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11 Dec 2006

Volume 89, Issue 24, Articles (24xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 89, 242109 (2006); http://dx.doi.org/10.1063/1.2405843 (3 pages)

Carlo R. da Cunha, Nobuyuki Aoki, Takahiro Morimoto, Yuichi Ochiai, Richard Akis, and David K. Ferry
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Enhanced amperometric detection of glucose using Si29 particles

Gang Wang, Kevin Mantey, Munir H. Nayfeh, and Siu-Tung Yau

Appl. Phys. Lett. 89, 243901 (2006); http://dx.doi.org/10.1063/1.2405384 (3 pages) | Cited 8 times

Online Publication Date: 13 December 2006

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The 1 nm Si29 particle is used as the sensing element for an enzyme-free amperometric electrochemical glucose sensor. The sensor shows selective glucose detection against interfering substances at physiological concentrations with long-term stability, reusability, and the absence of electrode poisoning. The Si29 particle is significantly more efficient in generating signal current compared to both dissolved and immobilized enzyme. This observation suggests that the particle can be used to replace enzyme in making glucose sensors and that the particle is a suitable material for the realization of nanoscale devices that generate signals sufficiently high for use.
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82.47.Rs Electrochemical sensors
82.80.Fk Electrochemical methods
87.80.-y Biophysical techniques (research methods)
82.45.Tv Bioelectrochemistry

Frequency domain vibration potential imaging: Objects with symmetry in one dimension

Shougang Wang, Andrew C. Beveridge, Shengqiong Li, Gerald J. Diebold, and Cuong K. Nguyen

Appl. Phys. Lett. 89, 243902 (2006); http://dx.doi.org/10.1063/1.2403933 (3 pages) | Cited 3 times

Online Publication Date: 13 December 2006

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Frequency domain, ultrasonic vibration potential imaging can be carried out by irradiating a colloidal object with a plane ultrasonic wave and recording the magnitude and phase of the current in a pair of electrodes as a function of the frequency. The method is applied to imaging of objects with symmetry in one dimension including a thin layer, a thick layer, pairs of layers, and layers with differing colloidal concentrations. The experimental results show agreement with the theory of vibration potential imaging where the recorded signal is proportional to the integral of the concentration of colloidal or ionic species over the pressure gradient in the ultrasonic wave.
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62.65.+k Acoustical properties of solids
43.60.Lq
82.70.Dd Colloids
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