[19a-E302-1~10] 12.2 Characterization and Materials Physics

▼ [19a-E302-1] Characterisation on Spontaneous Redox-state Transition Property of
Phosphomolybdic Acid Molecule Functionalised on Carbon Nanotube

〇(M2C)KianLian Goh Goh, Yuji Kuwahara, Megumi Akai-Kasaya

Keywords:Nanomaterials

Phosphomolybdic acid (hereinafter PMo₁₂) molecule displays 24-electron multi-redox property. Despite various researches have been conducted on PMo₁₂, the charge transport process through PMo₁₂ molecule has not been examined comprehensively. Therefore, we created a system that is made up of CNT/PMo₁₂ device in order to study the charge transport process through PMo₁₂. A.C. dielectrophoresis technique was applied to position few CNTs across 1μm-gapped electrodes. This device was then soaked in PMo₁₂ solution to allow the formation of “PMo₁₂ junction” between CNT and electrode. When DC bias of few tens of millivolt was applied to this CNT/PMo₁₂ device, we observed output current response with spontaneous transition between “OFF state” at nearly 0 A and “ON state” at certain maximum current range, accompanied by occasional appearance of intermediate states. This spontaneous switching in conductance is speculated to originate from the spontaneous redox-state transition of a single PMo₁₂ junction, suggesting that the multi-redox property governs the charge transport process through PMo₁₂. This newly discovered relationship deserves further analysis for the fundamental understanding and characterisation on the multi-redox property of PMo₁₂.