Oxygen Vacancies Enhance Triethylamine Sensing Properties of SnO₂ Nanoparticles

Abstract

In this paper, tin oxide (SnO2) nanoparticles with abundant oxygen vacancies (OVs) (designated as IWBT) were synthesized via a combined hydrothermal route and ice‐water bath stirring method. In addition, another SnO2 nanoparticles (designated as RTT) were prepared by the room temperature stirring synthesis and subsequent hydrothermal process. The morphology and composition of the as‐obtained samples were characterized by X‐ray diffraction (XRD), field‐emission scanning electron microscopy (FESEM), X‐ray photoelectron spectroscopy (XPS) and Brunauer‐Emmett‐Teller (BET) analysis. It was found that IWBT contained much more surface oxygen vacancies defects than RTT. The synthesized IWBT exhibited outstanding gas sensing properties toward triethylamine (TEA) at 260 °C, such as high response, significant selectivity, low detection limit and excellent repeatability. According to the results of experiments, the response of as‐prepared IWBT sensor could reach to 2701.36 when exposed to 500 ppm TEA, which was far higher than the as‐prepared RTT sensor (748.10). The excellent sensing characteristics of IWBT could be attributed to the abundant OVs that could improve the O2 adsorptivity and electron transfer capability of SnO2. Thus, IWBT supplied a rational strategy to enhance the gas sensing performances of TEA gas sensors.

Enhanced Acetaldehyde Sensing Performance of Spherical Shaped Copper Doped ZnO Nanostructures

“…Consequently, the sensor's response depends on both the net change in hole concentration and the width of the depletion region. [44][45][46][47][48][49][50][51][52][53][54][55][56][57] After acetaldehyde gas sensing change in morphology of CZ9 sensor After gas sensing study, FE-SEM was done to understand if there was any change in the CZ9 sensor morphology. Figure 9 shows slight distortion in morphology of CZ9 sensor.…”

“…Thus, the increased depletion width at the CuO/ZnO interface and the decreased number of CuO holes caused an increase in resistance. Consequently, the sensor‘s response depends on both the net change in hole concentration and the width of the depletion region [44–57] …”

Atomically Dispersed Pt on Three-Dimensional Ordered Macroporous SnO2 for Highly Sensitive and Highly Selective Detection of Triethylamine at a Low Working Temperature

“…Because of the excellent conductivity and permeability of the hollow fiber-like SnO 2 , the sensor exhibited a high response and a limit of detection of 2 ppm to TEA at 270 °C . Because of the high oxygen absorption and electron transferability, the SnO 2 nanoparticles synthesized by Wang et al exhibited a high response of 431 to 100 ppm TEA at 260 °C . Xu et al prepared SnO 2 nanorods, which had more active sites and exhibited a high response to TEA at 120 °C .…”

“…7 Because of the high oxygen absorption and electron transferability, the SnO 2 nanoparticles synthesized by Wang et al exhibited a high response of 431 to 100 ppm TEA at 260 °C. 17 Xu et al prepared SnO 2 nanorods, which had more active sites and exhibited a high response to TEA at 120 °C. 18 Recently, three-dimensional ordered macroporous (3DOM) sensing materials have attracted much attention.…”

Visual Detection of Triethylamine and a Dual Input/Output Logic Gate Based on a Eu3+-Complex

“…In suitable cases, by regulating the energy of the ligand and the outer stimulations, the energy transfer between the ligands and the Ln-metal centers can be controlled, leading the emission to be “Off-On”, or leading to a change in color and intensity [ 20 ], which leads to the emission becoming a favorable and promising candidate for visual detection [ 21 , 22 ]. Furthermore, the detection of toxic triethylamine (TEA) [ 23 ] possesses a direct relevance to the quality of the environment and our lives and is highly demanding [ 24 ]. However, the development of stimuli-responsive systems that show a wide range of luminescent color changes for sensitive and eye-catching observations upon TEA stimulations are still worth studying [ 17 , 25 , 26 ].…”