“…The 187 ppb corresponds to the ozone level that the sensor can measure with certainty, with 54% sensitivity. The position of our sensing element among the other reported semiconducting materials for ozone sensing 30,[64][65][66][67][68][69][70][71][72][73] is illustrated in Fig. 3.…”
Section: Sensing Properties Of the Metal Halide Nanocubesmentioning
“…The 187 ppb corresponds to the ozone level that the sensor can measure with certainty, with 54% sensitivity. The position of our sensing element among the other reported semiconducting materials for ozone sensing 30,[64][65][66][67][68][69][70][71][72][73] is illustrated in Fig. 3.…”
Section: Sensing Properties Of the Metal Halide Nanocubesmentioning
“…As shown in Fig. 3a, for pure Ni-Al LDH HSS, the peaks at 2θ values of 11.52°, 24.16°, 33.66°, 36.16 °, 59.96° and 60.6° could be respectively attributed to the (003), (006), (012), (015), (110) and (113) of the CO 3 2− LDH phases 37,38 . The HCS only showed two peaks located at 23.16° and 43.44°, corresponding to the typical graphitic (002) and (101) planes 39–42 For C@Ni-Al LDH HSS, the (003), (006), (012), (015), (110) and (113) crystal phases of the Ni-Al LDH HSS structure and the (002) and (101) crystallographic planes of the HCS structure were clearly exhibited, indicating that the Ni-Al LDH was successfully assembled on the HCS surface.Figure 3XRD patterns ( a ) and wide scan of XPS spectra ( b ) of HCS, Ni-Al LDH HSS and C@Ni-Al LDH HSS.…”
In this paper, a double hollow spherical shell composite modified with layered double hydroxide (C@Ni-Al LDH HSS) was fabricated for uranium(VI) (U(VI)) adsorption. Various batch experiments were carried out to investigate the influence of pH, concentration, time and coexistence ion on extraction. The results showed that the adsorption processes of U(VI) onto C@Ni-Al LDH HSS were spontaneous and endothermic and closely followed pseudo-second-order and Langmuir isotherm models. The equilibrium time and maximum adsorption capacity of C@Ni-Al LDH HSS was 360 min and 545.9 mg g
−1
. FT-IR and XPS analyses proved that the adsorption behavior was primarily attributed to the strong interaction between oxygen-containing functional groups and U(VI). Moreover, the extraction of trace U(VI) (μg L
−1
) in artificial and natural seawater was also studied. The results showed that C@Ni-Al LDH HSS provided a promising application for the efficient extraction of U(VI) from seawater.
The sub-ppm ozone (O 3 ) sensitivity of pure cuprous (Cu 2 O) thin films based sensors have been investigated by utilizing conductivity measurements at different temperatures varies from 150 to 200°C. The structural and morphological properties of Cu 2 O sensitive layers have been investigated by the scanning electron microscope (SEM) and x-ray diffraction (XRD) respectively. The detection properties of Cu 2 O layers have been strongly altered by the electrode geometries and sensitive layer thickness. The sensors' responses and structural investigations revealed that the ozone sensitivity has improved with the increase in the degree of crystallinity along the preferential direction (111). Abinitio calculation shows that O 3 adsorption mechanism could be semi-dissociative of O 3 molecule on the Cu 2 O (111) surface, giving O 2 molecule remaining in interaction with the surface and an adsorbed oxygen O ads .
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