Novel two-dimensional materials for biosensing and electrochemical catalysis

EasyChair Preprint 1259

Abstract

Two-dimensional materials are attracting dramatically increasing interest due to their unexpected physico-chemical property and broad of potential applications. We focus on the surface and interface engineering of two-dimensional materials to modify the electronic structures and in turn to enhance the catalytic performance. We developed a surface plasmon resonance sensor based on two-dimensional nanomaterial of graphene and antimonene for the specific label-free detection of clinically relevant biomarkers such as miRNA-21 and miRNA-155. The strong interaction between target probes and 2D materials results an variation of the refractive index of graphene and antimonene, which highly enhanced the performances of SPR biosensor. First-principles energetic calculations reveal that antimonene has substantially stronger interaction with ssDNA than the graphene. The detection limit can reach 10 aM, which is 2.3–10,000 times higher than those of existing miRNA sensors. We also report a spontaneous phase transformation of MoS2 from the 2H to the 1T phase, which is induced by the strong interactions between Ir nanoparticles, Co nanosheets, Ni nanosheets, Fe2O3 nanoplates or Pd-Au hybrid nanosheets and MoS2. Particularly, the Co/Ni/Fe nanoplates/MoS2 hydrides become an array of Co/Ni/Fe single atoms covalently bound onto distorted 1T MoS2 nanosheets after electrochemical leaching. These resulting metal/1T MoS2 heterostructures show outstanding catalytic activity for hydrogen evolution reaction, which is much better than that of commercial Pt/C.

Keyphrases: MoS2 phase transformation, SPR biosensor, Two-dimensional nanomaterials, hydrogen evolution

@booklet{EasyChair:1259,
  author    = {Xiaoqiang Cui},
  title     = {Novel two-dimensional materials for biosensing and electrochemical catalysis},
  howpublished = {EasyChair Preprint 1259},
  year      = {EasyChair, 2019}}