| 학회 | 한국재료학회 |
| 학술대회 | 2019년 가을 (10/30 ~ 11/01, 삼척 쏠비치 호텔&리조트) |
| 권호 | 25권 2호 |
| 발표분야 | B. 나노화학/바이오 재료 분과 |
| 제목 | Stepwise Synthesis of High Purity Chiral Plasmonic Gold Nanoparticles |
| 초록 | Chiral plasmonic nanoparticle draws numerous attentions with the potential realization of chiral sensing, negative refractive index, and polarization control. Fabrication of chiral plasmonic structure often requires a delicate yet complicated process such as lithographic techniques and molecular self-assembled template method. Recently, based on a well-known seed-mediated method, the more facile approach using chiral amino acid and peptide as a chirality inducer has been introduced.1 In this system, the growth solution contains Cetyltrimethylammonium bromide (CTAB) as a ligand, ascorbic acid(AA) as a reducing agent, and thiol-containing biomolecules such as cysteine and glutathione as chirality inducer. Within this system, the interaction between peptides and gold surface induce each nanoparticle to expose high miller index facet and to show prominent optical activity with a dissymmetry factor of 0.2 at the visible range has been demonstrated. In this study, by extending previously learned lessons about peptide-induced chiral nanoparticle synthesis, we highlight two major perspectives of achieving greater chirality during chiral gold nanoparticle synthesis: growth-kinetic control and uniformity-control. To obtain the significant chiroptic response, the development of a highly curved chiral cavity and uniformity of the synthesized nanoparticles are equally important.2 However, achieving high uniformity of synthesized nanoparticles conventionally requires low reduction kinetics during the growth step which simultaneously hampers the generation of chiral cavity formation. Thereby, we proposed a multi-step chiral nanoparticle synthesis step while retaining two correlated optimal ratios; gold precursor vs chiral peptide and reducing agent (Ascorbic Acid) vs CTAB surfactant. Our procedure minimizes the irregularity of synthesized chiral morphology by applying lower growth kinetics while retaining its chiral motif structures. Our study provides a well-controlled and highly uniform synthesis system for the generation of chiral nanoparticle which could potentially be applied for chiral metamaterial synthesis. 1. Nature,2018,556,360–365 2. ACS Nano,2019,13,8,8659-8668 |
| 저자 | 변기현, 조남헌, 남기태 |
| 소속 | 서울대 |
| 키워드 | <P>Chirality; Chiral nanoparticle; Nanoparticle synthesis; Seed-mediated synthesis</P> |
