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6 Apr 2009

Volume 94, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 94, 141901 (2009); http://dx.doi.org/10.1063/1.3111813 (3 pages)

G. S. Huang (黄高山), S. Kiravittaya, V. A. Bolaños Quiñones, F. Ding (丁飞), M. Benyoucef, A. Rastelli, Y. F. Mei (梅永丰), and O. G. Schmidt
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Nanostructured zinc oxide platform for cholesterol sensor

Pratima R. Solanki, Ajeet Kaushik, Anees A. Ansari, and B. D. Malhotra

Appl. Phys. Lett. 94, 143901 (2009); http://dx.doi.org/10.1063/1.3111429 (3 pages) | Cited 19 times

Online Publication Date: 8 April 2009

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Nanostructured zinc oxide (nano-ZnO) film has been fabricated onto indium tin oxide (ITO) containing preferred (002) plane and 10 nm crystallite size using sol-gel technique for immobilization of cholesterol oxidase (ChOx). Electrochemical response of ChOx/nano-ZnO/ITO bioelectrode determined as a function of cholesterol concentration using cyclic voltammetry technique reveals improved detection range (5–400 mg/dl), low detection limit (0.5 mg/dl), fast response time (10 s), sensitivity (0.059 μA/mg dl−1 cm−2), and low value (0.98 mg/dl) of Michaelis–Menten constant (Km). It is shown that nano-ZnO film provides better environment and enhanced electron transfer between ChOx and electrode.
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87.85.Rs Nanotechnologies-applications
81.16.-c Methods of micro- and nanofabrication and processing
82.47.Rs Electrochemical sensors
82.80.Fk Electrochemical methods
82.45.Fk Electrodes
87.15.ht Ultrafast dynamics; charge transfer

DNA-quantum dot sensing platform with combined Förster resonance energy transfer and photovoltaic effect

Huijie Qi, Lixiang Wang, Ka-wai Wong, and Zuliang Du

Appl. Phys. Lett. 94, 143902 (2009); http://dx.doi.org/10.1063/1.3117193 (3 pages)

Online Publication Date: 10 April 2009

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A special DNA sensing platform based on a network of hybrid DNA-quantum dot system was designed and fabricated. Upon attachment of hybridized complementary DNA sequences, the molecular switch system can exhibit both photoinduced Förster resonance energy transfer (FRET) and photovoltaic (PV) effects simultaneously, but will give much weakened or no effect for the capture of hybridized products from “mismatched” DNA sequences. This dual sensing scheme based on combined FRET and PV effects can safeguard the accuracy of sensing, as FRET and PV can be singly induced even in the case of mismatch.
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87.85.jc Electrical, thermal, and mechanical properties of biological matter
87.15.Pc Electronic and electrical properties
85.65.+h Molecular electronic devices
87.15.Qt Sequence analysis
87.14.gk DNA
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