Gas sensor using ionic liquid
View Patent ↗A gas sensor includes a sensitive portion and a plurality of electrodes arranged via the sensitive portion. The sensitive portion includes an ionic liquid and is configured to have electrical resistance that changes when the sensitive portion adsorbs a gas molecule. The ionic liquid preferably includes a hydrophobic anion. The hydrophobic anion preferably includes an organic fluorine compound. The organic fluorine compound preferably has a trifluoromethyl group.
1 . A gas sensor comprising:
a sensitive portion; and
a plurality of electrodes arranged via the sensitive portion, wherein:
the sensitive portion includes an ionic liquid and is configured to have electrical resistance that changes when the sensitive portion adsorbs a gas molecule,
the sensitive portion includes conductive particles and is made electrically conductive by the conductive particles, and
a ratio by mass of the conductive particles to the ionic liquid in the sensitive portion is 2 to 1.
2 . The gas sensor of claim 1 , wherein
the ionic liquid includes a hydrophobic anion.
3 . The gas sensor of claim 2 , wherein
the hydrophobic anion includes an organic fluorine compound.
4 . The gas sensor of claim 3 , wherein
the organic fluorine compound has a trifluoromethyl group.
5 . The gas sensor of claim 1 , wherein
the ionic liquid includes a hydrogen bond acceptor anion.
6 . The gas sensor of claim 1 , wherein
a cation of the ionic liquid includes imidazolium.
7 . The gas sensor of claim 1 , comprising a plurality of sensitive portions respectively including ionic liquids of mutually different types, wherein
the plurality of sensitive portions are arranged to form an array.
8 . The gas sensor of claim 7 , wherein
the plurality of sensitive portions are respectively configured as an ionic liquid including a hydrophobic anion and an ionic liquid including a hydrophilic anion.
9 . The gas sensor of claim 1 , wherein
the conductive particles are carbon black.
10 . The gas sensor of claim 1 , wherein
the conductive particles include an oxide semiconductor.
11 . The gas sensor of claim 10 , wherein
the oxide semiconductor is antimony tin oxide.
12 . The gas sensor of claim 1 , wherein
the ionic liquid has electrical conductivity.
13 . The gas sensor of claim 1 , wherein
the ionic liquid includes an anion,
the anion has a hydrogen bond acceptability parameter less than 0.3.
14 . The gas sensor of claim 1 , wherein
the ionic liquid includes an anion,
the anion has a hydrogen bond acceptability parameter equal to or greater than 0.3 and equal to or less than 0.8.