One-step synthesis of palladium oxide-functionalized tin dioxide nanotubes: Characterization and high nitrogen dioxide gas sensing performance at room temperature

Lei Teng; Yang Liu; Muhammad Ikram; Zhi Liu; Mohib Ullah; Laifeng Ma; Xueying Zhang; Hongyuan Wu; Li Li; Keying Shi

doi:10.1016/j.jcis.2018.11.001

One-step synthesis of palladium oxide-functionalized tin dioxide nanotubes: Characterization and high nitrogen dioxide gas sensing performance at room temperature

J Colloid Interface Sci. 2019 Mar 1:537:79-90. doi: 10.1016/j.jcis.2018.11.001. Epub 2018 Nov 2.

Authors

Lei Teng¹, Yang Liu¹, Muhammad Ikram¹, Zhi Liu¹, Mohib Ullah¹, Laifeng Ma¹, Xueying Zhang¹, Hongyuan Wu², Li Li³, Keying Shi⁴

Affiliations

¹ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education. School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China.
² College of Chemistry and Chemical Engineering, Qiqigar University, Qiqigar 161006, PR China.
³ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education. School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China; Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China. Electronic address: lili1993036@hlju.edu.cn.
⁴ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education. School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China. Electronic address: shikeying2008@163.com.

PMID: 30423491
DOI: 10.1016/j.jcis.2018.11.001

Abstract

Mesoporous palladium oxide (PdO)-functionalized tin dioxide (SnO₂) composite nanotubes (SPCTs) were prepared via one-step synthesis by electrospinning technology using ethanol and N,N-dimethylformamide (DMF) as solvents. Compared with pure SnO₂ nanotubes, there were abundant mesopores and multiheterojunctions in PdO-functionalized SnO₂ nanotubes. The sample with the molar ratio of SnO₂:PdO of 100:3 (3-SPCT) exhibited excellent response (∼20.30) as a sensor with fast gas response speed (∼1.33 s) to 100 ppm nitrogen dioxide (NO₂) at room temperature (RT), and the detection limit reached to 10 ppb. The improved gas sensing performance of the 3-SPCT sensor was mainly attributed to the synergistic effect: the unique SnO₂ tubular structure and well-dispersed mesopores provided the gas diffusion and adsorption channels, oxygen defects and chemisorbed oxygen were taken as the electron trap and charge transfer active sites, and a large number of heterojunctions acted as electron transport channels, thereby increasing the transfer rate.

Keywords: High porosity; Multiheterojunction; NO(2) gas sensor; PdO functionalization; SnO(2) nanotubes.