ã€Chinese instrument network instrument research and development】 Since the 1980s, the first report of the molecular structure of DNA molecules - adenine in the surface of gold / silver nanoparticles such as surface-enhanced Raman spectroscopy (SERS), the academic community for adenine surface adsorption issues A large number of spectroscopic experiments and theoretical studies have been performed, but their adsorption on the surface of gold and silver nanoparticles is still difficult to determine, and it is crucial to understand the adsorption conformation of the molecules on the surface to further understand the Raman spectroscopy enhancement effect and mechanism.
SERS spectra of adenine on (left) silver (right) gold nanoparticle substrates: (a) 15N full-labeled (c) unlabeled experimental SERS spectra, (b) 15N full-labeled (d) unlabeled theoretically calculated spectra
Recently, Huang Qing's group, a researcher at the Institute of Technology Biology and Agricultural Engineering of the Chinese Academy of Sciences' Hefei Institute of Physical Science, used the isotope labeling SERS method and quantitative theory to calculate new progress in the analysis of adenine adsorption on the surface of gold/silver nanoparticles. The theoretical modelling was based on a molecular-metal cluster model. The spectra calculated under different models were compared with the experimental spectra of 15N full-labeled and unlabeled adenine SERS. It was concluded that the adenine is N7H isomer on the gold/silver surface. The N3 and N9 nitrogen atoms are doubly coordinated by way of adsorption.
This work not only sheds light on the surface adsorption of adenine on gold/silver nanoparticles, but also explains its surface-enhanced Raman spectra. More importantly, it illustrates the use of isotope SERS combined with quantitative theoretical calculations to study metals. The surface biomolecule adsorption problem is very effective.
The above research work was supported by the National Natural Science Foundation of China, the Natural Science Foundation of Anhui Province, and the National Key Basic Research Development Program. The relevant results were published in The Journal of Physical Chemistry C.
(Original Title: Advances in Adsorption of Surface Biomolecules and SERS Spectra for Gold and Silver Nanomaterials)
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