Selenium covalently modified graphene: towards gas sensing
- Jiri Sturala, Jan Luxa, Jan Plutnar, Zbyněk Janousek, Zdeněk Sofer*, Martin Pumera*
The research in the area of graphene derivatives containing chalcogen elements is currently an exclusive domain of oxygen- and sulfur-containing functional groups. Here we report an effective introduction of selenium-based organic functional groups and propose a mechanism of their attachment to graphene and graphene-related materials. Fluorographene can be effectively functionalized by selenium-containing group, forming C-Se bonds without undesired formation of elemental selenium, using selenourea. A similar reaction on graphene oxide is accompanied by the formation of elemental selenium due to oxidation of selenourea by oxygen-containing functional groups of graphene oxide. The formation of C-Se bonds was confirmed by several spectroscopic methods. The selenium covalently-modified graphene represents the first example of graphene-selenium compound with potential application in gas sensing.
Hexagonal and Cubic Boron Nitride in Bulk and Nanosized Forms and Their Capacitive Behavior
Impurities in graphene/PLA 3D-printing filaments dramatically influence the electrochemical properties of the devices