Optical sensor for detecting caesium ions and/or measuring concentration of the same
AssigneeVulcan Photonics Sdn. Bhd.
InventorsKhong Nee KOO, Mei Qun SEAH, Farah Hidayah Binti JAMALUDIN
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Abstract
The invention relates to an optical sensor for detecting Caesium ions and/or measuring concentration of the same in a fluid medium, comprising a resonant structure (1), a surface of which is covered by a layer of a macrocyclic compound (2). The invention further relates to a method for covering a surface of a resonant structure (1) of an optical sensor with a layer of a macrocyclic compound (2) such that the optical sensor is capable of detecting Caesium ions and/or measuring concentration of the same in a fluid medium.
Claims17
An optical sensor for detecting Caesium ions and/or measuring concentration of the same in a fluid medium, comprising:
- a resonant structure (1), a surface of at least a part of which is covered by a layer of a macrocyclic compound,
- characterised in that said macrocyclic compound is brominated dibenzo-24-crown-8, the material index of which changes in accordance with the amount of Caesium ions bound thereby.
A method for covering a surface of a resonant structure (1) of an optical sensor with a layer of a macrocyclic compound (2) such that the sensor is capable of detecting Caesium ions and/or measuring concentration of the same in a fluid medium, comprising steps of:
- performing plasma treatment on the surface using oxygen gas;
- and
- treating the surface using a 2% (v/v) 3-Aminopropyltriethoxysilane (APTES) solution diluted in pure ethanol, at room temperature for a first predetermined time interval;
- characterised by treating the surface using 50 ml of 100 mM brominated dibenzo-24-crown-8 (BDB24C8) solution diluted in a solvent;
- and
- leaving the surface undisturbed for the solvent in the BDB24C8 solution to evaporate, such that the layer of macrocyclic compound (2) is formed on the surface.
Dependencies are inferred from the claim text.