In situ tracking of defect healing and purification of single-wall carbon nanotubes with laser radiation by time-resolved Raman spectroscopy

摘要: Defects and impurities in carbon nanotubes (CNTs), inherent to all synthesis routes, are generally addressed by thermal and/or chemical post treatments. These require atmosphere control, time-consuming temperature ramping, handling, often incur further defects. Furthermore, certain applications nanotube treatments, such as dispersion, that cause unwanted damage. Laser radiation was found drastically increase purity, crystallinity mean inter-defect distance while reducing defects, indicated Raman spectroscopy, effectively annealing our single-wall CNTs. power density times, other words, fluence, were optimised. When applied CNTs with mechanically induced these almost fully eliminated. In addition the tuned of CNTs, unintentional sample modification can occur during measurements if influence exposure time underestimated or disregarded. Fast laser times simple manipulation outdo common purification Additionally, selective shape site-specific parameters come into play interference patterns. Such arrangements alternating tube quality, is, a CNT mat, could be interesting for preferred electronic conduction paths find in, example, interdigitated electrodes sensors.