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13 Aug 2012

Volume 101, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 101, 071104 (2012); http://dx.doi.org/10.1063/1.4742749 (4 pages)

Judson D. Ryckman and S. M. Weiss
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Wireless power transfer to a cardiac implant

Sanghoek Kim, John S. Ho, Lisa Y. Chen, and Ada S. Y. Poon

Appl. Phys. Lett. 101, 073701 (2012); http://dx.doi.org/10.1063/1.4745600 (4 pages)

Online Publication Date: 13 August 2012

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We analyze wireless power transfer between a source and a weakly coupled implant on the heart. Numerical studies show that mid-field wireless powering achieves much higher power transfer efficiency than traditional inductively coupled systems. With proper system design, power sufficient to operate typical cardiac implants can be received by millimeter-sized coils.
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87.85.-d Biomedical engineering
02.70.Bf Finite-difference methods

Practical protein removal using atmospheric-pressure helium plasma for densely packed gold nanoparticle arrays assembled by ferritin-based encapsulation/transport system

Tatsuya Hashimoto, Nobuyuki Zettsu, Bin Zheng, Megumi Fukuta, Ichiro Yamashita, Yukiharu Uraoka, and Heiji Watanabe

Appl. Phys. Lett. 101, 073702 (2012); http://dx.doi.org/10.1063/1.4745508 (5 pages) | Cited 1 time

Online Publication Date: 14 August 2012

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We propose using atmospheric-pressure helium (AP He) plasma to efficiently remove the ferritin protein shells surrounding gold nanoparticles (GNPs). The high density GNPs assembled on a substrate by using a ferritin-based encapsulation/transport system were exposed to He radicals with a high internal energy to decompose their outer protein shells. In contrast to the conventional methods, AP-plasma treatment was found to suppress the aggregation of adjacent GNPs and produce densely packed and isolated GNP arrays. Consequently, we obtained an intense and sharp surface plasmon band from the plasma-treated GNP arrays. The clear response of their plasmonic behavior according to a refractive index of the surrounding media demonstrated that the proposed method had a significant advantage when fabricating GNP-based plasmonic devices.
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87.14.E- Proteins
73.22.Lp Collective excitations
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
87.53.-j Effects of ionizing radiation on biological systems

A transistor-based biosensor for the extraction of physical properties from biomolecules

Sungho Kim, David Baek, Jee-Yeon Kim, Sung-Jin Choi, Myeong-Lok Seol, and Yang-Kyu Choi

Appl. Phys. Lett. 101, 073703 (2012); http://dx.doi.org/10.1063/1.4745769 (4 pages)

Online Publication Date: 14 August 2012

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An analytical technique is proposed that uses an asymmetric double-gate field-effect transistor (FET) structure to characterize the electrical properties of biomolecules, including their permittivity and charge density. Using a simple measurement with the proposed FET structure, we are able to extract the physical properties (i.e., permittivity and charge density) of biomolecules. A reliable analytical tool for the characterization of biomolecules can be provided by the proposed FET structure without a complex measurement system. It is expected that the proposed method will be expanded into a universal analysis technique for the electrical evaluation of biomolecules in applications beyond biosensing.
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85.65.+h Molecular electronic devices
87.15.-v Biomolecules: structure and physical properties
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