Nano Archive

Silicon nanowires-based huorescence sensor for Cu(II)

Mu, Lixuan and Shi, Wensheng and Chang, Jack C. and Lee, Shuit-Tong (2008) Silicon nanowires-based huorescence sensor for Cu(II). NANO LETTERS, 8 (1). pp. 104-109.

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Si nanowires (SiNWs) were covalently modified by fluorescence ligand, N-(quinoline-8-yl)-2-(3-triethoxysilyi-propylamino)-acetamide (QIOEt) and finally formed an optical sensor to realize a highly sensitive and selective detection for Cu(II). The QIOEt-modified SiNWs sensor has sensitivity for Cu(II) down to 10(-8) M, which is more sensitive than QIOEt alone. Metal ions interferences have no observable effect on the sensitivity and selectivity of OlOEt-modified SiNWs sensor. The SiNWs-based fluorescence sensor is reversible by addition of acid to replace Cu(II). The sensing mechanisms of QIOEt-modified SiNWs to Cu(II) and the rationale for the increase in sensitivity and selectivity of QIOEt-modified SiNWs over QIOEt on Cu(II) are discussed. The current sensor structure may be extendable to other chemo- and biosensors, and even to nanosensors for direct detection of specific materials in intracellular environment.

Item Type:Article
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:1165
Deposited By:Anuj Seth
Deposited On:16 Dec 2008 17:01
Last Modified:19 Jan 2009 13:36

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