Dielectric properties are one of the important properties of materials. When the material is in an alternating electric field, the material will polarize inside. This polarization process has a lag response time to the alternating electric field, namely the relaxation time. Long relaxation time, it will have a larger dielectric loss. The particle size of nanomaterials has a great influence on the dielectric constant and dielectric loss. The dielectric constant is also closely related to the frequency of the alternating electric field. For example, under the action of an electric field with a low frequency, the dielectric constant of nano-TiO 2 increases with the increase of the particle size and reaches the maximum and then decreases. The maximum dielectric constant is 17.8 nm. In general, nanomaterials have larger dielectric constants than bulk materials, and materials with a large dielectric constant can be used to manufacture large-capacity capacitors, or to reduce the volume at the same capacity, which has led to the miniaturization of electronic devices Very useful.
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