Gas sensor for detecting volatile organic compounds and method for manufacturing same
Discussed is a gas sensor for detecting volatile organic compounds, the gas sensor including a substrate including a non-conductive material, an electrode located on the substrate and including a conductive material, and a sensing layer configured to be in contact with at least a portion of the electrode or to cover the electrode, the sensing layer reacting to a predetermined gas, wherein the sensing layer includes a compound of SnO 2 with an alkali metal oxide or an alkaline earth metal oxide. The sensing layer specifically reacts to formaldehyde among volatile organic compounds. When the sensing layer detects formaldehyde by connecting electrodes to each other, the sensing layer can detect the formaldehyde by checking a change in current in the electrode.
1 . A gas sensor for detecting volatile organic compounds, the gas sensor comprising:
a substrate including a non-conductive material;
at least one pair of electrodes located on the substrate and including a conductive material, the at least one pair of electrodes being electrically connected to an outside; and
a sensing layer configured to be in contact with at least a portion of the at least one pair of electrodes or to cover the at least one pair of electrodes, the sensing layer reacting to a formaldehyde,
wherein the sensing layer comprises Mg—SnO 2 .
2 . The gas sensor of claim 1 , wherein the at least one pair of electrodes include indium tin oxide (ITO).
3 . The gas sensor of claim 1 , wherein the at least one pair of electrodes comprise a first electrode formed on the substrate, and a second electrode formed on the substrate by being spaced apart from the first electrode, and
wherein the sensing layer is disposed to connect the first electrode with the second electrode.
4 . The gas sensor of claim 3 , wherein the sensing layer is configured to expose at least a portion of each of the first electrode and the second electrode to air.
5 . The gas sensor of claim 1 , wherein a heater is provided on the substrate, the heater being located on a surface of the substrate on which the at least one pair of electrodes are located or on a surface opposite to the surface of the substrate on which the at least one pair of electrodes are located.
6 . The gas sensor of claim 1 , wherein the sensing layer has a curved outer surface.
7 . The gas sensor of claim 1 , wherein the formaldehyde is incorporated into a lattice structure of the sensing layer, and
wherein at least one of ethanol and toluene is not incorporated into the lattice structure of the sensing layer.
8 . A gas sensor for detecting volatile organic compounds, the gas sensor comprising:
a substrate including a non-conductive material;
a sensing layer located on the substrate, the sensing layer reacting to formaldehyde, and the sensing layer being made of Mg—Sno 2 ; and
at least one pair of electrodes including a conductive material and configured to detect electron movement and capacitance inside the sensing layer, the at least one pair of electrodes being electrically connected to an outside,
wherein the at least one pair of electrodes comprise a first electrode including a conductive material, and a second electrode configured to supply conduct an electric current to the first electrode or to conduct an electric current from the first electrode, and
wherein the sensing layer connects the first electrode with the second electrode and is configured to expose at least a portion of each of the first electrode and the second electrode to air.
9 . The gas sensor of claim 8 , wherein the sensing layer is disposed between the substrate, and the first electrode and the second electrode.
10 . The gas sensor of claim 9 , wherein the first electrode and the second electrode are provided on an outer surface of the sensing layer.
11 . The gas sensor of claim 10 , wherein the sensing layer is rectangular in shape.
12 . The gas sensor of claim 8 , wherein the sensing layer shields a portion of the first electrode and a portion of the second electrode.
13 . The gas sensor of claim 8 , wherein a heater is provided on the substrate, the heater being located on a surface of the substrate on which the at least one pair of electrodes are located or on a surface opposite to the surface of the substrate on which the at least one pair of electrodes are located.
14 . A method for manufacturing a gas sensor for detecting volatile organic compounds, with the gas sensor having a sensing layer configured to connect electrodes to each other formed on a substrate, the method comprising:
forming the electrodes using indium tin oxide (ITO), and
forming the sensing layer by using Mg—SnO 2 ,
wherein the sensing layer is formed by dispersing and applying the Mg—SnO 2 onto a mixed solution of pure water and glycerin and heating the mixed solution, onto which the Mg—SnO 2 is applied, to a predetermined temperature.
15 . The method of claim 14 , wherein forming of the sensing layer forms the sensing layer between the substrate and the electrodes.
16 . The method of claim 14 , wherein forming of the electrodes forms the electrodes between the substrate and the sensing layer.