Transition metal elements-doped SnO2 for ultrasensitive and rapid ppb-level formaldehyde sensing. Issue 2 (February 2023)

• Record Type: Journal Article
• Authors: Han, Zejun; Tang, Yunxiang; Lu, Guixia; Qi, Yuan; Wu, Hao; Yang, Zhengyi; Han, Hecheng; Zhang, Xue; Wu, Lili; Wang, Zhou; Liu, Jiurong; Wang, Fenglong
• Is Part Of: Heliyon. Volume 9:Issue 2(2023)
• Publication Date: 2023-02
• Subjects: SnO2 -- Fe and Ni dopants -- Formaldehyde sensing -- Electronic structure -- Crystal structure -- Catalytic effect; Research -- Periodicals; Medical sciences -- Periodicals; Natural history -- Periodicals; Social sciences -- Periodicals; Earth sciences -- Periodicals; Physical sciences -- Periodicals; 507.2
• DOI: 10.1016/j.heliyon.2023.e13486
• Languages: English
• ISSNs: 2405-8440

Abstract

Abstract: Pristine SnO2, Fe-doped SnO2 and Ni-doped SnO2 were synthesized using facile hydrothermal method. Analysis based on XRD, TEM and UV–Vis DRS measurements demonstrated the successful insertion of Fe and Ni dopants into SnO2 crystal. Formaldehyde-detection measurements revealed that transition metal-doped SnO2 exhibited improved formaldehyde-sensing properties compared with that of pristine SnO2 . When the amount of incorporated dopant (Fe or Ni) was 4 at.%, the most effective enhancement on sensing performance of SnO2 was obtained. At 160 °C, the 4 at.% Fe–SnO2 and 4 at.% Ni–SnO2 exhibited higher response values of 7.52 and 4.37 with exposure to low-concentration formaldehyde, respectively, which were 2.4 and 1.4 times higher than that of pristine SnO2 . The change of electronic structure and crystal structure as well as catalytic effect of transition metals are chiefly responsible for the enhanced sensing properties. Graphical abstract: This work constructed transition metal elements-doped SnO2 with optimized electronic structure and crystal structure, which significantly enhanced the sensing performance towards low-concentration formaldehyde. Image 1