Photomagnetic Carbon Nanotubes: Preparation and Analysis

• Main Authors: Lin, Zih-Jing, 林子晶
• Other Authors: Wang, Chong-Mou
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/79969698734655744713

碩士 === 國立臺灣師範大學 === 化學系 === 103 === Bis(2,2'-bipyridine)-5-amino-1,10-phenanthroline ruthenium(II) (Ru(bpy)2(NH2-phen)2+) is an MLCT complex, possessing a long-lived triplet state in water and a structure analogous to Ru(bpy)32+. When Ru(bpy)2(NH2-phen)2+ was subjected to diazotization in the presence of carbon nanotubes (CNTs), it formed nanodots on the CNTs, rendering the resulting tubes (Ru@CNT) capable of transducing photo stimuli (473 nm) into electricity and magnetism at ambient conditions. The increased functionality was highly reproducible, confirmed by the conductive-mode AFM, vibrating sample magnetometry (VSM), and AC susceptibility analysis. Local magnetism probing of the Ru@CNT with the magnetic-mode AFM techniques (MFM) indicated that the magnetism was originating from the photoexcited nanodots. The resulting phase shift behaved as a function of the luminous power and the voltage (Vb) of the electrical bias applied to the Ru@CNT. The Vb dependence deviated from the expected quadratic correlation, suggesting that the formation of the triplet state at the nanodots could be a limiting factor for the photomagnetism. Nevertheless, the Ru@CNT tubes showed mobility toward an external magnet when exposed to visible light on water. The Ru@CNT is thus shown as a multifunctional material that might be useful in spintronics.