119th General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Material Chemists
Room No. 402호
Time THU 10:40-:
Code MAT.O-11
Subject Tailoring the size of Au nanoparticle clusters through sacrificial template assembly method for investigation of size effects in optimal SERS performance
Authors 이승훈, 한상우*
KAIST 화학과, Korea
Abstract The assembly nanostructures offer many advantages for enhanced plasmonic performance through a precise control over both the gap size and the particle size. Although the many assembly strategies have been reported in colloidal solution, there are some issues with structural stability and facile synthesis method due to their assembly forces sensitive to environmental stimuli. Here, we manipulate the size of constituent particle in nanoparticle clusters (NPCs) easily through a sacrificial template mediated assembly strategy. Due to the intrinsic assembly force of our assembly strategy such as Van der Waals force and capping agent interaction, the prepared Au NPCs demonstrate remarkable structural stability and SERS performance even in harsh conditions such as strong acidic (pH 2) or basic (pH 12) condition. Furthermore, the new tendency of size effect in SERS is observed that the smaller particle size demonstrates the strong SERS performance than the larger particle size in well-defined assembly structures. Finite-difference time-domain (FDTD) calculations support our results through induction of the competition between the intensity of hot spot and the area of hot spot.
E-mail soenghoon@kaist.ac.kr