Acoustic wave H2S sensor comprising a polymer film comprising carboxylate functional groups and lead or zinc cations and manufacturing process
An H 2 S sensor includes at least one acoustic wave transducer and a film having a polymer matrix. The polymer matrix includes carboxylate functional groups and lead or zinc cations. The film may have a thickness of between a hundred nanometres and a 2 microns The H 2 S sensor optionally includes an antenna to remotely interrogate the H 2 S sensor.
1. An H 2 S sensor, comprising at least one acoustic wave transducer and a film comprising a polymer matrix having covalently bound pendant carboxylate functional groups complexed with zinc cations.
2. The sensor according to claim 1 , comprising an antenna which makes it possible to remotely interrogate the sensor.
3. The sensor according to claim 1 , wherein the film exhibits a thickness of between a hundred nanometres and 2 microns.
4. The sensor according to claim 1 , wherein the polymer corresponds to the following chemical formula:
with n, m and p integers.
5. The sensor according to claim 1 , wherein the polymer corresponds to the following chemical formula:
with n, m and p integers.
6. The sensor according to claim 1 , wherein the polymer corresponds to the following chemical formula:
with n, m and p integers.
7. The sensor according to claim 1 , wherein the film exhibits a thickness of between 1 and 5% of the acoustic wavelength.
8. The sensor according to claim 7 , wherein the film exhibits a thickness of between 250 nm and 5 um.
9. The sensor according to claim 1 , wherein the transducer is a surface acoustic wave transducer.
10. The sensor according to claim 9 , comprising a delay line comprising the surface acoustic wave transducer and a mirror.
11. The sensor according to claim 9 , comprising a transducer positioned between two mirrors, the said sensitive layer being positioned between the said transducer and one of the said mirrors.
12. The sensor according to claim 1 , wherein the transducer is a volume acoustic wave or Lamb acoustic wave transducer.
13. The sensor according to claim 1 , wherein the transducer comprises a substrate made of lithium niobate or made of lithium tantalate.
14. An H 2 S detection device comprising:
a sensor according to claim 1 ;
a radiofrequency interrogation means;
a means for detecting the response of the said sensor.
15. The device according to claim 14 , comprising a means for analysis of the speed or of the insertion losses of the acoustic wave in order to identify the presence of the compound H 2 S.
16. An H 2 S sensor comprising:
an acoustic wave transducer;
a film including a polymer matrix having covalently bound pendant carboxylate functional groups complexed with lead or zinc cations, wherein the film exhibits a thickness of between 1 and 5% of the acoustic wavelength; and
an antenna for remotely interrogating the sensor.
17. An H 2 S sensor comprising:
an acoustic wave transducer;
a film including a polymer matrix having covalently bound pendant carboxylate functional groups complexed with lead or zinc cations, wherein the polymer corresponds to the following chemical formula:
with n, m and p integers, wherein the film exhibits a thickness of between 1 and 5% of the acoustic wavelength; and
an antenna for remotely interrogating the sensor.