UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles. (24th May 2019)

• Record Type: Journal Article
• Authors: Zeng, Yi; Du, Xin; Hou, Wei; Liu, Xiaojiang; Zhu, Cun; Gao, Bingbing; Sun, Liangdong; Li, Qiwei; Liao, Junlong; Levkin, Pavel A.; Gu, Zhongze
• Is Part Of: Advanced functional materials. Volume 29:Number 34(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-05-24
• Subjects: patterning -- polydopamine -- secondary modification -- surface metallization -- UV trigger; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201901875
• Languages: English
• ISSNs: 1616-301X

Abstract

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. Abstract : Reversible deposition and removal of metal nanoparticles on a polydopamine surface is reported. With the help of UV, the reduction of metal ions is accelerated by more than 550 times, and the kinetics of the modification by thiols and amines is increased ≈12 times. The high efficiency, light‐controllability, and reversibility make the secondary modification on polydopamine much more flexible.