Issue 35, 2016

Novel insights into l-cysteine adsorption on transition metal doped graphene: influences of the dopant and the vacancy

Abstract

Exploring potential applications of transition metal (TM) doped graphene in biomolecular adsorption is of fundamental relevance to the area of nanobiotechnology. Herein, we investigated L-cysteine adsorption on first-row transition metal (Sc–Zn) doped single-vacancy and double-vacancy graphenes (MSVs and MDVs) using density functional theory calculations. Three types of upright adsorption configurations, via unprotonated S-end, O-end and N-end functional groups, were considered. All the MSVs chemically adsorb L-cysteine with no regular variation tendency. MDVs show decreasing chemisorption from V to Co, followed by emergence of physisorption from Ni to Zn. L-Cysteine adsorption on MDVs is weaker than that on MSVs, starting from Mn to Zn. Both the TM dopant and the vacancy type contribute to adsorption tendency. In addition, site-specific chemisorption is revealed. The magnetic behaviour of the adsystems is also interesting. In particular, FeSV, ZnSV and NiSV become magnetic after all three end-type adductions. L-Cysteine adsorption induced distribution of the increasing number of 3d electrons and TM–C interactions could account for the magnetism mechanism. Interesting magnetization patterns of MSVs and MDVs occur in most magnetic chemisorbed systems, exhibiting different mirror symmetries. This study could facilitate applications of TM doped graphenes in biosensing, biomolecule immobilization, magnetic bioseparation and other fields in bionanotechnology.

Graphical abstract: Novel insights into l-cysteine adsorption on transition metal doped graphene: influences of the dopant and the vacancy

Supplementary files

Article information

Article type
Paper
Submitted
02 Dec 2015
Accepted
08 Mar 2016
First published
10 Mar 2016

RSC Adv., 2016,6, 29830-29839

Author version available

Novel insights into L-cysteine adsorption on transition metal doped graphene: influences of the dopant and the vacancy

H. Luo, H. Li, Z. Xia, Y. Chu, J. Zheng, Z. Hou and Q. Fu, RSC Adv., 2016, 6, 29830 DOI: 10.1039/C5RA25599F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements