Multishell SnO 2 Hollow Microspheres Loaded with Bimetal PdPt Nanoparticles for Ultrasensitive and Rapid Formaldehyde MEMS Sensors.
Haijie CaiNa LuoQingmin HuZhenggang XueXiaohong WangJiaqiang XuPublished in: ACS sensors (2022)
Low-cost and real-time formaldehyde (HCHO) monitoring is of great importance due to its volatility, extreme toxicity, and ready accessibility. In this work, a low-cost and integrated microelectromechanical system (MEMS) HCHO sensor is developed based on SnO 2 multishell hollow microspheres loaded with a bimetallic PdPt (PdPt/SnO 2 -M) sensitizer. The MEMS sensor exhibits a high sensitivity to HCHO (( R a / R g - 1) % = 83.7 @ 1 ppm), ultralow detection limit of 50 ppb, and ultrashort response/recovery time (5.0/7.0 s @ 1 ppm). These excellent HCHO sensing properties are attributed to its unique multishell hollow structure with a large and accessible surface, abundant interfaces, suitable mesoporous structure, and synergistic catalytic effects of bimetal PdPt. The well-defined multishell hollow structure also shows fascinating capacities as good hosts for noble metal loading. Therefore, PdPt bimetallic nanoparticles can be employed to construct a synergistic sensitizer with a high content and good dispersity on this multishell hollow structure, further exhibiting a reduced working temperature and ultrasensitive detection of HCHO. This PdPt/SnO 2 -M-based MEMS sensor presents a unique and highly sensitive means to detect HCHO, establishing its great promise for potential application in environmental monitoring.
Keyphrases
- molecularly imprinted
- low cost
- metal organic framework
- room temperature
- solid phase extraction
- cancer therapy
- reduced graphene oxide
- loop mediated isothermal amplification
- label free
- perovskite solar cells
- drug delivery
- gold nanoparticles
- climate change
- oxidative stress
- real time pcr
- human health
- mass spectrometry
- machine learning
- crystal structure