Two-dimensional (2D) semiconductors
The two-dimensional (2D) semiconductors are non-carbon materials which, similarly to graphene, exist as monolayers of unusual properties. In contrast to graphene, these 2D materials often have a tunable bandgap in the visible – near IR range, and exhibit rich redox chemistry which can be controlled through material design and special processing. Many 2D semiconductors have direct bandgaps whereas the corresponding bulk phases show indirect gaps with smaller energies. Other interesting properties include high carrier mobility and on/off ratio.
The fact that many of these non-carbon 2D materials are semiconductors makes them an attractive choice for producing high-performing electronic switches, photodetectors, photo-transistors and other optoelectronic devices.
2D semiconductors can complement graphene in devices and applications where an energy bandgap is required.
2D -TMD inks containing nanoflakes of different bandgap and colour.
Our 2D inks are formulated with uniform nanoflakes, as shown in these Scanning Electron Microscopy (SEM) images of MoS2 (top) and WS2 (bottom).
2D Transition Metal Dichalcogenides (2D-TMDs)
This group of 2D materials includes MoS2 and WS2, which show great promise for many diverse uses in gas sensing, bio-sensors, supercapacitors, lithium-ion batteries, and sodium-ion batteries. Due to their large surface-to-volume ratio, 2D-TMDs produce sensors with improved sensitivity, selectivity and low-power consumption. The use of 2D-TMDs in energy storage is determined by their large surface area, and large van der Waals gaps between neighbouring layers, which are suitable for intercalation of lithium, sodium and other ions.
Our 2D-TMD inks and pastes contain MoS2 or WS2 nanoflakes of narrow particle size distribution, and with controlled structural and electronic properties. Using our inks, it is possible to deposit novel electronic, optoelectronic and sensor devices on flexible and heat-sensitive substrates, such as paper, polymers and textiles. Additionally, our inks can be used as intermediaries for producing supercapacitor and battery electrodes.