IngentaConnect Conductivity studies of phosphonated methylcellulose membrane

Authors: Noor, F.W.M.¹; Kudin, T.I.T.¹; Ali, A.M.M.¹; Latif, F.¹; Yahya, M.Z.A.²

Source: Materials Research Innovations, Volume 13, Number 3, September 2009 , pp. 243-245(3)

Abstract:

The phosphonated methylcellulose polymer as a proton conductor was prepared by stirring a solution of methylcellulose and distilled water with H₃PO₄ as dopant salt for ∼24 h. The molarity of H₃PO₄ was varied from 1 to 4M. The phosphonated samples were prepared in the form of membrane by solution cast technique. The stabilities of these membranes were checked by monitoring the conductivity as a function of time when stored at high relative humidity (RH = ∼80%). Conductivity was measured by impedance spectroscopy in the frequency range from 100 Hz to 100 kHz using Hioki 3532-50 LCR Hi-Tester. The conductivity of this film at 80%RH is 2·32 × 10^-3 s cm^-1. The variations of the logarithms of the membrane conductance and resistance show a linear behaviour from lower RH up to 80%RH. The dynamic ranges of these conductance and resistance are high (about three orders of magnitude) which also allow promising use of the membrane as humidity sensor. Furthermore, the effect of temperature on capacitance at high humidity is also studied.

Keywords: PHOSPHONATED MEMBRANE; CONDUCTANCE; CONDUCTIVITY; RELATIVE HUMIDITY

Document Type: Research article

DOI: 10.1179/143307509X440415

Affiliations: 1: Ionic Materials and Devices (iMADE) Research Laboratory, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Malaysia 2: Ionic Materials and Devices (iMADE) Research Laboratory, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Malaysia;, Email: mzay@salam.uitm.edu.my

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