Nano Archive

Optical nanoscale pool-on-surface design for control sensing recognition of multiple cations

El-Safty, Sherif A. and Ismail, Adel A. and Matsunaga, Hideyuki and Hanaoka, Takaaki and Mizukami, Fujio (2008) Optical nanoscale pool-on-surface design for control sensing recognition of multiple cations. ADVANCED FUNCTIONAL MATERIALS, 18 (10). pp. 1485-1500.

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General design of optical chemical nanosensors is needed to develop efficient sensing systems with high flexibility, and low capital cost for control recognition of toxic analytes. Here, we designed optical chemical nanosensors for simple, high-speed detection of multiple toxic metal ions. The systematic design of the nanosensors was based on densely patterned chromophores with intrinsic mobility, namely, ``building-blocks'' onto three-dimensional (3D) nanoscale structures. The ability to precisely modify the nanoscale pore surfaces by using a broad range of chromophores that have different molecular sizes and characteristics enables detection of multiple toxic ions. A key feature of this building-blocks design strategy is that the surface functionality and good adsorption characteristics of the fabricated nanosensor arrays enabled the development of ``pool-on-surface'' sensing systems in which high flux of the metal analytes across the probe molecules was achieved without significant kinetic hindrance. Such a sensing design enabled sensitive recognition of metal ions up to sub-picomolar detection limits (similar to 10(-11) mol dm(-3)), for first time, with rapid response time within few seconds. Moreover, because these sensing pools exhibited long-term stability, reversibility and selectivity in detecting most pollutant cations, for example, Cr(VI), Pb(II), Co(II), and Pd(II) ions, they are practical and inexpensive. The key result in our study is that the pool-on-surface design for optical nanosensors exhibited significant ion-selective ability of these target ions from environmental samples and waste disposals.

Item Type:Article
Subjects:Technology > Nanotechnology and environmental applications
Analytical Science > Nanotechnology for sensing and actuating
Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:1161
Deposited By:Anuj Seth
Deposited On:17 Dec 2008 10:11
Last Modified:19 Jan 2009 13:39

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