Influence of particle size on H 2 and H 2 S sensing characteristics of nanocrystalline nickel ferrite

Role of Ruthenium in the Dielectric, Magnetic Properties of Nickel Ferrite (Ru–NiFe2O4) Nanoparticles and Their Application in Hydrogen Sensors

“…4 at an optimum sensing temperature of 200 °C 23. Mitra et al reported hydrogen gas-sensing properties of ZnFe 2 O 4 at 200 °C 62. Our previous report on Li−NiFe 2 O 4 demonstrated an optimum sensing temperature at 200 °C.…”

Ordered mesoporous NiFe2O4 with ultrathin framework for low-ppb toluene sensing

“…3 nm), the volume of space charge layer would be comparable to the volume of particle and more charge carriers could be influenced by gas exposure, thus leading a higher response [57]. Ghosh et al [58] have also reported the response enhancement of NiFe 2 O 4 nanoparticles with reduced size from 52.55 to 5.35 nm for detecting H 2 and H 2 S. Indeed, bulk NiFe 2 O 4 exhibited a very poor gassensing performance in the detection of toluene, whose response toward toluene with concentration below 100 ppb was almost negligible (Fig. 4d), whereas the mesoporous NiFe 2 O 4 replicas consist of coupled or uncoupled subframework, whose thickness (5-8.5 nm) is comparable to twice the thickness of space charge layer, and specific surface area is much larger than that of their bulk counterparts, and thus exhibit significantly enhanced response with reducing the framework thickness ( Fig.…”

Recent Progress in Spinel Ferrite (MFe2O4) Chemiresistive Based Gas Sensors

“…Notably, the co-precipitated sample demonstrated a higher sensing response of 36%, whereas the sol-gel combusted sample achieved a sensing response of 24%. Ghosh et al [78] reported nanocrystalline NiFe 2 O 4 (Figure 3c) through the sol-gel auto-combustion method. Ball milling was performed at room temperature and particle size was controlled to optimize the sensitivity of H 2 and H 2 S. The experimental results show that there was a notable enhancement in the gas response when the particle size was reduced or the specific surface area was increased (Figure 3d).…”