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Nanoscale

A new peer reviewed journal publishing experimental and theoretical work across the breadth of nanoscience and nanotechnology



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Paper

Nanoscale, 2009, 1, 128 - 132, DOI: 10.1039/b9nr00019d

Synthesis of highly luminescent cobalt(II)-bis(8-hydroxyquinoline) nanosheets as isomeric aromatic amine probes

Haibing Li and Yuling Li

Highly luminescent and water-soluble cobalt(II)-bis(8-hydroxyquinoline) (CoQ2) nanosheets have been successfully synthesized via a simple, rapid sonochemical method. The water-soluble CoQ2 nanosheets were characterized by luminescence spectroscopy, UV–vis spectroscopy, FT-IR spectroscopy and transmission electron microscopy (TEM). The CoQ2 nanosheets allow highly sensitive and selective determination of p-nitroaniline via fluorescence quenching. Under optimal conditions, the relative fluorescence intensities of nanosheets decreased linearly with increasing p-nitroaniline. However, the sensitivity of CoQ2 nanosheets toward other aromatic amines including o-diaminobenzene, m-diaminobenzene, p-diaminobenzene, p-toluidine, o-nitroaniline, m-nitroaniline, p-chloroaniline and aniline is negligible. It is found that p-nitroaniline can quench the luminescence of CoQ2 nanosheets in a concentration-dependent manner that is best described by a Stern–Volmer-type equation. The possible underlying mechanism is discussed.

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