UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles

Abstract

Since the first report in 2007, polydopamine (PDA) coating has shown great potential as a general and versatile method to create functional nanocoatings on arbitrary substrates. Slow kinetics and poor controllability of the coating and secondary modification processes, however, have limited the further development of this attractive method. In this work, it is demonstrated that UV irradiation at 365 nm significantly accelerates the process of secondary modification of a PDA-coated surface. The kinetics of both thiol and amine modifications of PDA are increased 12-fold via UV irradiation, while the kinetics of metal ion reduction at the PDA interface is increased more than 550 times. Moreover, it is demonstrated that irradiating a PDA/metal nanoparticle composite surface with UV light at 254 nm leads to dissolution of the deposited metal nanoparticles (MNPs). Finally, grayscale metallic patterns, dynamic deposition, and removal of MNPs on PDA surface are realized with the proposed method.

In situ growth of TiO2 nanoparticles onto PBO fibers via a mussel‐inspired strategy for enhancing interfacial properties and ultraviolet resistance

“…Moreover, PDA can act as an extremely versatile and robust platform, which provides connectivity for subsequent modification. [28][29][30][31] . Ou et al [32] have successfully deposited continuous TiO 2 coating onto various PDA-modified polymer substrates including polytetrafluoroethyaylene (PTFE), polyethylene (PE), and polyethylene terephthalate (PET), and studied the biocompatibility of resulting materials.…”

Facile preparation of hierarchical porous polydopamine microspheres for rapid removal of chromate from the wastewater

“…Polydopamine-based adsorbents have abundant functional groups, including phenol groups, catechol, carboxy, o-quinone, amino, imine, which have a strong ability to combine with heavy metals and organic pollutants via chelation, π-π stacking interactions, electrostatic interaction, hydrogen bonding [30]. Moreover, PDA possesses strong reduction ability and has proved effective in reducing some metal ions such as Pt 3+ , Au 3+ and Ag + and graphene oxides [31,32]. Recently, PDA-based functional materials are a kind of adsorbents that have attracted much attention for Cr(VI) removal [25,26,[33][34][35].…”

Strategic Advances in Spatiotemporal Control of Bioinspired Phenolic Chemistries in Materials Science

“…[231] Very recently, rapidly formed, dynamic, erasable micropatterns have been achieved, through wavelength-selective UVtriggered secondary modification of PDA. [232] The authors demonstrated that 365 nm UV irradiation remarkably increased the kinetics of Michael-addition (or Schiff base reaction) by 12 folds. In addition, the metallization kinetics was accelerated by more than 550 times ( Figure 12B, e).…”