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Figure 2: Influence of the PDMS triboelectric layer thickness on the output (a) voltage, (b) current and (c) power generated as a function of the load resistance. (d) Maximum output power generated for the contact-separation mode of different PDMS and Nylon plates. 3.2. Area of the Triboelectric Surfaces To investigate the relationship between the electric outputs and the area of the triboelectric surfaces, a set of systematic measurements was also performed. In this study, we changed the areas of the triboelectric materials between 2.5 and 15 cm2. Similar to the previous study, we used a PDMS-Nylon tribo-pair, although in this study the thickness of the PDMS remained constant (= 32 μm). In Fig. 3(a), it is possible to observe the open-circuit voltage for the four different values of triboelectric surface area, clearly demonstrating an increase of the voltage peaks with increasing contact area. In Fig. 3(b) are represented the short-circuit currents obtained for the same triboelectric surface areas. The output current also increases with the increase of the contact area, due to the increased amount of transferred charges. Similarly, we proceeded to calculate the average of the voltage and current peak values for the different areas of the triboelectric surfaces [Figs. 3(c) and (d)]. Figure 3(c) shows the values of the mean open-circuit voltage generated for the Nylon-PDMS pair in the contact-separation mode. The maximum value of the generated voltage was 1.2 V and occurred for a surface area of 15 cm2. The maximum generated current was 0.43 μA for a contact area of 15 cm2 [Fig. 3(d)]. Thus, we observed that the increase of the macroscopic contact area leads to the increase of the output voltage and current. We again measured the electric outputs for the four different areas when connected to variable load resistances (from 100 to 1 GΩ; not shown). As expected, the voltage has maximum values (1.2 V) at high resistances, whereas the current reaches maximum values (0.43 μA) for small resistances. The area dependence of the maximum power is shown in the inset of Fig. 3(d), displaying a linearly increasing 4PDF Image | Performance of PDMS-Based Triboelectric Nanogenerators
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