Abstract
The largest possible planar surfaces are highly sought for two-dimensional (2D) Au single-crystals applicable in catalysis, biomedicine, electronics, sensing, and optics. However, conventional chemical methods of synthesis are currently limited to planar area of 104 μm2. Here, the trans-scale and 2D growth of Au single-crystals is successfully achieved in a “kinetically controlled” pathway, taking advantage from natural fibrous proteins with different amino sequences and supramolecular architectures. It was found that silk fibroin (SF) has a uniquely suited amino sequence and supramolecular assembly ability to fulfill this task, enabling mild reducing ability and strong capping effects. By the synergetic aid of Cl– ions, 2D Au single-crystals were synthesized with an unprecedented lateral dimension exceeding 2 mm, yet with atomically smooth surfaces. When growing nanotips on their large planar surfaces, these 2D Au crystals stand as ideal platforms for single-molecule sensing (e.g., surface enhanced Raman...
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