Photomagnetic Carbon Nanotubes at Ambient Conditions

Wei Shen Lin, Yueh Hua Han, Ting Yu Chang, Chong Mou Wang, Cheng Hsun Tony Chang, Jyh-Shen Tsay

研究成果: 雜誌貢獻文章

4 引文 斯高帕斯(Scopus)

摘要

Bis(2,2-bipyridine)-5-amino-1,10-phenanthroline ruthenium(II) (Ru(bpy)2(phen-NH2)2+), an MLCT complex, has a long-lived triplet state in water (λex: 473 nm; λem: 620 nm; τ = 615 ns; Pdbl = 1 relative to that of Ru(bpy)32+) and a structure analogous to Ru(bpy)32+. When Ru(bpy)2(phen-NH2)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, as evidenced by conductive-mode AFM, vibrating sample magnetometry (VSM), and AC susceptibility analysis. The local magnetism probing of the Ru@CNT with magnetic-mode AFM techniques (MFM) indicated that the magnetism originated from the unpaired electrons formed on 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, confirming that the formation of the photoinduced charge separation state at the nanodots is responsible for the photomagnetism. The Ru@CNT tubes showed mobility toward external magnets (65 G) when floating on water and under 473 nm illumination. The Ru@CNT thus appears to be a multifunctional material that might be useful in spintronics.

原文英語
頁(從 - 到)20673-20680
頁數8
期刊Journal of Physical Chemistry C
119
發行號35
DOIs
出版狀態已發佈 - 2015 八月 17

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

指紋 深入研究「Photomagnetic Carbon Nanotubes at Ambient Conditions」主題。共同形成了獨特的指紋。

  • 引用此