Platinum single atoms on tin oxide ultrathin films for extremely sensitive gas detection

Xu, Yi; Zheng, Wei; Liu, Xianghong; Zhang, Liqiang; Zheng, Lingli; Yang, Chen; Pinna, Nicola; Zhang, Jun

doi:10.1039/d0mh00495b

Cited by 221 publications

(126 citation statements)

References 39 publications

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“…At present, the sensing mechanism of noble metal NPs or noble metal oxide particles modified SMOs has been extensively reported, and there are two main mechanisms that are widely accepted, that is Fermi‐level control [ 36,37 ] and oxygen spill‐over mechanism. [ 38,39 ] However, as the noble catalyst size reduced to atomic scale, because the electronic property of metal catalyst will change dramatically, it probably leads to variations in the sensing mechanism, which will be different from aforementioned acceptable mechanisms. But there are very few reports on the sensing mechanism of catalyst regulation at single atomic scale so far.…”

Section: Resultsmentioning

confidence: 99%

The Dehydrogenation of H‐S Bond into Sulfur Species on Supported Pd Single Atoms Allows Highly Selective and Sensitive Hydrogen Sulfide Detection

Liu

Zhang

Luo

et al. 2021

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The supported metal catalysts on scaffolds usually reveal multiple active sites, resulting in the occurrence of side reaction and being detrimental to the achievement of highly consistent catalysis. Single atom catalysts (SACs), possessed with highly consistent single active sites, have great potentials for overcoming such issues. Herein, the authors used SACs to modulate kinetic process of gas sensitive reaction. The supported Pd SACs, established by a metal organic frameworks‐templated approach, promoted greatly the detection capacity to hydrogen sulfide (H2S) gas with a very high sensitivity and selectivity. Density functional theory calculations show that the supported Pd SACs not only increased the number of electrons transferring from H2S molecules to Pd SACs, but strengthened surface affinity to H2S. Moreover, the HS bonds of H2S molecules absorbed on Pd atomic sites are more likely to be dehydrogenated directly into sulfur species. Significantly, quasi in situ XPS analysis confirmed the presence of sulfur species during H2S detection process, which may be a major cause for such detection signal. Based on these results, a suitable sensing principle for H2S gas driven by Pd SACs was put forward. This work will enrich catalytic electronics in chemiresistive gas sensing.

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Section: Resultsmentioning

confidence: 99%

The Dehydrogenation of H‐S Bond into Sulfur Species on Supported Pd Single Atoms Allows Highly Selective and Sensitive Hydrogen Sulfide Detection

Liu

Zhang

Luo

et al. 2021

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“…It essentially depends on the chemisorption reactions between acetone molecules and adsorbed active ions on the sensor surface, which cause a change in the charge depletion layer and regulate the change in resistance [ 46 , 47 ]. The interaction of oxygen molecules with the ZnS QDs sensor surface and ionic active site formation are summarized in Equations (5)–(7) [ 46 , 47 , 48 , 49 ].

…”

Section: Resultsmentioning

confidence: 99%

ZnS Quantum Dot Based Acetone Sensor for Monitoring Health-Hazardous Gases in Indoor/Outdoor Environment

Mishra

Choi

et al. 2021

Micromachines

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This study reports the ZnS quantum dots (QDs) synthesis by a hot-injection method for acetone gas sensing applications. The prepared ZnS QDs were characterized by X-ray diffraction (XRD) and transmission electron microscopy analysis. The XRD result confirms the successful formation of the wurtzite phase of ZnS, with a size of ~5 nm. Transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and fast Fourier transform (FFT) images reveal the synthesis of agglomerated ZnS QDs with different sizes, with lattice spacing (0.31 nm) corresponding to (111) lattice plane. The ZnS QDs sensor reveals a high sensitivity (92.4%) and fast response and recovery time (5.5 s and 6.7 s, respectively) for 100 ppm acetone at 175 °C. In addition, the ZnS QDs sensor elucidates high acetone selectivity of 91.1% as compared with other intrusive gases such as ammonia (16.0%), toluene (21.1%), ethanol (26.3%), butanol (11.2%), formaldehyde (9.6%), isopropanol (22.3%), and benzene (18.7%) for 100 ppm acetone concentration at 175 °C. Furthermore, it depicts outstanding stability (89.1%) during thirty days, with five day intervals, for 100 ppm at an operating temperature of 175 °C. In addition, the ZnS QDs acetone sensor elucidates a theoretical detection limit of ~1.2 ppm at 175 °C. Therefore, ZnS QDs can be a promising and quick traceable sensor nanomaterial for acetone sensing applications.

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“…A large number of studies have shown that temperature and air flow rate have a great influence on the intensity of CTL [22][23][24][25][26][27]. Therefore, under the condition of keeping other conditions unchanged, we investigated the CTL intensity of trichloroethylene on the surface of PEG200/ZnO nanocomposite at different temperatures and air flow rate in order to obtain better response conditions, the specific results are shown in Fig.…”

Section: Effect Of Working Temperature Air Flow Rate and Analyte Conmentioning

confidence: 99%

A cataluminescence sensor for the detection of trichloroethylene based on PEG200/ZnO nanocomposite

et al. 2020

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The content of volatile organic compounds (VOCs) in the atmosphere will endanger the health and safety of human beings which makes it very important to develop a simple and rapid method for the determination of gas pollutants. Based on this, a new type of gas sensor was proposed for the detection of trichloroethylene in air. PEG200/ZnO nanocomposite were prepared by hydrothermal method. The materials were characterized by scanning electron microscope, X-ray energy spectrum and fourier infrared spectrum. The high selectivity of the materials was verified by using the cataluminescence (CTL) intensity of 9 kinds of VOCs on the surface of the materials as a reference. The results show that trichloroethylene can produce CTL response on the surface of PEG200/ZnO nanocomposite. Temperature, air flow rate and detector concentration all have certain effects on the CTL intensity. By comparing the CTL intensity under different reaction conditions, it is found that the suitable temperature and air flow rate are 120 °C, 180 mL/min and there is a good linear relationship between the relative CTL intensity and the concentration of the detected substance (y = 28.588 x - 285.56, R=0.9593). The gas sensor has the advantage of rapid response, and trichloroethylene can produce the maximum CTL on the surface of the material within 3 ~ 5 s.

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Platinum single atoms on tin oxide ultrathin films for extremely sensitive gas detection

Abstract: Single atom Pt significantly improves the sensing performances of ultrathin SnO2 films for detection of triethylamine.

Cited by 221 publications

References 39 publications

The Dehydrogenation of H‐S Bond into Sulfur Species on Supported Pd Single Atoms Allows Highly Selective and Sensitive Hydrogen Sulfide Detection

The Dehydrogenation of H‐S Bond into Sulfur Species on Supported Pd Single Atoms Allows Highly Selective and Sensitive Hydrogen Sulfide Detection

ZnS Quantum Dot Based Acetone Sensor for Monitoring Health-Hazardous Gases in Indoor/Outdoor Environment

A cataluminescence sensor for the detection of trichloroethylene based on PEG200/ZnO nanocomposite

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