A simple gold nanoplasmonic SERS method for trace Hg2+ based on aptamer‐regulating graphene oxide catalysis |
| |
| Authors: | Chongning Li Xiaoliang Wang Aihui Liang Yanghe Luo Guiqing Wen Zhiliang Jiang |
| |
| Affiliation: | 1. Ministry of Education, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Guilin, China;2. School of Food and Bioengineering, Hezhou University, Hezhou, China |
| |
| Abstract: | The as‐prepared graphene oxide (GO) exhibited a strong catalytic effect on reduction of HAuCl4 by trisodium citrate to form gold nanoplasmons (AuNPs) with a strong surface‐enhanced Raman scattering (SERS) effect at 1615 cm?1 in the presence of molecular probe Victoria blue 4R (VB4r). SERS intensity increased with nanocatalyst GO concentration due to the formation of more AuNP substrates. The aptamer (Apt) of Hg2+ can bind to GO to form Apt–GO complexes, which can strongly inhibit nanocatalysis. When target Hg2+ is present, the formed stable Hg2+–Apt complexes are separated from the GO surface, which leads to GO catalysis recovery. The enhanced SERS signal was linear to Hg2+ concentration in the range 0.25–10 nmol/L, with a detection limit of 0.08 nmol/L Hg2+. Thus, a new gold nanoplasmon molecular spectral analysis platform was established for detecting Hg2+, based on Apt regulation of GO nanocatalysis. |
| |
| Keywords: | aptamer regulation gold nanoreaction graphene oxide catalysis Hg (II) SERS |
|
|
