材料科学
纳米孔
制作
纳米技术
纳米材料
单层
纳米颗粒
电催化剂
多孔性
化学工程
电化学
电极
复合材料
医学
化学
替代医学
病理
物理化学
工程类
作者
Moxia Li,Yaomengli Xu,Bingwu Liu,Jianfang Liu,Xuguang Sun,Dongmei Deng,Xidong Duan,Jiawen Hu
标识
DOI:10.1007/s40843-022-2020-9
摘要
Three-dimensional (3D) nanoporous gold (NPG) shows promising applications in various fields. However, its most common fabrication strategy (i.e., dealloying) faces the problems of high energy consumption, resource waste, the use of corrosive solvent, and residue of the sacrificial component. Here, we report a general bottom-up nanowelding strategy to fabricate high-purity NPG from Au nanoparticles (NPs), accomplished via interfacial self-assembly of the Au NPs into monolayer Au NP film, its subsequent layer-by-layer transfer onto a solid substrate, and direct current (DC) nanowelding. We show that the DC nanowelding process can gradually evolve the layered Au NP film into NPG at low temperatures within 10 s, while not damaging their spherical structure. This is because during the nanowelding, electrons are preferred to be localized at the high-resistance NP/NP junctions, whose electrostatic repulsion in turn strengthens their surface atom diffusion to initiate a mild solid-state diffusion nanowelding. Furthermore, when using differently sized Au NPs as the starting building blocks, this strategy allows readily tuning the thickness, ligament size, and pore size, thereby offering great flexibility to create functional porous nanomaterials, e.g., electrocatalyst for methanol electrooxidation. Surely, low-temperature nanowelding can play a role for the production of diverse nanoporous materials from other NPs beyond Au NPs.
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