Co-MOF-74 derived Co3O4/graphene heterojunction nanoscrolls for ppb-level acetone detection

Efficient Co@Co3O4 core-shell catalysts for photocatalytic water oxidation and its behaviors in two different photocatalytic systems

“…As can be seen from Fig. 2, the XPS binding energies of Co 2p are 780.9 eV and 795.9 eV, which are corresponding to Co 2p3/2 and Co 2p1/2 of Co 3+ , respectively [54][55][56][57]. The peaks at 777.5 and 792.6 eV are ascribed to metallic Co. Two peaks observed at 782.3 and 798.2 eV, verifying the existence of Co 2+ in the sample [58][59][60].…”

“…As is clear from Fig. 8, the peak position of the metal Co is significantly lowered and the peak position of the Co 2+ is increased [56,57], so that the overall peak position is shifted as a result of partial conversion of elemental Co into Co 2+ in the water oxidation process. Combined with the results showed in Fig.…”

Porous materials applied to biomarker sensing in exhaled breath for monitoring and detecting non-invasive pathologies

“…More complex systems including heterojunctions are also attracting attention for breath analysis application. 42,[63][64][65][66] As an example, Marigold flower-like V2O5/CuWO4 heterojunctions were recently studied for the detection of ammonia in exhaled breath. 42 As another example, the α-Fe2O3-SnO2 heterostructure consisting of Fe2O3 nanorods dispersed in nanosheet arrays displayed good acetone sensing properties (high sensitivity, reproducibility, and selectivity).…”

High acetone sensing properties of In2O3–NiO one-dimensional heterogeneous nanofibers based on electrospinning

“…Due to their simple preparation process and low cost, metal-oxidesemiconductor sensors have been widely used in the detection of acetone gas. 2,3 NiO is a p-type semiconductor, which has been used as a sensing material for VOCs sensors, because of the high VOCs catalytic activity and oxygen adsorption characteristics. [4][5][6] The previous report has shown that the gas-sensing performance of p-type metal oxides is much lower than that of the n-type metal oxides.…”