously investigating synthesis methods to accurately regulate the chemical composition, microstructure, and morphology, as well as fundamental design principles to elucidate the underlying mechanisms of these materials.…”