Nano Archive

Poly(styrene-block-vinylpyrrolidone) beads as a versatile material for simple fabrication of optical nanosensors

Borisov, Sergey M. and Mayr, Torsten and Klimant, Ingo (2008) Poly(styrene-block-vinylpyrrolidone) beads as a versatile material for simple fabrication of optical nanosensors. ANALYTICAL CHEMISTRY, 80 (3). pp. 573-582.

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Official URL: http://dx.doi.org/10.1021/ac071374e

Abstract

A versatile platform for designing optical nanosensors, is proposed. The ``sensing chemistries'' are entrapped into the poly(styrene-block-vinylpyrrolidone) nanoheads having the average size of 245 run in aqueous media. Addressable staining into the core or the shell of the beads results in nanosensors for essential analytes such as dissolved oxygen, temperature, pH, chloride, and copper ions. Two immobilization procedures are developed: staining in the polystyrene core is performed from a tetrahydrofuran/water mixture (50:50 v/v) and staining in the poly(vinylpyrrolidone) shell is achieved by using the ethanol/water mixture (70:30 v/v). The oxygen and temperature indicators should be preferably immobilized into the core, whereas nanosensors for ions are manufactured by staining into the shell. In the case of the lipophilic pH indicators both procedures result in similar pK(a) values. The unique properties of the beads make them promising for sensing and imaging even in very complex media, multianalyte sensing, and monitoring of very fast processes.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Analytical Science > Nanotechnology for sensing and actuating
Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:1180
Deposited By:Anuj Seth
Deposited On:16 Dec 2008 15:41
Last Modified:19 Jan 2009 12:21

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