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Asymmetric Core–Shell Gold Nanoparticles and Controllable Assemblies for SERS Ratiometric Detection of MicroRNA
Author(s) -
Zhu Rong,
Feng Hongjuan,
Li Qingqing,
Su Lichao,
Fu Qinrui,
Li Juan,
Song Jibin,
Yang Huanghao
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202102893
Subject(s) - shell (structure) , plasmon , nanoparticle , nanostructure , nanotechnology , molecule , materials science , colloidal gold , janus , polymer , amphiphile , raman spectroscopy , chemistry , optoelectronics , copolymer , optics , composite material , physics , organic chemistry
Janus nanogap gold nanoparticles (JAuNNPs) with varying proportions of Au shell coverage of (ca. 100/75/50/25 %) are presented. The internal nanogap between the partial Au shell and core caused asymmetric optical behavior; tunability depends on the degree of Au shell coverage and structural asymmetry. The shell‐to‐shell or core‐to‐core JAuNNDs(50 %) were self‐assembled from amphiphilic JAuNNPs(50 %) by tuning the hydrophilic and hydrophobic polymer brushes on the Au core or shell. The positions of electromagnetic field enhancement of JAuNNDs varied with geometrical configurations because of hybridized plasmonic coupling effects. Furthermore, DNA linkers were utilized to form JAuNND 12 (50 %). By combining with Raman molecules, ratiometric SERS signals could be generated, enabling JAuNND 12 (50 %) to image the distribution of miR‐21 in living cells and tumors. Asymmetric JAuNNPs allowed facile conjugation of various linkage molecules to fabricate dimeric nanostructures.