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Issue 23, 2012
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A single fluorescent self-assembled monolayer film sensor with discriminatory power

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Abstract

A fluorescent self-assembled monolayer film sensor with discriminatory power was specially designed and prepared by using pyrene as a reporting unit and a oligo(oxyethylene) unit as a hydrophilic spacer. The chemical attachment of pyrene moieties on the surface was verified by contact angle, XPS, UV-vis and fluorescence measurements. The fluorescence responses of the present film to nitroaromatic compounds (NACs) including picric acid, 2,4,6-trinitrotoluene, 2,4-dinitrotoluene, and nitrobenzene were measured. Significantly, the present film exhibits cross-reactive responses to different NACs, and the array of fluorescence variation at four specific wavelengths (peaks for pyrene's monomer emission and excimer emission) provides a distinct recognition pattern for each NAC. The results from principle component analysis reveal that the present film has discriminatory power to identify structurally similar NACs. Moreover, the present film exhibits a high sensitivity, selectivity and reversibility towards NACs, and provides great potential in instrumentation and miniaturization. The use of multiple signals of a single film sensor based on fluorophore's different aggregation states (e.g., pyrene's monomer, distorted excimer, and perfect excimer in the present work) instead of an array of sensor elements provides a novel strategy for developing discriminatory materials and remarkably simplifies the process of identifying similar chemicals.

Graphical abstract: A single fluorescent self-assembled monolayer film sensor with discriminatory power

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Publication details

The article was received on 06 Feb 2012, accepted on 30 Mar 2012 and first published on 03 Apr 2012


Article type: Paper
DOI: 10.1039/C2JM30697B
Citation: J. Mater. Chem., 2012,22, 11574-11582
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    A single fluorescent self-assembled monolayer film sensor with discriminatory power

    L. Ding, Y. Liu, Y. Cao, L. Wang, Y. Xin and Y. Fang, J. Mater. Chem., 2012, 22, 11574
    DOI: 10.1039/C2JM30697B

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