Modulation the electronic property of 2D monolayer MoS2 by amino acid

Peng Zhang, Zegao Wang, Lei Liu*, Lasse Hyldgaard Klausen, Yin Wang, Jianli Mi, Mingdong Dong

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

67 Citations (Scopus)

Abstract

2D molybdenum disulfide (MoS 2 ) has a strong potential for the detection of biomolecules, however, the specific interactions between individual amino acids and MoS 2 surface are still unclear. Herein, the adsorption properties and electronic structures of amino acid/MoS 2 systems were investigated systematically for the 20 standard amino acids based on density functional theory. The adsorption strength of amino acids on MoS 2 monolayer decreases in the following order: TRP > ARG > PHE > TYR > LYS > HIS > PRO > ASN ≈ MET > LEU > ILE > VAL > GLU > GLN > THR > ASP > CYS > SER > ALA > GLY. The band gap of amino acid/MoS 2 system is determined by the energy level of HOMO orbit of the adsorbed amino acid, in which the higher energy level of HOMO orbit will result in a smaller band gap. As proof of concept, optical and electrical detection of the MoS 2 based transistors with and without amino acid molecules (TRP and CYS) were studied. Adsorption of amino acids on a MoS 2 surface allows their chemical information to be transformed into distinct analytically optical and electronic signals, which opens up new possibilities for fabricating novel MoS 2 based highly selective biosensors.

Original languageEnglish
JournalApplied Materials Today
Volume14
IssueMarch
Pages (from-to)151-158
Number of pages8
DOIs
Publication statusPublished - 2019

Keywords

  • MoS2
  • Amino acid
  • Density functional theory
  • Field effect transistors
  • FIELD-EFFECT TRANSISTOR
  • TRANSITION-METAL DICHALCOGENIDES
  • GRAPHENE
  • HYSTERESIS
  • FUNCTIONALIZATION
  • SENSITIVITY
  • ADSORPTION
  • TRANSPORT

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