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3 Oct 2011

Volume 99, Issue 14, Articles (14xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 141901 (2011); http://dx.doi.org/10.1063/1.3644948 (3 pages)

G. Kozlowski, P. Zaumseil, M. A. Schubert, Y. Yamamoto, J. Bauer, J. Matejova, T. Schulli, B. Tillack, and T. Schroeder
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Anomalous resonant frequency changes in piezoelectric microcantilevers by monolayer formation of Au films

Jeong Hoon Lee, Kyo Seon Hwang, Dae Sung Yoon, Hyungsuk Kim, Seung-Ho Song, Ji Yoon Kang, and Tae Song Kim

Appl. Phys. Lett. 99, 143701 (2011); http://dx.doi.org/10.1063/1.3621825 (3 pages) | Cited 2 times

Online Publication Date: 3 October 2011

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Although the resonant frequency of a microcantilever has been reported to be changed by surface stress and/or flexural rigidity, the reasons still remained unclear. Here, we present an observation of anomalous resonant frequency change with positive values at 3.25 Å thickness of Au, where it represents the monolayer formation of Au films. This result illustrates the surface stress-dependence of the resonant frequency. The thickness at where the resonant frequency shift would become zero through the compensation of the mass, and the surface stress is expected to be approximately three monolayers (9.7 Å).
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77.65.-j Piezoelectricity and electromechanical effects
68.47.Pe Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces
62.20.F- Deformation and plasticity

Zirconia grafted carbon nanotubes based biosensor for M. Tuberculosis detection

Maumita Das, Chetna Dhand, G. Sumana, A. K. Srivastava, N. Vijayan, R. Nagarajan, and B. D. Malhotra

Appl. Phys. Lett. 99, 143702 (2011); http://dx.doi.org/10.1063/1.3645618 (3 pages) | Cited 2 times

Online Publication Date: 6 October 2011

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Zirconia (ZrO2) grafted multiwalled carbon nanotubes (CNTs) (crystallite size of ZrO2 ∼ 28.63 nm), obtained via isothermal hydrolysis of zirconium oxychloride in presence of CNT, have been electrophoretically deposited onto indium-tin-oxide (ITO) coated glass plate. High resolution electron microscopic investigations reveal assemblage of the ZrO2 nanostructure inside and around CNT cavities. Electrochemical impedance spectroscopic studies indicate ∼3.5 fold enhancement in charge transfer behaviour of NanoZrO2-CNT/ITO electrode compared to that of NanoZrO2/ITO electrode. Considering the synergy between biocompatible ZrO2 and electrochemically superior CNT, this nanobiocomposite has been explored to develop an impedimetric nucleic acid biosensor for M. Tuberculosis detection.
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87.85.Rs Nanotechnologies-applications
82.45.Qr Electrodeposition and electrodissolution
82.80.Fk Electrochemical methods

Controlled transport of superparamagnetic beads with spin-valves

Wendy R. Altman, John Moreland, Stephen E. Russek, Bruce W. Han, and Victor M. Bright

Appl. Phys. Lett. 99, 143703 (2011); http://dx.doi.org/10.1063/1.3645615 (3 pages)

Online Publication Date: 7 October 2011

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Trapping, release, and transport of individual, or ensembles of, 2.8 μm superparamagnetic beads (SPB) functionalized with streptavidin were demonstrated with an addressable array of spin-valve (SV) traps integrated into a microfluidic channel. The linear array consists of two staggered lines of 1 μm × 8 μm SVs toggled “on” or “off” with 10 ms and 150 mA or −100 mA current pulses, respectively. The SPB is trapped when the SV is “on” and released or ignored when the SV is “off”. This “switchable permanent magnet” offers a low power alternative to other precision microfluidic transport devices.
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87.80.Ek Mechanical and micromechanical techniques
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
87.14.E- Proteins
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