Electrospinning preparation and photophysical properties of one-dimensional (1D) composite nanofibers doped with erbium(III) complexes

Nanosized TiO2 has been actively developed as a low-cost and environment-friendly anode material for lithium-ion batteries (LIBs), but its poor electronic conductivity seriously restricts its practical applications. This drawback is addressed in this work by the fabrication of one-dimensional mesoporous graphene@Ag@TiO2 composite nanofibers as anode materials for high-performance LIBs. The materials were prepared via electrospinning combined with annealing treatment, and the effects of graphene addition on the microstructure and electrochemical performance of the resulting mesoporous graphene@Ag@TiO2 nanofibers were investigated in detail. Ag@TiO2 nanofibers with the optimal amount of graphene displayed a maximum initial discharge capacity of [Formula: see text] at [Formula: see text] and retained a discharge capacity of [Formula: see text] at [Formula: see text] after 100 cycles. These results reflect the excellent cycling stability of the material. The average specific discharge capacity of the nanofibers ([Formula: see text] at [Formula: see text] was two-fold higher than that of samples without graphene, and their discharge capacity returned to [Formula: see text] (approximately [Formula: see text] for other nanofibers) when the current density was recovered to the initial value ([Formula: see text]. Electrochemical impedance spectroscopic measurements confirmed that the conductivity of the electrode was [Formula: see text], which is higher than that of bare mesoporous Ag@TiO2 ([Formula: see text]). Thus, one-dimensional mesoporous graphene@Ag@TiO2 nanofibers can be regarded as a promising anode material for LIBs.

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Electrospinning preparation and characterization of a new kind of composite nanomaterials: One-dimensional composite nanofibers doped with TiO2 nanoparticles and Ru(II) complex

Materials Research Bulletin ◽

10.1016/j.materresbull.2009.07.010 ◽

2009 ◽

Vol 44 (11) ◽

pp. 2081-2086 ◽

Cited By ~ 8

Author(s):

Lina Liu ◽

Bin Li ◽

Jin Zhang ◽

Ruifei Qin ◽

Haifeng Zhao ◽

...

Keyword(s):

Tio2 Nanoparticles ◽

Composite Nanofibers ◽

Composite Nanomaterials ◽

One Dimensional

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Investigation of the Photophysical Properties of a Eu3+ Coordination Polymer Bearing an α-Nitrile Substituted β-Diketonate Ligand via Emission and Ultrafast Transient Absorption Spectroscopy

Australian Journal of Chemistry ◽

10.1071/ch15253 ◽

2015 ◽

Vol 68 (9) ◽

pp. 1392 ◽

Cited By ~ 4

Author(s):

Brodie L. Reid ◽

Evan G. Moore ◽

Brian W. Skelton ◽

Mark I. Ogden ◽

Massimiliano Massi

Keyword(s):

Coordination Polymer ◽

Absorption Spectroscopy ◽

Transient Absorption ◽

Photophysical Properties ◽

Transient Absorption Spectroscopy ◽

Quantum Yields ◽

Metal Centre ◽

Antenna Effect ◽

One Dimensional ◽

Polymer Bearing

Reaction of the β-diketone ligand, 2-cyano-1,3-phenyl-1,3-propandione (LH), with hydrated EuCl3 in the presence of 1,10-phenanthroline (Phen), results in the crystallisation of a one-dimensional Eu3+ coordination polymer of formulation [Eu(Phen)(L)3]∞, formed by coordination of the nitrile group of an O,O′-bound ligand to a neighbouring metal centre. An investigation of the metal-centred emission of the polymer, both in the solid state and solution, revealed red emission characterised by relatively long-lived excited state lifetimes and high intrinsic quantum yields. However, analysis of the overall quantum yield and sensitisation efficiency reveals that ultrafast processes in the ligand potentially inhibit Eu3+ sensitisation. Further investigations into these processes using transient absorption spectroscopy suggest that substitution at the α-C position may significantly decrease sensitisation via the antenna effect.

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