Facile Scalable Assembly of Uniform and Layered Plasmonic Hotspots by Force-Assisted Capillary-Mediated Colloidal Transfer.

ABSTRACT: Three-dimensional (3D) assembly of colloidal metal nanoparticles for plasmonic detections has been prepared by Langmuir-Blodgett (LB) deposition. However, due to the small focal volume of an incident light, it suffers from laser spot-to-spot variations in near-field intensities, which undermines signal uniformity, thereby hindering its widespread use. Here, a facile and scalable method to fabricate focal volume-comparable is presented, uniform 3D architectures of plasmonic hotspots by devising the force-assisted, capillary-mediated stacking of colloidal metal nanoparticles. By deploying only a few pN per nanoparticle, it is shown that the method quickly produces multiple monolayers with lateral sizes in the submillimeter range, in which surface uniformity with a small variation of 4% is im

SUBMITTER: La JA 

PROVIDER: S-EPMC12757982 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature