Showing papers by "Bianhua Liu published in 2012"
TL;DR: The shell thickness-dependent Raman enhancement of silver-coated gold nanoparticles (Au@Ag NPs) for the identification and detection of pesticide residues at various fruit peels is reported.
Abstract: Here, we report the shell thickness-dependent Raman enhancement of silver-coated gold nanoparticles (Au@Ag NPs) for the identification and detection of pesticide residues at various fruit peels. The Raman enhancement of Au@Ag NPs to a large family of sulfur-containing pesticides is ∼2 orders of magnitude stronger than those of bare Au and Ag NPs, and there is a strong dependence of the Raman enhancement on the Ag shell thickness. It has been shown for the first time that the huge Raman enhancement is contributed by individual Au@Ag NPs rather than aggregated Au@Ag NPs with “hot spots” among the neighboring NPs. Therefore, the Au@Ag NPs with excellent individual-particle enhancement can be exploited as stand-alone-particle Raman amplifiers for the surface identification and detection of pesticide residues at various peels of fruits, such as apple, grape, mango, pear, and peach. By casting the particle sensors onto fruit peels, several types of pesticide residues (e.g., thiocarbamate and organophosphorous c...
370 citations
TL;DR: A combinational logic gate based on fluorescent graphene oxide has been reported to discriminate Fe(3+), Fe(2+) and their mixture in living cells by fluorescence imaging.
131 citations
TL;DR: Novel SERS nanotags with highly uniform and reproducible signals have been developed by the layer-by-layer assembly and crosslinkage of small silver nanoparticles at the surface of silica particles, which opens an avenue to the quantitative and reliable SERS application in bioassays.
48 citations