期刊
ACS SENSORS
卷 5, 期 2, 页码 571-579出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b02519
关键词
hydrophobic core-shell heterostructure; N-C@alpha-Fe2O3 nano-olives; TEA selective; humidity resistance; all-vapor-phase processing method
资金
- National Natural Science Foundation of China [51762005, 61771267, 61971250]
- Natural Science Foundation of Guangxi Province, China [2017GXNSFAA198254]
- Science and Technology Project of Guangxi [AD17129063]
- Science and Technology Major Project of Guangxi [AA17202020, AA17204100, AA18242007]
- State Key Laboratory of Bioelectronics of Southeast University
- Natural Science Foundation of Ningbo City [2017A610229, 2018A610092]
- Humanity and Social Science Foundation of Chinese Education Department [19YJC880053]
- Natural Science Foundation of Zhejiang [LQ18F010008]
- Philosophy and Social Science Planning Project of Zhejiang [19NDJC0103YB]
- Innovation Project of Guangxi Graduate Education [YCSW2018029]
During the detection of industrial toxic gases, such as triethylamine (TEA), poor selectivity and negative humidity impact are still challenging issues. A frequently reported strategy is to employ molecular sieves or metal-organic framework (MOF) membranes so that interference derived from surrounding gases or water vapor can be blocked. Nevertheless, the decline in the response signal was also observed after coating these membranes. Herein, an alternative strategy that is based on a hydrophobic, TEA adsorption-selective p-n conjunction core-shell heterostructure is proposed and is speculated to simultaneously enhance selectivity, sensitivity, and humidity resistance. To verify the practicability of the proposed strategy, a thickness-tunable nitrogen-doped carbon (N-C) shell-coated alpha-Fe2O3 nano-olive (N-C@alpha-Fe2O3 NO)-based core-shell heterostructure that is obtained via a unique all-vapor-phase processing method is selected as the research example. After forming the core-shell heterostructure, a relatively hydrophobic and TEA adsorption-selective N-C@alpha-Fe2O3 NO surface was experimentally confirmed. Particularly, a chemiresistive sensor that comprises N-C@alpha-Fe2O3 NOs exhibits satisfactory selectivity and response magnitude to TEA when compared with the sensor using alpha-Fe2O3 NOs. The detection limit can even reduce to be 400 ppb at 250 degrees C. Furthermore, the sensor based on N-C@alpha-Fe2O3 NOs shows desirable humidity resistance within the relative humidity (RH) range of 30-90%. For practical usage, a sensing prototype based on the N-C@alpha-Fe2O3 NO probe is fabricated, and its satisfactory sensing performance further confirms the potential for future applications in industrial organic amine detection. These promising results show a bright future in enhancing the humidity resistance and selectivity as well as sensitivity of chemiresistive sensors by simply designing a hydrophobic and target gas adsorption (e.g., TEA) preferred p-n junction core-shell heterostructure.
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