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6 Feb 2012

Volume 100, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 100, 061101 (2012); http://dx.doi.org/10.1063/1.3665180 (3 pages)

I. E. Khodasevych, C. M. Shah, S. Sriram, M. Bhaskaran, W. Withayachumnankul, B. S. Y. Ung, H. Lin, W. S. T. Rowe, D. Abbott, and A. Mitchell
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Highly piezoelectric biocompatible and soft composite fibers

J. Morvan, E. Buyuktanir, J. L. West, and A. Jákli

Appl. Phys. Lett. 100, 063901 (2012); http://dx.doi.org/10.1063/1.3683482 (4 pages) | Cited 3 times

Online Publication Date: 8 February 2012

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We report the fabrication of highly piezoelectric biocompatible soft fibers containing barium titanate ferroelectric ceramic particles dispersed in electrospun poly lactic acid (PLA). These fibers form mats that have two orders of magnitude larger piezoelectric constant per weight than single crystal barium titanate films. We propose that the observed apparent piezoelectricity results from the electrospinning induced polar alignment of the ferroelectric particles that pole the fibers similar to ferroelectret polymer foams that are poled by corona discharge. Due to the biocompatibility of PLA that encases the ferroelectric particles, these mats can be used in biological applications such as bio-sensors, artificial muscles, and energy harvesting devices.
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77.65.Bn Piezoelectric and electrostrictive constants
77.84.Cg PZT ceramics and other titanates
82.70.Rr Aerosols and foams
77.22.Ej Polarization and depolarization

Wavelength-selective and diffuse emitter enhanced by magnetic polaritons for thermophotovoltaics

L. P. Wang and Z. M. Zhang

Appl. Phys. Lett. 100, 063902 (2012); http://dx.doi.org/10.1063/1.3684874 (3 pages) | Cited 3 times

Online Publication Date: 9 February 2012

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Both wavelength selectivity and directional insensitivity are highly desired in thermophotovoltaic applications. A concept of a magnetic-polariton-enhanced thermophotovoltaic emitter is presented. The predicted normal emittance from such a nanoengineered surface exceeds 0.8 in the wavelength region from 0.62 to 1.98 μm and is below 0.2 at wavelengths longer than 2.4 μm. Furthermore, thermal emission from the proposed structure is diffuse-like as the emittance changes little with the direction up to 75° from the normal. The strip width allows tuning of the emittance spectrum to match particular photovoltaic cells to potentially enhance power generation with improved conversion efficiency.
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84.60.Jt Photoelectric conversion
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