A powerful laser technique typically used for analysis is now doubling as a precision engineering tool, opening new possibilities for nanoscale device manufacturing. That was the key message from a talk delivered today by Dr Miroslav Haluska, who showcased how Raman spectroscopy is transforming the way carbon nanotube sensors are built and refined. The talk was hosted at the Cambridge Graphene Centre as part of the QAMSS lecture series.
Carbon nanotubes (CNTs) have long been seen as promising components for next-generation electronics and gas sensors. However, turning that promise into practical devices has been hindered by challenges in producing, identifying and integrating individual nanotubes with high precision. The talk highlighted how Raman spectroscopy offers a solution at multiple stages of this process.
As a monitoring tool, Raman spectroscopy enables researchers to assess critical nanotube properties such as diameter, structural quality and type without damaging the material. By analysing characteristic spectral features and using Raman mapping, scientists can accurately locate individual nanotubes and select the most suitable ones for device integration. The method was shown to achieve detection rates of up to 96%, rivalling more traditional imaging techniques.
Beyond observation, the technique also plays an active role in fabrication. The same laser used for measurement can locally modify nanotubes, removing contamination or introducing controlled defects that influence device performance.
This dual functionality positions Raman spectroscopy as both a diagnostic and fabrication tool, marking a significant step forward in the scalable production of high-performance nanosensors.