Carbon nanotubes and nanohybrids for next generation field emission electron sources

Title : Carbon nanotubes and nanohybrids for next generation field emission electron sources

Abstract:

We present here field emission (FE) properties of two types of nanostructured composite films, promising novel materials for third generation electron sources and displays: (i) Nanoparticle decorated multi-walled carbon nanotubes (MWCNTs)-and (ii) metal-insulator nanocomposite thin-films. FE measurements were carried out in an indigenously developed high vacuum diode set up. The salient results obtained can be summarized as (i) a significant improvement of FE current and temporal stability associated with an appreciable reduction in turn-on field from metal nanoparticle decorated MWCNT-films as compared to only MWCNT films: showing promises for electron-guns, x-ray sources etc.; (ii) appreciable increase in FE current density with high mechanical durability in metal nanoparticles embedded in thin silica matrix  by optimized swift heavy ion irradiations: promising planar emitter for future flat-displays. The enhanced FE characteristics of these planar emitters are understood from a combined experimental and first-principles based calculations study.

Biography:

Santanu Ghosh, Professor in Physics at IIT Delhi, Editorial board member, Scientific Report (Nature portfolio) has long expertise in the field of field emission from Cabon nanotubes and nanocomposites. He is PI of 5 international projects, which include one prestigious CRP funded by IAEA, UNO. He is also PI of 8 national project. He has delivered ~ 60 invited talks, published two books, 6 book chapters and ~150 papers in peer reviewed journals. He was DST-BMBF fellow (year 2000), DST-DFG fellow (year 2005), DAAD Fellow (2010, 2013), Delegate IAEA (2012, 2014), IAAM medal scientist awardee, (2023), National co-coordinator, PMRF (2000-2022).