Detection of four alcohol homologue gases by ZnO gas sensor in dynamic interval temperature modulation mode

Meng, Fanli; Shi, Xue; Yuan, Zhenyu; Ji, Hanyang; Qin, Wenbo; Shen, Yanbai; Xing, Chaoyang

doi:10.1016/j.snb.2021.130867

Cited by 111 publications

(34 citation statements)

References 33 publications

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“…Intrinsic material property changes due to analyte adsorption and reactions of the sensing materials are the basis of many conductometric chemical sensors [1][2][3]. In gas sensing applications, most of the sensing materials tend to be metal oxides (MO, mostly II-VI semiconductors) due to their low cost, simple design and ease of production, short response time, wide detection range, and resistance to harsh working environments [4].…”

Section: Volatile Organic Compound (Voc) Detectionmentioning

confidence: 99%

“…With proper calibration, the S21 amplitude can be correlated to the total impedance of the GSG waveguide and gas-sensing device. Thus, we can use the S21 magnitude as an index to the changes in the MUT in response to an external perturbation, as shown by Equation (2), where ZΓ and Zo are the instantaneous and characteristic impedances of the device under test, respectively:…”

Section: Broadband Dielectric Spectroscopy (Bds) Backgroundmentioning

confidence: 99%

“…Furthermore, copper MOFs are widely used in MOF alcohol oxidation, due to the intrinsic activity of copper as an oxidizing catalyst [50]. The HKUST-1 MOF, [Cu3(BTC)2(H2O)3]n (where BTC is benzene-1,3,5-tricarboxylate), is composed of square Cu-Cu paddlewheel clusters connected by BTC ligands to form a rigid porous open framework with bimodal pore size distribution [51,52], and two-coordination unsaturated Cu [2] + metal sites (open metal sites) per paddlewheel where polar groups can attach through dative bonding [53]. The open metal sites, formed by removing axial ligands, strongly coordinate to electron-rich species (i.e., Lewis bases).…”

Section: Ethanol Vapor Detection With Pristine and Tcnq-loaded Hkust-...mentioning

confidence: 99%

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Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media

et al. 2022

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The most common gas sensors are based on chemically induced changes in electrical resistivity and necessarily involve making imperfect electrical contacts to the sensing materials, which introduce errors into the measurements. We leverage thermal- and chemical-induced changes in microwave propagation characteristics (i.e., S-parameters) to compare ZnO and surface-anchored metal–organic-framework (HKUST-1 MOF) thin films as sensing materials for detecting ethanol vapor, a typical volatile organic compound (VOC), at low temperatures. We show that the microwave propagation technique can detect ethanol at relatively low temperatures (<100 °C), and afford new mechanistic insights that are inaccessible with the traditional dc-resistance-based measurements. In addition, the metrological technique avoids the inimical measurand distortions due to parasitic electrical effects inherent in the conductometric volatile organic compound detection.

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Section: Volatile Organic Compound (Voc) Detectionmentioning

confidence: 99%

Section: Broadband Dielectric Spectroscopy (Bds) Backgroundmentioning

confidence: 99%

Section: Ethanol Vapor Detection With Pristine and Tcnq-loaded Hkust-...mentioning

confidence: 99%

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Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media

et al. 2022

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“…At present, zinc oxide (ZnO) is one of the most commonly used materials for application in gas sensors, catalysts and photocatalysts, phosphors, and piezoelectric and solar cells [ 1 , 2 ]. Regarding optimal parameters, metal oxides are known to have a uniform size of small nanocrystals and the required concentration of point defects that determine the surface activity.…”

Section: Introductionmentioning

confidence: 99%

Control over the Surface Properties of Zinc Oxide Powders via Combining Mechanical, Electron Beam, and Thermal Processing

et al. 2022

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The surface properties of zinc oxide powders prepared using mechanical activation, electron beam irradiation, and vacuum annealing, as well using combinations of these types of treatments, were studied using X-ray photoelectron spectroscopy. The structure of the obtained materials was studied by an X-ray diffraction technique and by scanning electron microscopy. We found that over five hours of grinding in an attritor, the size of nanocrystals decreases from 37 to 21 nm, and microdeformations increase from 0.3% to 0.6%. It was also found that a five-hour grinding treatment promoted formation of vacancies in the zinc sublattice at the surface and diffusion of Zn2+ cations into the bulk of the material. Irradiation of commercial zinc oxide powders with an electron beam with an energy of 0.9 MeV and a dose of 1 MGy induced breaking of Zn–O bonds, diffusion of interstitial zinc ions into the bulk, and oxygen atom escape from regular positions into the gas phase. A combined treatment of five hours of grinding and electron beam irradiation promoted accumulation of interstitial zinc ions at the surface of the material. Annealing of both initial and mechanically activated ZnO powders at temperatures up to 400 °C did not lead to a significant change in the properties of the samples. Upon exceeding the 400 °C annealing temperature the X-ray photoelectron spectra show almost identical atomic composition of the two types of materials, which is related to diffusion of interstitial zinc ions from the bulk of the material to the surface.

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“…Over the past decades, the IPA sensors derived from semiconducting metal oxides (MOS: SnO 2 , TiO 2 , ZnO, etc.) have become a valuable choice due to their advantages of acceptable sensitivity, good compatibility, and affordable cost. − Nevertheless, their operating temperature is usually high (100–400 °C) due to their low-efficiency electron transfer at RT. In order to develop gas sensors with high performance at RT, researchers have gradually paid more attention to two-dimensional (2D) materials .…”

Section: Introductionmentioning

confidence: 99%

Moisture-Resistant Gas Sensor Derived from ZIF-8/Layered Double Hydroxide/Ti₃C₂T_x Nanocomposites for Trace Isopropanol Detection

Qin

Gui

Bai

et al. 2022

ACS Appl. Nano Mater.

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Layered double hydroxides (LDHs) are recently gaining scientific attention in the gas sensor field. However, the general layer-stacking of two-dimensional (2D) materials significantly limits the performance of LDHs-based gas sensors due to the resulting reduction of gas-active sites. To address the issue, we designed and successfully constructed a nanocomposite of ZIF-8/ LDHs/Ti 3 C 2 T x via a sequential induced growth of LDHs and ZIF-8 on the 2D Ti 3 C 2 T x nanosheets. The achieved ZIF-8/LDHs/ Ti 3 C 2 T x nanocomposite exhibits the uniform coverage of hexagonal ZIF-8 particles on LDHs/Ti 3 C 2 T x . In the nanocomposite, the ZIF-8 particles grown with Zn atoms in LDHs as the core sites form a tight ternary heterostructure with LDHs and Ti 3 C 2 T x , and a two-dimensional electron gas (2DEG) region with high conductivity is generated during an isopropanol (IPA)sensing process. Benefiting from the modification of ZIF-8 and the generation of 2DEG, the gas adsorption sites and effective conductive pathway are prominently increased, which is crucial for the improvement of gas-sensing performance. Resultantly, the asfabricated ZIF-8/LDHs/Ti 3 C 2 T x sensor can detect rarefied IPA at the sub-ppm level with a theoretical limit of detection of 9 ppb; it shows a response value of 61.82 toward 50 ppm IPA at room temperature (RT), which is about 27 times boost in contrast to LDHs/ Ti 3 C 2 T x . Notably, the ZIF-8/LDHs/Ti 3 C 2 T x sensor still shows a significant response (5.12) toward 2.5 ppm IPA under high relative humidity (85 %RH) at RT. The gas-sensing mechanism was clarified from the heterostructure effect, adsorption energy calculation, and morphology promotion. Above all, this research provides a route to explore the application potential of LDHs-based nanocomposites in both atmospheric and breath IPA detection.

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Detection of four alcohol homologue gases by ZnO gas sensor in dynamic interval temperature modulation mode

Cited by 111 publications

References 33 publications

Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media

Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media

Control over the Surface Properties of Zinc Oxide Powders via Combining Mechanical, Electron Beam, and Thermal Processing

Moisture-Resistant Gas Sensor Derived from ZIF-8/Layered Double Hydroxide/Ti₃C₂T_x Nanocomposites for Trace Isopropanol Detection

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Detection of four alcohol homologue gases by ZnO gas sensor in dynamic interval temperature modulation mode

Cited by 111 publications

References 33 publications

Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media

Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media

Control over the Surface Properties of Zinc Oxide Powders via Combining Mechanical, Electron Beam, and Thermal Processing

Moisture-Resistant Gas Sensor Derived from ZIF-8/Layered Double Hydroxide/Ti3C2Tx Nanocomposites for Trace Isopropanol Detection

Contact Info

Product

Resources

About

Moisture-Resistant Gas Sensor Derived from ZIF-8/Layered Double Hydroxide/Ti₃C₂T_x Nanocomposites for Trace Isopropanol Detection