# Unique Triboelectric Nanogenerator Using Carbon Nanotube Composite Papers
## 3 Results
### Investigation of Performance Changes Due to Changes in CNT Composite Paper-Making Conditions
#### 3.2.2 Effect of Changes in Pulp Amount in CNT Composite Paper  
In this subsection, we consider how the triboelectricity generation performance changes with changing amounts of pulp in the samples obtained via the methods described in Section 2.3.2. Table 4 shows the typical properties of the fabricated CNT composite papers. The preparation conditions for each sample are described in Table 1. In the table below, a variation in the thickness of the resulting samples is again observed. The reason for this is the same as that described in Sections 3.1 and 3.2.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Sample No.** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** \\ \hline Sheet resistance [\(\Omega\)/sq.] & 1.130 & 7.603 & 6.617 & - & 1.357 & 5.817 & 8.303 & - \\ Thickness [mm] & 0.108 & 0.166 & 0.126 & 0.108 & 0.083 & 0.126 & 0.113 & 0.034 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Measured properties of fabricated CNT composite papers. For samples 4 and 8, without CNTs (0 mg of CNT), the resistance values cannot be measured because they exceeded the measurement limit of the resistance meter.  
Figure 8: RMS values of output derived from Figure 7.  
Figure 7: Triboelectricity output results for each CNT amount. (**a**) 5 mg, (**b**) 15 mg, (**c**) 30 mg, and (**d**) 0 mg.  
Figure 9 shows the results in terms of power generation using eight different types of CNT composite papers for TENGs with changes in the amount of pulp.  
Figure 9: _Cont._  
In the experiment, it was expected that increasing the amount of pulp from 100 mg to 200 mg would result in a significant increase in the output; however, contrary to this, there was no significant difference in the output. There was only a slight trend toward an increase in the output. This suggests that increasing the amount of pulp will increase the output, although it is presumed that there is a limit to this increase. In addition, for samples 4 and 8, which were pulp-only samples without CNTs, triboelectricity generation could be confirmed. While the waveform provided in Section 3.2.1 was dominated by noise, in these experiments, a waveform characteristic of triboelectricity generation was found. However, compared to the CNT composite paper examined under the same conditions, there was more noise. There is a possibility that a small amount of CNTs from other samples was accidentally incorporated at the time of fabrication. In terms of durability, increasing the amount of pulp rendered the CNT composite paper harder and stronger, and the output did not drop, even after repeated tapping over a long period of time. This may have occurred because the increased strength of the CNT composite paper ensured that the tapped surface  
Figure 10: RMS values of output derived from Figure 9.  
Figure 9: Comparison of output results from samples with different pulp volumes.  
remained even and stabilized the power generation (we believe that this was a problem associated with the apparatus).