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Wood-based/polymer-derived nanoporous carbon composites were tested as ammonia sensors for gas concentrations from 45 to 500 ppm. A synergy between the composite components affected their electrical response. Incorporation of only a 1% polymer-derived carbon phase was sufficient to convert the conduction type of the carbon matrix and to increase the sensitivity. An increase in the amount of the polymer-derived...
Activated carbons, either synthetic, developed in our laboratory, or commercial were prepared or further modified, in order to introduce specific heteroatoms such as oxygen, nitrogen and sulfur to their matrix. Chips with thin layers of active materials were prepared and used for ammonia or hydrogen sulfide sensing. They showed high sensitivity and their response was selective. They also responded...
The design of S- and N-dual-doped carbon-based ammonia sensors is reported for the first time. The materials are exposed to NH3 concentrations varying from 45 ppm to 500 ppm in dry air and normalized resistance changes are recorded. The response time is 40 s and the chips exhibit excellent reversibility and repeatability of the signal after continuous NH3/air cycles. The synergistic effect of N- and...
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