Device Structures

Device Structures with Carbon Nanotubes

Block arrangement of highly ordered CNTs to be used for sensing and electronical applications.
Block arrangement of highly ordered CNTs to be used for sensing and electronical applications.

One of the major parts of our research concentrates on exploring potential of carbon nanotubes in various functional devices. Carbon nanotubes are synthesized using water assisted chemical vapor deposition method. In this process, carbon nanotubes were grown on Silicon wafer acting as a substrate using Al/Fe catalyst and small amount of water as a catalyst activator. The catalyst can be structured on silicon wafer, and thereby structured growth of CNTs can be achieved. The typical growth rate of CNTs is 70 to 80 µm per minute and we have achieved growth till a height of ~4 mm in time span of an hour.

Typical chart of phosphorous screen for CNT cold cathode field emitters.
Typical chart of phosphorous screen for CNT cold cathode field emitters.

Carbon Nanotubes, due to their characteristic properties, have numerous applications in various fields of engineering science and technology. Our work mainly concentrates on electrical and chemical field and we are extending it in fields of biological and energy applications. Structured blocks of carbon nanotubes are tested for homogenous field emission or gas sensing properties. Enthusiasm further drives to develop carbon nanotubes based transistors, and other parallel electrical devices which are further incorporated in various sensor applications. Multi functional composite materials of carbon nanotubes show stable field emission, enhanced gas sensing ability andvisible light sensitivity, serving as better catalyst material. We also have used unconventional approaches to design the smart devices such as Micro-reactors from carbon nanotubes, initiated work on artificial Gecko feet.

Publications

  • R. K. Joshi, J. J. Schneider, „Assembly of one dimensional nanostructures into functional 2D and 3D architectures“, Chem. Soc. Rev., (2012), 41 (15), 5285-5312
  • O. Yilmazoglu, A. Popp, D. Pavlidis, J. J. Schneider, D. Garth, F. Schüttler, G. Battenberg, „Vertically aligned multiwall carbon nanotubes for pressure, tactile and vibration sensing”, Nanotechnology, (2012), 23, 085501
  • D. Babu, M. Lange, G. Cherkashinin, A. Issanin, R. Staudt, J. J. Schneider, „Gas adsorption studies of CO2, SO2 and N2 in spatially aligned double walled carbon nanotube arrays“, Carbon, (2013), 61, 616-623
  • D. J. Babu, S. N. Varanakkottu, A. Eifert, D. DeKoning, G. Cherkashinin, S. Hardt, J J. Schneider, „Inscribing wettability gradients onto superhydrophobic CNT surfaces”, Adv. Mater. Interf. , (2014), 1, 1300049