The response of two novel ethynylated polymers, poly[1,4-diethynyl-2,5-bis(butyloxy)benzene] (PEBB) and poly[1,4-diethynyl-2,5bis(octyloxy)benzene (PEOB) to relative humidity (% RH) and alcohols has been investigated. The polymers have been deposited as thin-film membranes on resistive-type devices. PEBB shows a good sensitivity to RH (%) variations in the full range (0-90%), while PEOB is less affected by moisture. Both polymers give a relevant current intensity variation (5 magnitude orders) when exposed to methanol vapours and no response to alcohols with longer alkylic chain was observed. These results suggest that the selectivity of polyynes to hydroxilated molecules can be modulated by the chemical structure, that is in this case by the length of the alkoxy substituents of the benzene moiety in the polymer chain. (C) 2001 Elsevier Science B.V. All rights reserved.
Highly ethynylated polymers: synthesis and applications for humidity sensors / A., Bearzotti; Fratoddi, Ilaria; L., Palummo; S., Petrocco; A., Furlani; C., Lo Sterzo; Russo, Maria Vittoria. - In: SENSORS AND ACTUATORS. B, CHEMICAL. - ISSN 0925-4005. - STAMPA. - 76:1-3(2001), pp. 316-321. (Intervento presentato al convegno 8th International Meeting on Chemical Sensors (IMCS-8) tenutosi a BASEL, SWITZERLAND nel JUL 02-05, 2000) [10.1016/s0925-4005(01)00607-4].
Highly ethynylated polymers: synthesis and applications for humidity sensors
FRATODDI, Ilaria;RUSSO, Maria Vittoria
2001
Abstract
The response of two novel ethynylated polymers, poly[1,4-diethynyl-2,5-bis(butyloxy)benzene] (PEBB) and poly[1,4-diethynyl-2,5bis(octyloxy)benzene (PEOB) to relative humidity (% RH) and alcohols has been investigated. The polymers have been deposited as thin-film membranes on resistive-type devices. PEBB shows a good sensitivity to RH (%) variations in the full range (0-90%), while PEOB is less affected by moisture. Both polymers give a relevant current intensity variation (5 magnitude orders) when exposed to methanol vapours and no response to alcohols with longer alkylic chain was observed. These results suggest that the selectivity of polyynes to hydroxilated molecules can be modulated by the chemical structure, that is in this case by the length of the alkoxy substituents of the benzene moiety in the polymer chain. (C) 2001 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
