Open AccessUnique hierarchical Sn3O4 nanoflowers decorated with ZnO nanoparticles and their formaldehyde gas sensing properties
Author(s) -
Lei Wang,
Yang Li,
Song Gao,
Wenjing Yue
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/729/1/012103
Subject(s) - formaldehyde , materials science , detection limit , hydrothermal circulation , nanoparticle , selectivity , nanotechnology , response time , heterojunction , chemical engineering , optoelectronics , catalysis , chemistry , chromatography , computer science , organic chemistry , computer graphics (images) , engineering
Gas sensors with high response are highly desirable for the detection of harmful gases in real-time. Herein, the ZnO nanoparticles decorated hierarchical Sn 3 O 4 nanoflowers are synthesized by a hydrothermal method. The gas sensor based on the ZnO/Sn 3 O 4 composites exhibits excellent sensing properties to formaldehyde with a low operating temperature of 180°C. Specifically, the sensor has a response value of 44 for 100 ppm formaldehyde and a fast response time of 5 s. Moreover, it is noteworthy that the proposed gas sensor shows a wide detection range and a low detection limit of 1 ppm. Besides, the ZnO/Sn 3 O 4 sensor exhibits good selectivity for formaldehyde and perfect reproducibility. The sensing mechanism of the gas sensor is discussed, and the heterojunction between ZnO and Sn 3 O 4 enhances the sensing performance of the proposed gas sensor.