Sensing energy band representation

Energy band representation of SnOj showing the different contributions to the work function of CO sensing in dry air conditions. Following symbols are used for the different parameters ... [Pg.42]

Figure 4.9. Sketch of CSTR representation of the SR model for 1 < Sc. Each wavenumber band is assumed to be well mixed in the sense that it can be represented by a single variable

$Figure 4.9. Sketch of CSTR representation of the SR model for 1 < Sc. Each wavenumber band is assumed to be well mixed in the sense that it can be represented by a single variable <p 2)n- Scalar energy cascades from large scales to the dissipative range where it is destroyed. Backscatter also occurs in the opposite direction, and ensures that any arbitrary initial spectrum will eventually attain a self-similar equilibrium form. In the presence of a mean scalar gradient, scalar energy is added to the system by the scalar-flux energy spectrum. The fraction of this energy that falls in a particular wavenumber band is determined by forcing the self-similar spectrum for Sc = 1 to be the same for all values of the mean-gradient source term.$

Fig. 2.3. Schematic view of a porous nanocrystaUine sensing layer with a one-dimensional representation of the energetic conduction band. A inter-grain band bending, eVs, occms as a consequence of smTace phenomena, and a band bending, eVc, occurs at the grain-electrode contact. Eb denotes the minimmn conduction band energy in the bulk tin oxide, and Ep is the Fermi-energy in the electrode metal...

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