LAUSR

Three-dimensional (3D) ordered construction of nanoparticles has attracted much attention in wide applications, however, techniques with respect to cost-effective nanofabrication of well-defined functional architectures is still lacking. To address this specific issue, a bio-interface confinement approach is proposed that precisely replicates the complex cellular structural features of microbe and integrate silver nanoparticle building block into their 3D framework in a precise, low-cost and mass production way. Herein, the silver NPs with nanospheres and nanosheets structure were synthesized by way of electroless deposition using Spirulina as template. Results showed that silver NPs were orderly assembled along the cellular structure, and the spatially confinement of cellular texture induced the transformation of silver NPs from sphere to flake morphology during their continuous growth. The silver assembly not only show good antibacterial activity, but also exhibit excellent surface-enhanced Raman scattering (SERS) performance with the enhancement factor as high as 5.95×108 and good recuperability towards Rhodamine 6G. The fascinating SERS performance can be ascribed to the combined action of nanosheets morphology of silver NPs, hierarchical nanostructure of the cellular structure, and the small interparticle spacing. This strategy provides an effective strategy for controllable and ordered 3D assembly of NPs by using the cellular texture.