[17p-F210-1~14] 9.3 Nanoelectronics

▼ [17p-F210-13] Dynamic Noise Fluctuation of Random Network Single-Walled Carbon Nanotubes/ Porphyrin-Sandwiched Polyoxometalates Complex

〇(M2)Detiza Goldianto Hernowo¹, Yoshito Yamazaki², Takuji Ogawa², Hirofumi Tanaka¹ (1.Kyushu Institute of Technology, 2.Osaka University)

Keywords:Polyoxometalate, Pulse generation, single-walled carbon nanotubes

Noise fluctuations in signal processing provides significant advantages in the development of brain-inspired electronic device. Low-dimensional carbon nanomaterials, such as carbon nanotubes, are good candidate for neural membrane devices owing to large electrical noise. Conjugated molecular wires containing single-walled carbon nanotubes (SWNT) and porphyrin (por)-polyoxometalate (POM) complex, SV₂W₁₀O₄₀[H₄t-BuTPP] and SV₂W₁₀O₄₀[H₄TPP], which exhibit reversible multi-electron redox properties has been demonstrated to provide tunable current fluctuation of pulse generation in order to accomplish complex computational task of brain computing.Firstly, we fabricated a random network of SWNT complex by using SV₂W₁₀O₄₀[H₄t-BuTPP] and SV₂W₁₀O₄₀[H₄TPP], respectively. In both complexes, one POM molecule is interacted by two non-equivalent tetraphenylporphyrin (TPP) molecules to compare with symmetric por-POM. Time dependence of current pass through the network showed that pulse generated under certain conditions as follows. The network of SV₂W₁₀O₄₀[H₄t-BuTPP] and SWNT complex can generate positive pulse at 50 V (Figure 1 (a)) and 75 V (Figure 1 (b)). On the other hand, the network of SV₂W₁₀O₄₀[H₄TPP] and SWNT complex can generate negative pulse at 15 V (Figure 2 (a)) and positive pulse at 100 V (Figure 2 (b)) indicating POM works by carrying charges and release the electron at 15 V, while this molecule induced hole to the network system at 100 V. Since general POM (PMo₁₂O₄₈) only show positive pulse at 150 V, H₄t-BuTPP case show similar behavior to POM at 50 V and H₄TPP at 100 V which might be caused by electric property of applied voltage.