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Water-dispersed silicon quantum dots (SiQDs) with the quantum yield of 25% was prepared using aminopropyltrimethoxysilane as the silicon source and ascorbic acid (AA) as the reduction reagent. The SiQDs display blue fluorescence with excitation/emission peaks at 350 nm/440 nm. The synthesized SiQDs are shown to be a viable “on-off-on” fluorescent probe for the detection of Cr(VI) and AA. Cr(VI) ions...
A surface-enhanced Raman scattering (SERS) substrate with good flexibility and high water absorbing capacity is reported. It consists of a calcium alginate sponge incorporating gold nanoparticles. These are in close contact with the sponge without the need for amino or sulfhydryl modification. The substrate is capable of detecting the dyes crystal violet (CV) and malachite green (MG) in water directly...
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