2 research outputs found
Interpenetrated Binary Supramolecular Nanofibers for Sensitive Fluorescence Detection of Six Classes of Explosives
In this work, we
develop a sequential self-assembly approach to
fabricate interpenetrated binary supramolecular nanofibers consisting
of carbazole oligomer <b>1</b>–cobaltÂ(II) (<b>1</b>-Co<sup>2+</sup>) coordination nanofibers and oligomer <b>2</b> nanofibers for the sensitive detection of six classes of explosives.
When exposed to peroxide explosives (e.g., H<sub>2</sub>O<sub>2</sub>), Co<sup>2+</sup> in <b>1</b>-Co<sup>2+</sup> coordination
nanofibers can be reduced to Co<sup>+</sup> that can transfer an electron
to the excited <b>2</b> nanofibers and thereby quench their
fluorescence. On the other hand, when exposed to the other five classes
of explosives, the excited <b>2</b> nanofibers can transfer
an electron to explosives to quench their fluorescence. On the basis
of the distinct fluorescence quenching mechanisms, six classes of
explosives can be sensitively detected. Herein, we provide a new strategy
to design broad-band fluorescence sensors for a rich identification
of threats
Discrimination of Five Classes of Explosives by a Fluorescence Array Sensor Composed of Two Tricarbazole-Nanostructures
In
this work, we report a two-member fluorescence array sensor
for the effective discrimination of five classes of explosives. This
smallest array sensor is composed of tricarbazole-based nanofibers
(sensor member <b>1</b>) and nanoribbons (sensor member <b>2</b>) deposited as two film bands in a quartz tube. On the basis
of a simple comparison of the resulting fluorescence quenching ratios
between two sensor members and the response reversibility upon exposure
to vaporized explosives, five classes of explosives can be sensitively
detected and easily discriminated. This array sensor that has only
two sensor members and no complex data analysis represents a new design
way for discrimination of a broad class of explosives