Abstract
Liver is one of the main organs of the body metabolism, and its related diseases are very important issues. In this paper, ultra-thin 10 nm indium nitride as a sensing material, designed as a gas sensor to detect the human body exhalation in the sub-ppm grade of volatile gas concentration, will replace the traditional invasive blood analysis used to detect liver-related disease. As a result of the semiconductor material made of the sensing chip, its excellent electrical properties allow the concentration of the gas can also be easily detected, the membrane and the gas exchange between the electronic sensing mechanism will produce electrical signals, but also due to the chip sensitivity. Therefore, the application of the sensor is very important for the gas selectivity, if it can improve the selectivity of the gas, the specific gas signal credibility will be greatly improved. At present, the ammonia gas is which expected to measure, the body exhalation got more than two hundred kinds of gases, and indium nitride sensor for ammonia and acetone reaction signal ratio is about 1: 0.95, So the noise gas acetone is the primary target. The results show that the use of 10cc non-polar silicone oil as absorbent in the acetone mixed gas simulation experiment found that it is effective to absorb about 40% of the acetone noise. In order to improve the acetone gas absorption, in addition to finding the best absorbent for the specific gas, we have identified several parameters to enhance the ability to filter out acetone noise. In the simulation experiment, proved that the design method can enhance the 10cc silicone oil absorbent 80% acetone noise gas absorption efficiency. And we finish a 5cm*1.5cm*3cm filter, which could be used independently without affecting the chips high sensitivity characteristics, it is used in liver malfunction breath examination.