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Gold Triangular Nanoplates Based Single-Particle Dark-Field Microscopy Assay of Pyrophosphate
journal contribution
posted on 2019-12-03, 15:22 authored by Xiao Ying Gu, Jia Jun Liu, Peng Fei Gao, Yuan Fang Li, Cheng Zhi HuangOwing to the sharp edge-enhanced electric field, gold
triangular
nanoplates (AuNPLs) exhibit strong localized surface plasmon resonance
(LSPR) scattering and display as red spots with high intensity and
narrow distribution under dark-field microscopy (DFM), based on which
sensitive sensing applications could be developed. As a concept of
proof, the inhibition effects of pyrophosphate (PPi) against the etching
of AuNPLs based on Cu2+ and I– mediated
is dynamically monitored. The etching proceeding of AuNPLs by copper
ions and iodide ions leads to the gradually blue-shifted LSPR scattering
color of AuNPLs under DFM from the original red to green, accompanied
by the reduced LSPR scattering intensity. As a result of the strong
affinity of PPi to copper ions, the presence of PPi makes the etching
process greatly suppressed, thereby achieving sensitive detection
of the PPi.