Preparation of SERS-active substrates based on graphene oxide/silver nanocomposites for rapid zdetection of l-Theanine.
A kind of graphene oxide/silver (GO/Ag) nanocomposites with high Surface enhanced Raman scattering (SERS) activity were fabricated via a facile and green liquid phase reduction method. The synthesized materials were characterized in detail using various microscopic and spectroscopic techniques. In this method, the GO sheets worked as a holder which makes silver nanoparticles (AgNPs) aggregate to a particular morphology, and under a suitable dosage of silver ions, well-dispersed AgNPs on the surface of GO were obtained, which could generate more "hot spots" of SERS. Moreover, SERS technique based on the obtained GO/Ag nanocomposites was used as an effective way to detect l-Theanine. The detection limit was estimated to be as low as 10(-7)M, and a multivariate linear regression model for the concentration of l-Theanine was established. The optimal fitting equation is Y=5.6765+0.0307X1458-0.0267X1251.
College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Key Laboratory of Horticultural Plant Biology, Ministry of Education, 430070 Wuhan, China.
Huajun
H
Zheng
College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Key Laboratory of Horticultural Plant Biology, Ministry of Education, 430070 Wuhan, China.
Dejiang
D
Ni
College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Key Laboratory of Horticultural Plant Biology, Ministry of Education, 430070 Wuhan, China. Electronic address: yuzhi@mail.hzau.edu.cn.
Zhi
Z
Yu
College of Optical and Electronic Technology, China Jiliang University, 310018 Hangzhou, China. Electronic address: plianghust@gmail.com.
Pei
P
Liang
D005971:Glutamates / Q000032:analysis; D006108:Graphite / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D018030:Silver Compounds / Q000737:chemistry; D013059:Spectrum Analysis, Raman / Q000379:methods
D005971:Glutamates; D010087:Oxides; D018030:Silver Compounds; D012834:Silver; D006108:Graphite; C026166:theanine; C040225:disilver oxide
Graphene oxide; SERS; Silver nanoparticles; l-Theanine