Description
The diameter of the semiconducting single walled nanotubes range in 1.2-1.7 nm, whereas the length varies from 100nm to 4 μm. The degree of purity of the SWNTs can be determined from the absorbance spectrum. The optical absorbance of metallic SWNTs occurs at M11 peaks (550-800nm).
Application
MoS2 has an indirect band-gap of 1.23 eV for bulk single crystal or multi-layer films. However, single atomic layers have a direct band-gap of 1.9 eV. Due to its layered structure, MoS2 is highly anisotropic with excellent nonlinear optical properties. It is widely used as a high-performance lubricant.
As a result of its direct band-gap, single-layer MoS2 has received much interest for applications in electronic and optoelectronic devices (such as transistors, photodetectors, photovoltaics and light-emitting diodes). It is also being explored for applications in photonics, and can be combined with other TMDCs to create advanced heterostructured devices.