Highly sensitive formaldehyde chemical sensor based on in situ precipitation synthesis of ZnSnO3 microspheres

Abstract

Highly sensitive formaldehyde chemical sensor was fabricated using uniform and mono-disperse ZnSnO 3 microspheres, which were successfully prepared by a template-free, economical in situ precipitation method combined with subsequent calcination. The orientation and morphology of the precursor, ZnSn(OH) 6 microspheres, were carefully controlled by adjusting the added amount of NaOH. This facile process may provide an approach to synthesis of functional nanomaterials with unique structures and excellent physicochemical properties. Moreover, the asfabricated sensors based on the ZnSnO 3 microspheres showed high response and short response-recovery time toward formaldehyde. To 50 ppm formaldehyde, the sensor response (S) was 17 at a working temperature of 260°C, and the response and recovery time were 6 and 18 s, respectively. The gas response of sensors based on the ZnSnO 3 microspheres was linear with the concentration of formaldehyde in the range of 5-100 ppm with a correlation coefficient of 0.997. These results showed that the as-prepared ZnSnO 3 microspheres have a potential application in gas sensor.

Highly Rapid and Sensitive Formaldehyde Detection at Room Temperature Using a ZIF-8/MWCNT Nanocomposite

“…For example, Jia et al fabricated a formaldehyde sensor by ZnSnO 3 , which could detect formaldehyde at a concentration range of 5−100 ppm; however, the working temperature for this sensor was higher than 200 °C. 21 In addition, Chimowa et al tested encapsulated zinc, zinc oxide, and iodine within double-walled carbon nanotubes (CNTs) for detection of various mass concentrations of formaldehyde ranging from 1.8 to 4%. 22 In this research, we selected ZIF-8 as an acceptable sensing material for sensing formaldehyde based on the literature.…”

“…Furthermore, in the case of formaldehyde, some works have been done which report detection of different concentrations of formaldehyde by resistive sensors. For example, Jia et al fabricated a formaldehyde sensor by ZnSnO 3 , which could detect formaldehyde at a concentration range of 5–100 ppm; however, the working temperature for this sensor was higher than 200 °C . In addition, Chimowa et al tested encapsulated zinc, zinc oxide, and iodine within double-walled carbon nanotubes (CNTs) for detection of various mass concentrations of formaldehyde ranging from 1.8 to 4% …”

Highly Selective Voltammetric Sensor for l-Tryptophan Using Composite-Modified Electrode Composed of CuSn(OH)6 Microsphere Decorated on Reduced Graphene Oxide

“…In recent years, metal hexahydroxystannate (MSn­(OH) 6 ; MHS; M = Zn, Co, Sr, Ca, and Cu) with d 10 –d 10 configuration, belonging to the perovskite family, has been found to have excellent physical and chemical properties due to its special cell structure. , It is a kind of transition-metal stannite possessing various morphologies sizes and shapes. As is well known, it can be used in a number of areas, such as gas, optical, and magnetic sensors, − photocatalysts, and so on, owing to its intrinsic merits, including large specific surface area, cost-effectiveness, environmental friendliness, morphological diversity, and high catalytic activity. It is expected that the MHS materials would significantly improve the electrocatalytic properties, stability, and reproducibility of the electrode, as well as further reduce drawbacks in overpotential but increase the reaction rate .…”

Synthesis of Hollow ZnSnO3 Nanospheres with High Ethanol Sensing Properties

“…As an important ternary semiconducting oxide, zinc stannate (ZnSnO 3 ) has been attracting considerable attention for its potential application in various fields, such as gas sensor [1,2], photo-catalyst [3], and lithium-ion batteries [4]. Various ZnSnO 3 nanostructures, including nanotubes, nanorods, nanocages, hollow structures, and so on, have been synthesized by a variety of methods [5][6][7][8]. Among these types, hollow structures have aroused a great deal of interests due to their low density, large reaction surface area, high porosity, and surface permeability, which are considered greatly beneficial to the enhancement of gas-sensing performance.…”