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7 Mar 2011

Volume 98, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 98, 104101 (2011); http://dx.doi.org/10.1063/1.3560505 (3 pages)

Zhongchang Wang, Susumu Tsukimoto, Rong Sun, Mitsuhiro Saito, and Yuichi Ikuhara
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Atomic-scale Ti3SiC2 bilayers embedded in SiC: Formation of point Fermi surface

Zhongchang Wang, Susumu Tsukimoto, Rong Sun, Mitsuhiro Saito, and Yuichi Ikuhara

Appl. Phys. Lett. 98, 104101 (2011); http://dx.doi.org/10.1063/1.3560505 (3 pages) | Cited 2 times

Online Publication Date: 7 March 2011

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Semiconductor heterostructures provide a fertile ground for fascinating physical behaviors that are not present in their respective bulk constituents. Here we demonstrate, by combining advanced transmission electron microscopy with atomistic first-principles calculations, that an atomic-scale Ti3SiC2-like bilayer can be embedded in SiC interior, forming an atomically ordered multilayer that exhibits an unexpected electronic state with point Fermi surface. The valence charge is confined largely to within the bilayer in a spatially connected manner, serving possibly as a conducting channel to enhance the current flow over the semiconductor. Such a heterostructure with unusual properties is mechanically robust, rendering its patterning for technological applications likely.
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71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
71.20.Nr Semiconductor compounds
71.15.Mb Density functional theory, local density approximation, gradient and other corrections

The application of capillary force to a cantilever as a sensor for molecular recognition

T. I. Yin, Y. Zhao, C. F. Lin, H. H. Tsai, Y. Z. Juang, S. M. Yang, and G. A. Urban

Appl. Phys. Lett. 98, 104102 (2011); http://dx.doi.org/10.1063/1.3558730 (3 pages) | Cited 1 time

Online Publication Date: 11 March 2011

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This paper reports on a sensing mechanism created by converting a change in solid–liquid interfacial tension due to molecular interactions into a change in capillary force loading for a cantilever sensor design. Compared with former cantilever sensor designs based on surface stress measurement, the proposed mechanism takes advantage of capillary force to effectively amplify the signal output of the sensor by several orders of magnitude. A complementary-metal-oxide-semiconductor-based cantilever sensor design validates the proposed sensing mechanism. Detection of Biotin-NeutrAvidin specific binding in picomolar sample concentrations was demonstrated for the application of biochemical assay.
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87.80.Ek Mechanical and micromechanical techniques
68.03.Cd Surface tension and related phenomena
87.15.K- Molecular interactions; membrane-protein interactions
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