Use of the interparticle i-motif for the controlled assembly of gold nanoparticles.
作者： Wenxing Wang , Huajie Liu , Dongsheng Liu , Yun Xu , Yang
DOI: 10.1021/LA702273A
关键词: Nanostructure 、 Color changes 、 Chemical engineering 、 Nanotechnology 、 Transition metal 、 Nanoparticle 、 Naked eye 、 Colloidal gold 、 Materials science 、 Metal nanoparticles
摘要: In this letter, we present a new design that uses single-stranded (ss) DNAs containing two stretches of cytosine (C)-rich domains for the controlled assembly gold nanoparticles (Au NPs). We show is driven by formation interparticle i-motif (four-stranded C-quadruplex) structures formed between C-rich ssDNAs on neighboring Au NPs. The happens only at slightly acidic pH conditions (pHs below pKa i-motif). reversible and can be switched changing solution pH. disassembly process accompanied distinct color changes are clearly visible to naked eye. This development may have applications in pH-sensitive nanostructures and/or devices.
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