Enhanced NO2 Sensing Performance of ZnO-SnO2 Heterojunction Derived from Metal-Organic Frameworks

Abstract

Nitrogen dioxide (NO2) is the major reason for acid rain and respiratory illness in humans. Therefore, rapid, portable, and effective detection of NO2 is essential. Herein, a novel and simple method to construct a ZnO-SnO2 heterojunction is fabricated by pyrolysis of bimetallic metal organic frameworks. The sensitivity of ZnO-SnO2 heterojunction towards 0.2 ppm NO2 under 180 °C is 37, which is 3 times that of pure ZnO and SnO2. The construction of heterojunction speeds up the response-recovery process, and this kind of material exhibits lower detection limit. The construction of heterojunction can significantly improve the NO2 sensitivity. The selectivity, stability, and moisture resistance of ZnO-SnO2 heterojunction are carried out. This could enable the realization of highly selective and sensitive portable detection of NO2.

Farming of ZnO−SnO2 Nanocubes for Chemiresistive NO2 Gas Detection

“…We have compared the sensing properties of the present sensor with the other reported [15,21,22] ZnO−SnO 2 sensors as shown in Table 1. It shows that gas sensor reported in present work shows fast response as compared to other reported sensors.…”

“…Among the various metal oxides, SnO 2 (n‐type) and ZnO (n‐type) have been intensively studied for the detection of toxic gases such as H 2 , CO, NH 3 , NO 2 , H 2 S, LPG, etc. because of its extraordinary properties like wide band gap energy, high carrier transport, high mobility and easily available in the nature [7–10] . The ZnO−SnO 2 nanocomposite has been synthesized via different chemical techniques such as spin coating, hydrothermal method, successive ionic layer adsorption and reaction (SILAR), coprecipitation method and chemical bath deposition (CBD) etc [11–14] .…”

Ppb-Level Hydrogen Sulfide Gas Sensor Based on the Nanocomposite of MoS2 Octahedron/ZnO-Zn2SnO4 Nanoparticles

“…Several gas sensors based on SMOs such as zinc oxide (ZnO), zinc gallate (ZnGa 2 O 4 ), tin oxide (SnO 2 ), nickel cobaltite (NiCo 2 O 4 ), zinc stannate (Zn 2 SnO 4 ), copper oxide (CuO), etc., possess some good properties such as precision, low cost, small dimensions, long-term stability and environmental friendliness; because of these properties, SMOs could be considered the primary candidates for the detection of toxic gases as well in photo-catalysis, etc. [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Plenty of research has shown that some complex metal oxides have been widely used as gas sensors in the last decades.…”

NO2 Adsorption Sensitivity Adjustment of As/Sb Lateral Heterojunctions through Strain: First Principles Calculations

“…The sensitive materials useful for NO 2 sensors mainly contain nanomaterials, such as nanoparticles, nanowires and two-dimensional materials. For example, Ren et al constructed a ZnO-SnO 2 heterojunction to monitor the NO 2 centration, and the sensitivity of ZnO-SnO 2 heterojunctions is relatively highest at 180 • C [5]. In addition, Choi synthesized porous zinc oxide nanosheets using traditional solvothermal methods and verified their excellent response properties for NO 2 at 200 • C [6].…”