Halide Ions Sensing in Water via Silver Nanoprism Self-Assembled Chips
A silver nanoprism self-assembled monolayer was constructed, and as a novel nanosensing chip, it was applied for the determination of halide ions in water, including Cl–, Br– and I–. The sensing mechanism was based on different reaction
rates in the shape-conversion processes of silver nanoprisms to nanodisks when they encountered halide ions with different concentrations. The extinction spectra of silver nanoprisms were in situ recorded in the sculpture processes. The shape conversion reaction rate, represented by
the decreasing inplane dipole band intensity of silver nanoplates versus the reaction time (dI/dt), was calculated, displaying a Logistic relationship with the concentrations of halide ions. The lowest detection concentrations were 300, 3.0 and 3.0 M (equal to 10.63, 0.24 and
0.38 mg/L) for Cl–, Br– and I–, respectively. The interference experiments were carried out and the results showed that most anions involving F–, PO3–
4, HPO2–
4, H2PO–
4,
SO2–
3, and SO2–
4 had no effect on the shape transformation of silver nanoprisms, except S2O2–
3 and S2– presenting minor effect when their concentrations were fifteen times of those
of the analytes. This new nanosensing film has fast response to halide ions and the advantage of convenient transportation and storage, which is applicable to halide ions detections in water.
Keywords: NANOSENSOR; REACTION RATE; SHAPE CONVERSION; SILVER NANOPARTICLE; WATER QUALITY
Document Type: Research Article
Publication date: 01 August 2013
- Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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