フジタ　タカシ   藤田　隆史    所属   工学部 応用化学科    職種   助教
言語種別	英語
発行・発表の年月	2022/11
形態種別	学術論文
査読	査読あり
標題	Formation and Characterization of 2D Closely Packed Arrays of Bare Gold Nanoparticles without Aggregation
執筆形態	共著
掲載誌名	ACS Omega
掲載区分	国外
出版社・発行元	ACS Publications
担当区分	筆頭著者
著者・共著者	Takashi Fujita, Kohei Shibamoto
概要	Uniform 2D arrays of metal nanoparticles (NPs) have received significant attention in the field of molecular sensing using localized surface plasmon resonance. Generally, metal NPs bear organic surface-modifying molecules to prevent aggregation and form 2D metal NP arrays. However, surface-modifying molecules negatively affect molecular sensing. Previously, we developed a technique for forming a 2D bare metal NP array, denoted the sandwich (SW) technique. However, the formation mechanism of these 2D metal NP arrays remains unknown and therefore the experimental conditions of the SW technique are not optimized. Here, we observed the formation of a 2D Au NP (d: 60 nm) array using the SW technique with an optical microscope. Moderate drying conditions of the colloidal droplets sandwiched between two parallel substrates were necessary for forming 2D Au NP arrays. We then optimized the drying conditions and obtained a 2D Au NP array. This array was uniform, and the Au NPs were arranged at distances of 4.5 nm with hexagonal periodicity, without aggregation. Further, the 2D Au NP arrays exhibited excellent spot-to-spot reproducibility in surface-enhanced Raman scattering.
外部リンクURL	https://doi.org/10.1021/acsomega.2c04032