| abstract |
A sensing device for sensing an ion concentration in a solution, comprising a first substrate, a second substrate, a sensing layer, and two electrodes. The first substrate, the material of which comprises cellulose. The second substrate is on the first substrate. The sensing layer is on the second substrate. The two electrodes are separately disposed on the sensing layer to expose the sensing layer, and the solution is brought into contact with the sensing layer to measure the resistance value of the solution, and is converted into the concentration of ions in the solution. |