Sensors nanofiber humidity

Preparation of PANI nanofiber humidity sensors produced by electrospinning from the DMF solution of PANI, poly(vinyl butyral) (PVB), and PEO were shown. It was concluded that PANI nanofibers with some beads and a small content of PEO revealed... 

Lin Q., Li Y, and Yang M., Potyaniline nanofiber humidity sensor prepared by electrospinning. Sens Actuators, 2012,161,967- 972. 

Figure 5. Humidity dependence of resistivity for PE0/LiCl04 sensors (a) the nanofiber sensor and (b) the film sensor (35).

Electrospun nanofibers of several polymers, among others PVB were used in a surface acoustic wave resonator (30). The surface acoustic wave resonator is used as an ultrafast response humidity sensor. 

The experiments indicated that PVB is suitable as a matrix to form nanofibers together with poly(ardline) (PANI) by electrospinning. Electrospun PANl/PVB nanofibers exhibited a very high sensitivity of 75 kHz/% relative humidity from 20-90% relative humidity. Further, an ultrafast response of 1-2 s for humidification and desiccation was reported. In addition, the sensor could detect humidity levels as low as 0.5% relative humidity (30). 

Snow AW, Barger WR (1989) Phthalocyanine films in chemical sensors. In Kadish KM, Smith KM, Guilard R (eds) Phthalocyanines - properties and applications. VCH, New York, pp 343-392 Songa X, Qi Q, Zhang T, Wang C (2009) A humidity sensor based on KQ-doped SnO nanofibers. Sens Actuators B... 

Nanofiber based sensors for hydrogen peroxide and humidity demonstrated. 

Figure 4.15 (a) Scheme of a humidity sensor based on polymer nanofibers... 

Lei S, Chen DJ, Chen YQ (2011) A surface acoustic wave humidity sensor with high sensitivity based on electrospim MWCNT/Nafion nanofiber films. Nanotechnology 22(26)... 

Intensive research effort has been focused on using nanoscale structures to significantly improve the performances (sensitivity, selectivity, response and recovery speed) of the SAW sensors. Liu et al. [39] reported that dynamic chemical vapor SAW sensors have been developed by depositing electrospun polyethylene oxide nanofibrous membranes on the surface of ST-cut quartz the response time of the sensors was 5 min (Fig. 11.2a). Lin [42] constructed a SAW humidity sensor by casting polyaniUne/poly(vinyl butyral) nanofibers on SAW resonator the as-prepared sensor could detect 0.5 % relative humidity in 1 s. Electrospun poly(vinyl pyrrolidone) (PVP)/LiTa03 composite nanofibrous membranes were coated onto the surface of SAW electrode to assay H2 the results indicated that the sensors sensitivity, response time, and recovery time could be remarkably improved and reached 1 %, 120, and 200 s by regulating the electrospinning parameters [43]. 

Lin Q, Li Y, Yang M (2012) Highly sensitive and ultrafast response surface acoustic wave humidity sensor based on electrospun polyaniline/poly(vinyl butyral) nanofibers. Antil Chim Acta 748 73-80. doi 10.1016/j.aca.2012.08.041... 

Zhang H, Li Z, Liu L, Wang C, Wei Y, MacDiarmid AG (2009) Mg +/Na" -doped rutile Ti02 nanofiber mats for high-speed and anti-fogged humidity sensors. Talanta 79(3) 953-958. doi 10.1016/j.talanta.2009.05.035... 

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