In the case of the NCG devices
with carbon nanomaterials (Figures 4 a-ii
and 1 c), the BaTiO 3 NPs can be well distributed
by forming a complex mixture with
CNT networks; as a results, a high output
voltage is generated (Figure 4 b-ii). The above
theories are well supported by the comparative
results of the measured output voltage
of devices with and without CNT networks
(Figures 4 b-i and ii).