Fiber optic sensors based on hybrid phenyl-silica xerogel films to detect n-hexane: determination of the isosteric enthalpy of adsorption

• Jesús C. Echeverría,
• Ignacio Calleja,
• Paula Moriones and
• Julián J. Garrido

Beilstein J. Nanotechnol. 2017, 8, 475–484, doi:10.3762/bjnano.8.51

• pressure and condensation of the adsorbate on the mesopores was dominant at higher relative pressure. Keywords: fiber optic sensors; isosteric enthalpy of adsorption; n-hexane; phenyl-silica; xerogel films; Introduction Fiber optic chemical sensors (FOCSs) that employ sensitive films for the detection of

• the reflectance at the fiber–film interface and the sensor output signal. Furthermore, the reflectance is independent of temperature. The response of fiber optic sensors operating on reflection relies on the complex refractive index of the film and on the adsorption properties, which are related to