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International Conference on Mechanical, Materials and Renewable Energy IOP Publishing IOP Conf. Series: Materials Science and Enginee1ri2n3g4357678(920‘1’8“)” 012186 doi:10.1088/1757-899X/377/1/012186 charge transfer. The plasma placed between the two metal plates acted as a parallel plate capacitor, which helped in more charge storage. Hence the output efficiency is increased [32]. Table 1: The average surface roughness of PDMS films after the plasma treatment [32] Table 2: The transferred charge for each specimen in one contact-separate cycle The table 1 shows the average surface roughness of PDMS films after the plasma treatment which is used to enhance the surface morphology, with less power and more time duration of treatment better surface roughness can be achieved. Table 2 shows the transferred charge for each specimen in one contact-separate cycle which reveals for less power treated surface there is the maximum charge transfer due to maximum surface roughness [32]. 2.4.3 Enhancement of surface charge density by Laser treatment A femtosecond laser can be used to enable microstructure on the (PDMS) layer. The microstructure pattern on the PDMS surface increases the contact area between the polymer layer and the metal electrode, thereby increasing the output power of the device. As compared to a normal TENG the efficiency of TENG increased with moderate laser power and decreased with large laser power. Due to large laser power, deep surface area patterns are formed which decreases the surface area of contact, resulting in a decrease in charge density hence the efficiency decreases [33]. Yu et al. prepared a TENG using electrospun polymer mats and spongy parenchyma-like structure. Electrospinning method was used to develop nanostructured mats. The benefits of the electrospun mats are large surface area, roughness, and better flexibility. The treatment of the mats resulted in an increase of the output voltage by three times [34]. Park et al. Conducted an experiment and found that surface relief 11PDF Image | Critical Review on Triboelectric Nanogenerator
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