NMR Study on Resistance Type Humidity Sensors

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (5): 779.

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NMR Study on Resistance Type Humidity Sensors

HUA Shi-Ying¹, WANG Jia-Yu², XIN Yao-Quan²

1. Institute of Theo. Chem., Key Lab. of Mole.Spectra and Mole. Struc., Jilin Univ., Changchun, 130023;
2. Department of Electronic Engineering, Jilin Univeristy

Received:1994-06-09 Revised:1995-01-08 Online:1995-05-24 Published:1995-05-24

Abstract

Abstract: Three resistance type humidity sensors (polyethyl-enimine, polyethyl-ammonium salt and PEO) were studied at various temperatures and humidities by ¹HNMR. The hu miditive sensibility mechanism of these sensors was proposed through the change of chemical shifts. The active hydrogen in the three materials reacts with H₂O to form new active hydro gen, and the exchange interaction of new active hydrogen with old ones is very fast. At the same time, the current carriers are generated. As a result, the resistance of materials is de creased with raising humidity.

Key words: Polyethyl enimine, Polyethylene-ammonium salt, PEO, Humidity sensor, ¹HNMR

CLC Number:

TB381

TrendMD:

HUA Shi-Ying, WANG Jia-Yu, XIN Yao-Quan. NMR Study on Resistance Type Humidity Sensors[J]. Chem. J. Chinese Universities, 1995, 16(5): 779.

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NMR Study on Resistance Type Humidity Sensors

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