Controllable synthesis of α-Fe2O3 micro-flowers with enhanced gas sensitivity to acetone

Accelerating the Gas–Solid Interactions for Conductometric Gas Sensors: Impacting Factors and Improvement Strategies

“…The morphology difference lies in porosity, specific surface area, and reactive surface sites that affect gas adsorption, diffusion, reaction, and desorption. In general, sensing materials with hollow, porous, core-shell, or nanosheet-like morphology [36][37][38] harbor a large degree of porosity and high specific surface area, which is beneficial for facilitating gas transport within the materials and accelerating the gas-solid reactions [39,40]. In addition, low-dimensional nanomaterials could effectively suppress the scattering behavior of charge carriers and lengthen their mean free path as compared to bulk materials, also contributing to a fast response/recovery feature.…”

“…The combination of internal and external voids benefited a large specific surface area and faster response time (recovery time) ranging from 8 to 26 s (1 to 16 s) at 120 to 300 • C [31]. In addition, Zhang et al [40] prepared a series of α-Fe 2 O 3 samples and tuned the morphology by changing the amount of added ethylene glycol during the synthesis process. When the added amount was increased from 30 mL to 110 mL, the product assembled by the two-dimensional nanochip was converted into a three-dimensional porous α-Fe 2 O 3 micro flower.…”

Fe2O3 for stable K-ion storage: mechanism insight into dimensional construction from stress distribution and micro-tomography

“…To obtain flower-like structures with uniform size and complete structure, the appropriate ethylene glycol concentration is required to provide proper nucleation and hydrolysis rates. 38 The flower-like Fe 2 O 3 with an average diameter of 2 microns (Fig. S2, ESI †) was prepared by the hydrothermal method and calcination.…”