Probing Multidimensional Structural Information of Single Molecules Transporting through a Sub-10 nm Conical Plasmonic Nanopore by SERS.
Juan ZhouPan-Ling ZhouQi ShenSaud Asif AhmedXiao-Tong PanHai-Ling LiuXin-Lei DingJian LiKang WangXing-Hua XiaPublished in: Analytical chemistry (2021)
Probing the orientation and oxygenation state of single molecules (SMs) is of great importance for understanding the advanced structure of individual molecules. Here, we manipulate molecules transporting through the hot spot of a sub-10 nm conical gold nanopore and acquire the multidimensional structural information of the SMs by surface enhanced Raman scattering (SERS) detection. The sub-10 nm size and conical shape of the plasmonic nanopore guarantee its high detection sensitivity. SERS spectra show a high correlation with the orientations of small-sized single rhodamine 6G (R6G) during transport. Meanwhile, SERS spectra of a single hemoglobin (Hb) reveal both the vertical/parallel orientations of the porphyrin ring and oxygenated/deoxygenated states of Hb. The present study provides a new strategy for bridging the primary sequence and the advanced structure of SMs.
Keyphrases
- single molecule
- label free
- gold nanoparticles
- sensitive detection
- photodynamic therapy
- raman spectroscopy
- loop mediated isothermal amplification
- health information
- molecular dynamics simulations
- healthcare
- density functional theory
- real time pcr
- genome wide
- single cell
- gene expression
- psychometric properties
- dna methylation
- amino acid
- metal organic framework