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FE-SEM images of (a) cuboid-shape monoclinic WO3 nanocrystal and (b) hexagonal-shape hexagonal WO3 nanocrystal. Sensor response as a function of NO2 concentration for (c) cuboid-shape WO3 and (d) hexagonal-shape WO3. XPS spectra of O 1s on the surface of (e) as-prepared cuboid-shape WO3 and (f) hexagonal-shape WO3.
Source publication
Morphological control of metal oxide (MO) is important for enhancement of sensing properties such as sensor response and response-recovery characteristics. [...]
Contexts in source publication
Context 1
... film sensor with cuboid-shape monoclinic WO3 nanocrystal ( Figure 1a) showed sensor response (Rg/Ra) of 10 2 -10 4 to 0.05-1 ppm NO2 at 200 °C (Figure 1c). In contrast, the sensor with hexagonal-shape hexagonal WO3 nanocrystal (Figure 1b) showed sensor response lower one order of magnitude than that with cuboid-shape monoclinic WO3 in above same detection condition ( Figure 1d). ...
Context 2
... film sensor with cuboid-shape monoclinic WO3 nanocrystal ( Figure 1a) showed sensor response (Rg/Ra) of 10 2 -10 4 to 0.05-1 ppm NO2 at 200 °C (Figure 1c). In contrast, the sensor with hexagonal-shape hexagonal WO3 nanocrystal (Figure 1b) showed sensor response lower one order of magnitude than that with cuboid-shape monoclinic WO3 in above same detection condition ( Figure 1d). ...
Context 3
... film sensor with cuboid-shape monoclinic WO3 nanocrystal ( Figure 1a) showed sensor response (Rg/Ra) of 10 2 -10 4 to 0.05-1 ppm NO2 at 200 °C (Figure 1c). In contrast, the sensor with hexagonal-shape hexagonal WO3 nanocrystal (Figure 1b) showed sensor response lower one order of magnitude than that with cuboid-shape monoclinic WO3 in above same detection condition ( Figure 1d). This difference was related to surface states. ...
Context 4
... film sensor with cuboid-shape monoclinic WO3 nanocrystal ( Figure 1a) showed sensor response (Rg/Ra) of 10 2 -10 4 to 0.05-1 ppm NO2 at 200 °C (Figure 1c). In contrast, the sensor with hexagonal-shape hexagonal WO3 nanocrystal (Figure 1b) showed sensor response lower one order of magnitude than that with cuboid-shape monoclinic WO3 in above same detection condition ( Figure 1d). This difference was related to surface states. ...
Context 5
... difference was related to surface states. XPS spectra of O1s showed that the content of OHwas larger for hexagonal-shape hexagonal WO3 (O 2− /OH − /H2O (in %) = 60.0/38.1/1.9, in Figure 1e) than for cuboid-shape monoclinic WO3 (80.4/4.9/14.7, in Figure 1f). The results suggested that the high content of oxygen adsorbate (O 2− ) on the surface of WO3 could be contributed to higher sensor response. ...
Context 6
... difference was related to surface states. XPS spectra of O1s showed that the content of OHwas larger for hexagonal-shape hexagonal WO3 (O 2− /OH − /H2O (in %) = 60.0/38.1/1.9, in Figure 1e) than for cuboid-shape monoclinic WO3 (80.4/4.9/14.7, in Figure 1f). The results suggested that the high content of oxygen adsorbate (O 2− ) on the surface of WO3 could be contributed to higher sensor response. ...
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Citations
... The nanostructured metal oxides have become most attractive due to their unusual properties compared to their bulk form. In recent research, the morphologically controlled materials fabricated due to its properties and working ability strongly related to its shape, size and a high surface area in nanostructures [5]. ...
... AFM results show that with the addition of the NaDCC to WO3/ITO thin films they have less roughness and porosity, Roughness of WO3/ITO surface was (6.1) nm, while in the WO3@NaDCC/ITO surface was (5.28)nm. Table(3), figure (5),shows the size of grains, roughness, and root means square. ...
