Room‐Temperature Annealing‐Free Gold Printing via Anion‐Assisted Photochemical Deposition. Issue 32 (1st July 2022)

• Record Type: Journal Article
• Authors: Wu, Dong; Yao, Bowen; Wu, Shuwang; Hingorani, Hardik; Cui, Qingyu; Hua, Mutian; Frenkel, Imri; Du, Yingjie; Hsiai, Tzung K.; He, Ximin
• Is Part Of: Advanced materials. Volume 34:Issue 32(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-01
• Subjects: conformable electrodes -- gold patterning -- photoreduction -- projection lithography -- specific ion effects; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202201772
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Metal patterning via additive manufacturing has been phasing‐in to broad applications in many medical, electronics, aerospace, and automotive industries. While previous efforts have produced various promising metal‐patterning strategies, their complexity and high cost have limited their practical application in rapid production and prototyping. Herein, a one‐step gold printing technique based on anion‐assisted photochemical deposition (APD), which can directly print highly conductive gold patterns (1.08 × 10 7 S m −1 ) under ambient conditions without post‐annealing treatment, is introduced. Uniquely, the APD uses specific ion effects with projection lithography to pattern Au nanoparticles and simultaneously sinter them into tunable porous gold structures. The significant influence of kosmotropic or chaotropic anions in the precursor ink on tuning the morphologies and conductivities of the printed patterns by employing a series of different ions, including Cl − ions, in the printing process is presented. Additionally, the resistance stabilities and the electrochemical properties of the APD‐printed gold patterns are carefully investigated. The high conductivity and excellent conformability of the printed Au electrodes are demonstrated with reliable performance in electrophysiological signal delivery and acquisition for biomedical applications. This work exploits the potential of photochemical‐deposition‐based metal patterning in flexible electronic manufacturing. Abstract : A facile anion‐assisted photochemical deposition‐based gold patterning method, which can direct print highly conductive gold patterns (1.08 × 10 7 S m −1 ) under ambient conditions without post annealing is presented. The technique combines Digital Light Processing‐based projection lithography with specific ion effects. The high conductivity and excellent conformability of the printed Au is demonstrated, with reliable performance in electrophysiological signal transductions.