Sweat sensing device and method for forming the same

A method for forming a sweat sensing device, the method comprising:

• providing a continuous piece of hydrophilic paper with a pre-determined shape of
• a first region for receiving sweat,
• a second region for evaporating the sweat,
• a third region for sensing the sweat,
• a first channel arranged between the first region and the third region, and
• a second channel arranged between the second region and the third region,
• wherein the first channel and the second channel are for the sweat to diffuse through to reach the respective regions;
• providing a flexible hydrophobic film having an opening;
• arranging the flexible hydrophobic film and the continuous piece of hydrophilic paper adjacent to each other with the opening aligned to and exposing the second region;
• providing a sensor unit over the second region;
• and
• collectively folding the continuous piece of hydrophilic paper and the flexible hydrophobic film into a stacked manner such that the sensor unit is sandwiched between the third region and the second region.