Undoped, nitrogen-doped and boron-doped multiwalled carbon nanotube/poly(vinyl alcohol) composite as active layer in simple hydrostatic pressure sensors
- 235 Downloads
We report on hydrostatic pressure sensors prepared using 10 % w/w multiwalled carbon nanotube (MWCNT)/poly(vinyl alcohol) composites. Three types of carbon nanotubes were used in the composites: undoped MWCNTs, nitrogen-doped MWCNTs and boron-doped MWCNTs (B-MWCNTs). The sensor response was tested using an alternating current input, measuring the capacitance and conductance outputs. The sensors based on the three composites show a linear capacitance and conductance sensitivity pressure dependence in the range 50–120 kPa, but a higher sensitivity to pressure dependence above this interval. The highest angular coefficient of the sensitivity, which reached 0.092 kPa−1, was observed for the capacitance sensitivity of the B-MWCNT based composite.
The authors would like to thank CNPq (Brazil), CONACYT (Mexico) and NRF (South Africa) for research grants and Prof Jonas Gruber for the interdigitated electrodes.
- 11.Z.N. Tetana, S.D. Mhlanga, G. Bepete, R.W.M. Krause, N.J. Coville, S. Afr. J. Chem. 65, 39 (2012)Google Scholar
- 12.Z.N. Tetana, Dissertation, Johannesburg, 2012Google Scholar
- 13.S.D. Mhlanga, K.C. Mondal, R. Carte, M.J. Witcomb, N.J. Coville, S. Afr. J. Chem. 62, 67 (2009)Google Scholar
- 18.A.T. Fromhold, Quantum Mechanics for Applied Physics and Engineering (Dover, New York, 1981)Google Scholar