Aqueous Exfoliation of Transition Metal Dichalcogenides Assisted by DNA/RNA Nucleotides: Catalytically Active and Biocompatible Nanosheets Stabilized by Acid-Base Interactions


AU: 
Ayan-Varela, M; Perez-Vidal, O; Paredes, JI; Munuera, JM; Villar-Rodil, S; Diaz-Gonzalez, M; Fernandez-Sanchez, C; Silva, VS; Cicuendez, M; Vila, M; Martinez-Alonso, A; Tascon, JMD
SO: 
ACS APPLIED MATERIALS & INTERFACES
Autors del GTQ: 

Línies d'Investigació:

VL: 
9
IS: 
3
BP: 
2835
EP: 
2845
PY: 
2017
SN: 
1944-8244
IF: 
7.50
Any IF: 
2016
Resum: 

The exfoliation and colloidal stabilization of layered transition metal dichalcogenides (TMDs) in an aqueous medium using functional biomolecules as dispersing agents have a number of potential benefits toward the production and practical use of the corresponding two-dimensional materials, but such a strategy has so far remained underexplored. Here, we report that DNA and RNA nucleotides are highly efficient dispersants in the preparation of stable aqueous suspensions of MoS2 and other TMD nanosheets at significant concentrations (up to 5-10 mg mL(-1)). Unlike the case of common surfactants, for which adsorption on 2D materials is generally based on weak dispersive forces, the exceptional colloidal stability of the TMD flakes was shown to rely on the presence of relatively strong, specific interactions of Lewis acid-base type between the DNA/RNA nucleotide molecules and the flakes. Moreover, the nucleotide-stabilized MoS2 nanosheets were shown to be efficient, catalysts in the reduction of nitroarenes (4-nitrophenol and 4-nitroaniline), thus constituting an attractive alternative to the use of expensive heterogeneous catalysts based on noble metals, and exhibited an electrocatalytic activity toward the hydrogen evolution reaction that was not impaired by the possible presence of nucleotide molecules adsorbed on their active sites. The biocompatibility of these materials was also demonstrated on the basis of cell proliferation and viability assays. Overall, the present work opens new vistas on the colloidal stabilization of 2D materials based on specific interactions that could be useful toward different practical applications.

DT: 
Article en revistes indexades
Percentil: 
HIGH
Any Percentil: 
2016
Categoria: 
MATERIALS SCIENCE, MULTIDISCIPLINARY
KW: 
two-dimensional (2D) material; transition metal dichalcogenides (TMDs); colloidal dispersion; nucleotide; DNA; catalyst; hydrogen evolution reaction (HER)