First MoS2 results

28 01 2013

This is the first of the spectra from our MoS2 experiment last week. Having peeled our layer until it was only just visible, we transferred it over on to a SiO2 covered wafer and after a quick look under the microscope we went to our Raman system. The microscope image is the inset to the image, showing the flakes we examined with Raman. The spectra shown in for the large flake in the upper centre of the image

Raman MoS2 spectra

Raman Spectra of a MoS2 flake

The peak shape is interesting, unlike previously published results, we see a higher intensity for the A1g peak in comparison to the E1g peak. As an example, the left hand hand inset is from S. Najmaei et al, (Applied Physics Letters, 100, 013106). Their work details the expected separation between the two Raman peaks and enables the determination of the number of layers. Our separation of 25.6cm-1 indicates that we have bulk material, so it would appear that in addition to enhancing the lateral dimensions of the flakes, we need to continue peeling for longer!



22 01 2013

As promised, here is the update for the exciting news in 2013.

At the end of 2012, we joined the space exploration project being run by JP Aerospace in California and launched some pongsats with our local scouts. We flew all kinds of stuff, from bouncy balls to a troll (don’t ask) in our balls, but perhaps the most interesting was the six axis solar intensity monitor. This was built by a work experience student, who managed to make it onto the BBC local news back in October. This was so successful, we got the bug and when we saw the ‘Ideas Take Flight‘ strapline for the upcoming British Science Festival, the thought was ‘how high?’

This has resulted in a big project, with some twenty teams developing cubesats to launch up to around 100,000 feet sometime in June

British Science Festival space cubesat ideas

Ideas Take Flight … to the Edge of Space

So far, we have held a big kick off event in the Discovery Museum and followed this up with visits to schools and this last week, schools visiting us. Next step, is that we need to think carefully about the circuitry before we all meet up again to squeeze it all in to a 2″ cube.

The last update for today, is that I received my new toy in the post yesterday. Molybdenum Disulphide, potentially the next graphene, is being touted as the next wonder material. A trip to the clean room tomorrow and hopefully we should be up and running in this exciting field by this time next week.

MoS2 Molybdenum Disulphide crystal 2D electronics

Natural Molybdenum Disulphide Crystals