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Sensors 2013, 13(10), 13917-13927; doi:10.3390/s131013917

An InN/InGaN Quantum Dot Electrochemical Biosensor for Clinical Diagnosis

1,* , 1
1 ISOM Institute for Systems based on Optoelectronics and Microtechnology, ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, Madrid 28040, Spain 2 Department of Science and Technology (ITN), Campus Norrköping, Linköping University, Norrköping 60174, Sweden
* Authors to whom correspondence should be addressed.
Received: 18 July 2013 / Revised: 11 September 2013 / Accepted: 4 October 2013 / Published: 15 October 2013
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2013)
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Low-dimensional InN/InGaN quantum dots (QDs) are demonstrated for realizing highly sensitive and efficient potentiometric biosensors owing to their unique electronic properties. The InN QDs are biochemically functionalized. The fabricated biosensor exhibits high sensitivity of 97 mV/decade with fast output response within two seconds for the detection of cholesterol in the logarithmic concentration range of 1 × 10−6 M to 1 × 10−3 M. The selectivity and reusability of the biosensor are excellent and it shows negligible response to common interferents such as uric acid and ascorbic acid. We also compare the biosensing properties of the InN QDs with those of an InN thin film having the same surface properties, i.e., high density of surface donor states, but different morphology and electronic properties. The sensitivity of the InN QDs-based biosensor is twice that of the InN thin film-based biosensor, the EMF is three times larger, and the response time is five times shorter. A bare InGaN layer does not produce a stable response. Hence, the superior biosensing properties of the InN QDs are governed by their unique surface properties together with the zero-dimensional electronic properties. Altogether, the InN QDs-based biosensor reveals great potential for clinical diagnosis applications.
Keywords: functionalized InN quantum dots; highly sensitive and efficient biosensors; potentiometric; clinical diagnosis functionalized InN quantum dots; highly sensitive and efficient biosensors; potentiometric; clinical diagnosis
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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ul Hassan Alvi, N.; Gómez, V.J.; Soto Rodriguez, P.E.; Kumar, P.; Zaman, S.; Willander, M.; Nötzel, R. An InN/InGaN Quantum Dot Electrochemical Biosensor for Clinical Diagnosis. Sensors 2013, 13, 13917-13927.

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