Undoped, nitrogen-doped and boron-doped multiwalled carbon nanotube/poly(vinyl alcohol) composite as active layer in simple hydrostatic pressure sensors
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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.
KeywordsCarbon Nanotubes Pressure Sensor Multiwalled Carbon Vinyl Alcohol Carbon Sphere
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.
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