A team of researchers under the leadership of Prof. Meng Gang from the Hefei Institutes of Physical Science (HFIPS), Chinese Academy of Sciences (CAS), explored the use of polydimethylsiloxane (PDMS) in developing high-performance, humidity-resistant hydrogen sulfide (H2S) sensors, providing a path
S is a colorless, flammable, explosive, highly corrosive, and highly toxic gas, which widely exists in semi-closed and high-humidity locations. Some oxides including delafossite, ZnO, and CuO have a high response to HS is a highly corrosive gas, and its corrosiveness increases with the increase of humidity. This leads to rapid corrosion and degradation of sensors in high-humidity environments, which becomes an important challenge for the practical application of sensors.
In order to solve these problems, scientists evaporated a hydrophobic and semipermeable membrane of polydimethylsiloxane on the Pt single-Zhang Ruofan, first author of the paper, described the biofunctional role of PDMS as “killing two birds with one stone.” PDMS had hydrophobic nature. It could effectively isolate the intrusion of water vapor in the environment, weakened the influence of environmental humidity on the sensor, and significantly improved the long-term stability of the sensor in a humid environment.
On the other side, the micropores in the PDMS membrane could effectively block methyl mercaptan molecules whose diameter was slightly larger than H
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