title: Dendrimer-Capped Gold Nanoparticles for Highly Reliable and Robust Surface Enhanced Raman Scattering.
abstract: Dendrimer-stabilized gold nanoparticles (Au-Den) were prepared by a facile solution based method for a highly reliable and robust surface enhanced Raman scattering (SERS) substrate. Au-Den was selectively attached on the surface of reduced graphene oxide (rGO) by noncovalent interactions between the Au capping dendrimer and the graphene surface. Au-Den/rGO exhibits the outstandingly stable and highly magnified Raman signal with an enhancement factor (EF) of 3.9 × 10(7) that enables detection of R6G dyes with concentration as low as 10 nM, retaining 95% of the Raman signal intensity after 1 year. The remarkable stability and enhancement originated not only from a simple combination of the electromagnetic and chemical mechanism of SERS but also from intensified packing density of stable Au-Den on the graphene substrate due to the firm binding between the dendrimer capped metal nanoparticles and the graphene substrate. This method is not limited to the gold nanoparticles and G4 dendrimer used herein, but also can be applied to other dendrimers and metal nanoparticles, which makes the material platform suggested here superior to other SERS substrates.
authors.affiliation: Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.|School of Energy and Chemical Engineering, UNIST , Ulsan 44919, Republic of Korea.
authors.forename: Kwanghyun
authors.initials: K
authors.lastname: Kim
authors.affiliation: Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.|School of Energy and Chemical Engineering, UNIST , Ulsan 44919, Republic of Korea.
authors.forename: Jeongyeop
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Chemistry, KAIST , 291 Daehak-ro, Yuseong-gu, Daejeon 34142, Republic of Korea.
authors.forename: Gyeongcheon
authors.initials: G
authors.lastname: Jo
authors.affiliation: Department of Chemistry, KAIST , 291 Daehak-ro, Yuseong-gu, Daejeon 34142, Republic of Korea.
authors.forename: Seungmin
authors.initials: S
authors.lastname: Shin
authors.affiliation: Department of Chemistry, KAIST , 291 Daehak-ro, Yuseong-gu, Daejeon 34142, Republic of Korea.
authors.forename: Jin-Baek
authors.initials: JB
authors.lastname: Kim
authors.affiliation: Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.|School of Energy and Chemical Engineering, UNIST , Ulsan 44919, Republic of Korea.
authors.forename: Ji-Hyun
authors.initials: JH
authors.lastname: Jang
keywords: GERS; SERS; dendrimer (PAMAM-G4); gold nanoparticle; reduced graphene oxide; stability