中国物理B ›› 2023, Vol. 32 ›› Issue (8): 80703-080703.doi: 10.1088/1674-1056/ac98a0
Xingyan Shao(邵星炎)1,2, Fuchao Jia(贾福超)1,†, Tingting Liu(刘婷婷)1,2, Jiancheng Liu(刘健诚)1, Xiaomei Wang(王小梅)1, Guangchao Yin(尹广超)1, Na Lv(吕娜)3, Tong Zhou(周通)1, Ramachandran Rajan1,4, and Bo Liu(刘波)1,2,‡
Xingyan Shao(邵星炎)1,2, Fuchao Jia(贾福超)1,†, Tingting Liu(刘婷婷)1,2, Jiancheng Liu(刘健诚)1, Xiaomei Wang(王小梅)1, Guangchao Yin(尹广超)1, Na Lv(吕娜)3, Tong Zhou(周通)1, Ramachandran Rajan1,4, and Bo Liu(刘波)1,2,‡
摘要: A heterojunction structure design is a very good method for improving the properties of semiconductors in many research fields. This method is employed in the present study to promote the gas-sensing performance of Ag3PO4 nanocomposites at room temperature (25 ℃). A nanocomposite of Ag3PO4 nanoparticles and three-dimensional peony-like WO3 (WO3/Ag3PO4) was successfully prepared by the precipitation method. The crystalline phases were analyzed by x-ray diffraction and the microstructure was characterized by scanning electron microscopy and transmission electron microscopy. The chemical bonding states were analyzed by x-ray photoelectron spectroscopy. The gas-sensing performance of WO3/Ag3PO4 sensors was systematically explored at room temperature. The composite sensors possessed a higher response and lower detection limit (1 ppm) to NH3 than those made of a single type of material; this is ascribed to the synergistic effect achieved by the heterojunction structure. Among the different composite sensors tested, gas sensor A5W5 (Ag3PO4:WO3 mass ratio of 5:5) displayed the highest response to NH3 at room temperature. Interestingly, the A5W5 gas sensor exhibited relatively good stability and excellent selectivity to NH3. The A5W5 sensor also displayed a relatively good response under high humidity. The gas-sensing mechanism of the WO3/Ag3PO4 sensors is explained in detail. Taken together, the as-prepared sensor is highly efficient at detecting NH3 and could be suitable for practical applications. In addition, this study also provides a new method for developing Ag3PO4-based sensors in the gas-sensing field.
中图分类号: (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)