In general carbon nanotubes have the radial breathing mode and the tangential modes, which are Raman active. In the first category, our study focuses on the different aspects of carbon nanotubes and the tuning of its band-gap by electrochemical bias. (1) Carbon nanotubes (2) Transition metal oxides like Manganites. Raman spectroscopy is an excellent tool to probe the lattice vibrations and its couplings with the magnetic ions in the lattice. Raman spectroscopy of transition metal and rare earth oxides and carbon nanotubes Funded by: DST, Project no. We have also performed the isothermal titration (micro) calorimetry (ITC) experiments to measure directly the binding energies of different nucleobases with single walled carbon nanotube (SWNT). It has been observed that there is a differential binding affinity of different nucleobases with SWNT. Here, we have undertaken ab-initio calculations to get the binding energy of different nucleobases (A, C, G, T) with a (5x5) single wall carbon nanotube (SWNT). Recently, it has been reported that the wrapping of single wall carbon nanotubes (SWNT) by single-stranded DNA (ssDNA) enables not only the separation of metallic tubes from semi conducting tubes but also allow diameter-dependent separation. Part II: Interaction of biomolecules with CNTs:Ĭarbon nanotubes (CNTs) functionalized with biological molecules show great potential in nanotechnology and bioengineering. We are also making sensors based on nanotube polymer composites which can be also used as gas sensor by performing the field emission experiments of nanotube-polymer nanowires. The characteristics of different sensors can be attributed from the I-V curve of nanotube based FET. This aligned mat of nanotubes are using to make the FET devices which can be used as different sensors like gas sensor, bio sensor etc. We have used A.C dielectrophoresis to align the nanotubes between two parallel electrodes of separation ~ 20 m. The schematic diagram of the above sensor is shown in Figure. Therefore this device is highly sensitive to measure the low frequencies.
The frequency range that has been tested is from100 Hz to1 kHz.
We have used this flow-induced voltage in developing an application of the SWNTs as a vibration sensor in liquid environment as well as accelerometer.
When the direction of flow is reversed, the polarity across the SWNTs sensor also changes its sign. The induced voltage depends logarithmically on the flow speed and is only along the flow direction. (A) Recently it is seen that the flow of a liquid on single-walled carbon nanotube (SWNTs) bundles induces a voltage across the nanotube sample. (1) Device based on carbon nanotubes (CNTs) (2) Interaction of biomolecules with CNTs. 563Ĭarbon nanotubes are currently being studied in an effort to understand their novel structural, electronic, and mechanical properties and to explore their immense potential for many applications in nanoelectronics, and as sensors. R&D Projects Carbon Nanotube Based Sensors Funded by: DST, Project no.
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