期刊
ACS SENSORS
卷 3, 期 8, 页码 1576-1583出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.8b00397
关键词
expanded black phosphorus; few-layer black phosphorus; Co3O4@BP-PEI composite; highly dispersed Co3O4 nanoparticles; NOx; gas-sensing
资金
- Innovative Research Team Program in Chinese Universities [IRT1237]
- Chinese National Natural Science Foundation [2167010747]
Expanded few-layer black phosphorus nanosheets (FL-BP NSs) were functionalized by branched polyethylenimine (PEI) using a simple noncovalent assembly to form air-stable overlayers (BP-PEI), and a Co3O4@BP-PEI composite was designed and synthesized using a hydrothermal method. The size of the highly dispersed Co3O4 nanoparticles (NPs) on the FL-BP NSs can be controlled. The BP-CS (190 degrees C for 5 h) sensor, with 4-6 nm Co3O4 NPs on the FL-BP NSs, exhibited an ultrahigh sensitivity of 8.38 and a fast response of 0.67 s to 100 ppm of NOx at room temperature in air, which is 4 times faster than the response of the FL-BP NS sensor, and the lower detection limit reached 10 ppb. This study points to a promising method for tuning properties of BP-based composites by forming air-stable overlayers and highly dispersed metal oxide NPs for use in high-performance gas sensors.
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