Flexible synthesis of high-purity plasmonic assemblies

• 作者: Laurent Lermusiaux Anum Nisar Alison M.Funston
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Research Articles
• 页码范围: 635-645
• 页数: 11页
• 语种: 英文

摘要

The self-assembly of nanoparticles has attracted a vast amount of attention due to the ability of the nanostructure to control light at the sub-wavelength scale,along with consequent strong electromagnetic field enhancement.However,most approaches developed for the formation of discrete assemblies are limited to a single and homogeneous system,and incorporation of larger or asymmetrical nanopartides into assemblies with high purity remains a key challenge.Hera,a simple and versatile approach to assemble nanopartides of different sizes,shapes,and materials into various discrete homo-or hetero-structures using only two complementary deoxyribonucleic acid (DNA) strands is presented.First,surface functionalisation using DNA and alkyl-polyethylene glycol (PEG)enables transformation of as-synthesised nanoparticles into readily usable plasmonic building blocks for self-assembly.Optimlsation of the DNA coverage enables the production of different assembly types,such as homo-and hetero-dimers,trimers and tetramers and core-satellite structures,which are produced in high purity using electrophoresis purification.The approach is extended from purely plasmonic structures to incorporate (luminescent) semiconductor nanopartides for formation of hybrid assemblies.The deposited assemblies form a high yield of specific geometrical arrangements,attributed to the van der Waals attraction between particles.This method will enable the development of new complex colloidal nanoassemblies for biological and optical applications.