Journal
NANOTECHNOLOGY
Volume 29, Issue 14, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aaabd0
Keywords
cage; core-shell; methanol; gas sensor; hydrothermal synthesis
Funding
- National Natural Science Foundation of China [51562038, 51402257]
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Silver-doped LaFeO3 molecularly imprinted polymers (SLMIPs) were synthesized by a sol-gel method combined with molecularly imprinted technology as precursors. The precursors were then used to prepare SLMIPs cage (SLM-cage) and SLMIPs core-shell (SLM-core-shell) structures by using a carbon sphere as the template and hydrothermal synthesis, respectively. The structures, morphologies, and surface areas of these materials were determined, as well as their gas-sensing properties and related mechanisms. The SLM-cage and SLM-core-shell samples exhibited good responses to methanol gas, with excellent selectivity. The response and optimum working temperature were 16.98 degrees C and 215 degrees C, 33.7 degrees C and 195 degrees C, respectively, with corresponding response and recovery times of 45 and 50 s (SLM-cage) and 42 and 57 s (SLM-core-shell) for 5 ppm methanol gas. Notably, the SLM-cage and SLM-core-shell samples exhibited lower responses (<= 5 and <= 7, respectively) to other gases, including ethanol, ammonia, benzene, acetone, and toluene. Thus, these materials show potential as practical methanol detectors.
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