Reactant for: Preparation of orthogonally dual-clickable Janus nanoparticles via cyclic templating strategy Preparation of cyclic RGD functionalized gold nanoparticles for tumor targeting Asymmetric-functionalized nanoparticle with orthogonal clickable functionalities Functional immobilization of small GTPase Rab6A on DNA-gold nanoparticles by using a site-specifically attached poly(ethylene glycol) linker and thiol-place exchange reaction Direct writing of metal nanoparticle films inside sealed microfluidic channels in relation to biofunctionalization with ligands for protein capture and fluorescence assay