High-sensitivity and high-selectivity detection of methanol based on La-doped SnO 2 sensor
- PDF / 2,953,902 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 24 Downloads / 248 Views
High‑sensitivity and high‑selectivity detection of methanol based on La‑doped SnO2 sensor Yu Chen1,2 · Zegang Dong1 · Xinxin Xue1 · Song Chen3 · Avi Natan4 · Yu Lv1 · Cheng Chen1 · Yinye Yang1 · Weifu Cen1 · Yang Yang1 Received: 5 January 2020 / Accepted: 19 March 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Pure SnO2 and La-doped SnO2 nanocomposite were prepared through hydrothermal method, and their gas sensing performances were studied. Results indicate that the sensing response of the 5 wt% La-doped S nO2 nanocomposite reached 29.5 when exposed to 75 ppm methanol at the optimal operating temperature of 220 °C, which was over seven times larger than that of pure SnO2 nanoparticles. In addition, the response and recovery time were shortened to 12 s and 7 s, respectively. Moreover, the 5 wt% La-doped SnO2 nanocomposite presents a good selectivity toward methanol among methanal, methanol, ammonia, acetone and benzene gases. The improvement in the gas sensing properties of the 5 wt% La-doped S nO2 nanocomposite toward methanol can be attributed to the smaller crystallite size, larger surface area and the modified chemical nature of nanocomposite surface. Keywords La-doped · SnO2 · Nanoparticles · Methanol · Gas sensor
1 Introduction Methanol is an important chemical reagent with widespread industrial applications, such as dyes, perfumes, colors and power sources [1]. However, methanol is highly toxic for human health, which can permeate human body through inhalation and skin absorption, and then inevitably lead to terrible illness, such as headaches, metabolic acidosis or even blindness at levels below the odor threshold (odor threshold is 0.5–1.0 ppm) [2]. In addition, as an important Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-03478-6) contains supplementary material, which is available to authorized users. * Yang Yang [email protected] 1
School of Materials Science and Engineering, Guizhou Minzu University, Guiyang 550025, Guizhou, China
2
Department of Chemical Engineering and Safety, Binzhou University, Binzhou 256600, Shandong, China
3
College of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China
4
Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA
precursor of CO and O 3, excess of methanol will cause serious of environment concerns. Therefore, the fast and accurate detection of methanol in the environment is crucial. Gas chromatography and mass spectrometry are the classical methods and powerful techniques that used to detect methanol for decades. Disappointingly, these traditional methods are not used for in situ detection because their measurements need expensive and complicated instruments [3]. Recently, utilization of gas sensors has been found to be an efficient and satisfactory way to detect various volatile organic compounds (VOCs) gases due to the high sensitivity, selectivity
Data Loading...
