Heterostructures of hematite-sensitized W18O49 hollow spheres for improved acetone detection with ultralow detection limit.
- Resource Type
- Article
- Authors
- Xu, Yongshan; Ma, Tiantian; Zheng, Lingli; Zhao, Yingqiang; Liu, Xianghong; Zhang, Jun
- Source
- Sensors & Actuators B: Chemical. Jun2019, Vol. 288, p432-441. 10p.
- Subject
- *METAL oxide semiconductors
*HETEROSTRUCTURES
*DETECTION limit
*ACETONE
*CHEMICAL detectors
*SPHERES
- Language
- ISSN
- 0925-4005
Highlights • W 18 O 49 /α-Fe 2 O 3 hollow heterostructures are designed by a facile method for application in nanosensors. • The α-Fe 2 O 3 sensitizers greatly enhance the acetone detection performances of W 18 O 49 hollow spheres. • The excellent sensing performances are due to the synergistic effect from the porous structure and the interface heterojunctions. Abstract Heterostructures of metal oxide semiconductors present great potential for chemical sensor devices due to the fascinating properties endowed by the multiple materials and the heterointerface. In the present work, W 18 O 49 /α-Fe 2 O 3 hollow heterostructures with different α-Fe 2 O 3 contents are prepared by a hydrothermal method. The chemical composition and structure properties are characterized by multiple techniques. The gas sensing study demonstrates that the W 18 O 49 /α-Fe 2 O 3 hollow heterostructures exhibit superior sensing performances toward acetone against pure W 18 O 49. The composite containing 6.3 wt% α-Fe 2 O 3 delivers the best sensor response and fast response–recovery speed (10 and 31 s), good selectivity, and low limit of detection (86 ppb). The superior gas sensing performance is interpreted by the functions of porous hollow structure and heterojunctions when introducing α-Fe 2 O 3. This work provides a novel structure design for synthesis of high performances gas sensing materials for ppb-level acetone detection. [ABSTRACT FROM AUTHOR]