A novel resistive-type humidity sensor based on poly(p-diethynylbenzene)

✍ Scribed by Mujie Yang; Yang Li; Xiaowei Zhan; Mingfang Ling

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 170 KB
• Volume: 74
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19991121)74:8<2010::aid-app16>3.0.co;2-1

✦ Synopsis

Poly(p-diethynylbenzene) (PDEB) synthesized with nickel catalyst Ni(C'CO OC'CH) 2 (PPh 3 ) 2 (NiOC) in dioxane-toluene mixed-solvent system at 25°C shows a rich trans structure with pendant-group (O OC'CH) content of about 35% having higher molecular weight and good solubility. A novel resistive-type humidity sensor based on PDEB is presented. Its humi-sensing characteristics are described and discussed. The impedance of the sensor changed from ϳ 10 3 -10 7 ⍀ in almost the whole humidity range [ϳ 15-92% relative humidity (RH)], which is low compared with sensors based on other humi-sensitive conjugate polymers, and hysteresis of no more than 3% RH was observed. The sensor prepared by Langmuir-Blodgett (LB) deposition method shows the best humidity response. An explanation of humi-sensing behavior of PDEB is attempted by taking into account the interaction between hydrogen protons and super -conjugate orbits in PDEB.