The development of novel organically modified sol-gel media for use with ATR/FTIR sensing

Flavin, K. and Mullowney, J. and Murphy, B. and Owens, E. and Kirwan, P. and Murphy, K. and Hughes, H. and McLoughlin, P. (2007) The development of novel organically modified sol-gel media for use with ATR/FTIR sensing. Analyst, 132 (3). pp. 224-229. ISSN 0003-2654

Full text not available from this repository. (Request a copy)


The ability to prepare and develop novel pre-concentration media by the sol-gel process, and their integration with mid-infrared transparent waveguides has been demonstrated. This research approach resulted in a mid-infrared sensing methodology in which the properties (porosity, functionality, polarity, etc.) of the recognition layer could be tailored by variation of the sol-gel precursors and processing conditions. Cross-linker type and concentration notably influenced p-xylene absorption and diffusion rate. Unreacted silanol groups appeared to be the dominant factor in the hydrophobicity of sol-gel layers. Variation of sol-gel precursors and thermal treatment altered both film cross-link density and polarity, as demonstrated by variation in the rate of analyte diffusion and equilibrium analyte concentration. The use of a novel 1: 1 PTMOS: DPDMS material as pre-concentration medium in this analytical sensing approach was validated through the determination of p-nitrochlorobenzene in an aqueous environment. The response demonstrated linearity between 0-30 mg L -1 with a correlation coefficient of 0.989 and a limit of detection of 0.7 mg L-1. Sensing times for p-nitrochlorobenzene were also reduced from several hours to 24 minutes, without loss of measurement accuracy or sensitivity, by a 10°C increase in the sensing temperature and the use of a predictive Fickian model previously developed by this research group.

Item Type: Article
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1600/1602
Departments or Groups:
Depositing User: Admin SSL
Date Deposited: 19 Oct 2022 23:01
Last Modified: 31 Jul 2023 16:05

Actions (login required)

View Item View Item