Comparison of Au-functionalized semiconductor metal oxides in sensitivity to VOC

Marikutsa, Artem; Novikova, A. A.; Rumyantseva, M. N.; Khmelevsky, Nikolay; Gaskov, Alexander

doi:10.1016/j.snb.2020.128980

Cited by 35 publications

(32 citation statements)

References 38 publications

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“…In the following sections, these relationships are reviewed based on our experimental studies of nanocrystalline n-type MOS: ZnO, In 2 O 3 , SnO 2 , BaSnO 3 , TiO 2 , WO 3 , Bi 2 WO 6 . The materials were synthesized via the standardized aqueous precipitation of metal hydroxides followed by calcination at temperature 300-700 • C [63,[74][75][76][77][78]. observation of actual reactivity of surface sites under in situ reaction conditions is an unresolved problem; and the above definition refers to a potential participation of certain types of active sites in real-life chemical reactions that determine the functionality of catalytic and sensing materials.…”

Section: Types Of Active Sites At the Mos Surfacementioning

confidence: 99%

Section: Types Of Active Sites At the Mos Surfacementioning

confidence: 99%

“…In Table 2, we summarized the concentrations of active sites determined in our works on n-type simple MOS (ZnO, SnO 2 , TiO 2 , WO 3 ) with different phase compositions and microstructure parameters, and mixed-metal oxides (BaSnO 3 , Bi 2 WO 6 ). The simple MOS were synthesized by aqueous deposition of metal hydroxides with subsequent annealing at temperature 300-700 • C. Mixed-metal oxides were obtained by co-precipitation of metal hydroxides and hydrothermal treatment with subsequent annealing at 300-500 • C. The materials consisted of phase-pure nanocrystalline wurtzite-like ZnO, rutile-like SnO 2 , monoclinic γ-WO 3 , cubic perovskite-like BaSnO 3 , and Aurivillius phase Bi 2 WO 6 with the crystallite size in the range d XRD = 3-50 nm and specific surface area 4-100 m 2 /g (Table 2) [63,[74][75][76][77][78]. Mixed-phase TiO 2 with the rutile:anatase ratio of 3:2 was obtained after calcination at 700 • C [78].…”

Section: Active Sites Concentrations At the Surface Of Nanocrystallinmentioning

confidence: 99%

“…The principles and procedures of the active sites determination are described in the Appendix A. 4 No data for TPD from In2O3 annealed at 300 °C because of ammonia oxidation caused by residual nitrate species [78,97].…”

Section: Active Sites Concentrations At the Surface Of Nanocrystallinmentioning

confidence: 99%

“…Acid sites were determined by TPD of ammonia [63,75,78,79,98]. Desorption patterns are shown in Figure 11a.…”

Section: Acid Sitesmentioning

confidence: 99%

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The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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Development of sensor materials based on metal oxide semiconductors (MOS) for selective gas sensors is challenging for the tasks of air quality monitoring, early fire detection, gas leaks search, breath analysis, etc. An extensive range of sensor materials has been elaborated, but no consistent guidelines can be found for choosing a material composition targeting the selective detection of specific gases. Fundamental relations between material composition and sensing behavior have not been unambiguously established. In the present review, we summarize our recent works on the research of active sites and gas sensing behavior of n-type semiconductor metal oxides with different composition (simple oxides ZnO, In2O3, SnO2, WO3; mixed-metal oxides BaSnO3, Bi2WO6), and functionalized by catalytic noble metals (Ru, Pd, Au). The materials were variously characterized. The composition, metal-oxygen bonding, microstructure, active sites, sensing behavior, and interaction routes with gases (CO, NH3, SO2, VOC, NO2) were examined. The key role of active sites in determining the selectivity of sensor materials is substantiated. It was shown that the metal-oxygen bond energy of the MOS correlates with the surface acidity and the concentration of surface oxygen species and oxygen vacancies, which control the adsorption and redox conversion of analyte gas molecules. The effects of cations in mixed-metal oxides on the sensitivity and selectivity of BaSnO3 and Bi2WO6 to SO2 and VOCs, respectively, are rationalized. The determining role of catalytic noble metals in oxidation of reducing analyte gases and the impact of acid sites of MOS to gas adsorption are demonstrated.

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Section: Types Of Active Sites At the Mos Surfacementioning

confidence: 99%

Section: Types Of Active Sites At the Mos Surfacementioning

confidence: 99%

Section: Active Sites Concentrations At the Surface Of Nanocrystallinmentioning

confidence: 99%

Section: Active Sites Concentrations At the Surface Of Nanocrystallinmentioning

confidence: 99%

“…Acid sites were determined by TPD of ammonia [63,75,78,79,98]. Desorption patterns are shown in Figure 11a.…”

Section: Acid Sitesmentioning

confidence: 99%

See 3 more Smart Citations

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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Handheld Device for Selective Benzene Sensing over Toluene and Xylene

et al. 2021

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More than 1 million workers are exposed routinely to carcinogenic benzene, contained in various consumer products (e.g., gasoline, rubbers, and dyes) and released from combustion of organics (e.g., tobacco). Despite strict limits (e.g., 50 parts per billion (ppb) in the European Union), routine monitoring of benzene is rarely done since low-cost sensors lack accuracy. This work presents a compact, battery-driven device that detects benzene in gas mixtures with unprecedented selectivity (>200) over inorganics, ketones, aldehydes, alcohols, and even challenging toluene and xylene. This can be attributed to strong Lewis acid sites on a packed bed of catalytic WO 3 nanoparticles that prescreen a chemoresistive Pd/SnO 2 sensor. That way, benzene is detected down to 13 ppb with superior robustness to relative humidity (RH, 10-80%), fulfilling the strictest legal limits. As proof of concept, benzene is quantified in indoor air in good agreement (R 2 ≥ 0.94) with mass spectrometry. This device is readily applicable for personal exposure assessment and can assist the implementation of low-emission zones for sustainable environments.

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Nanomaterial‐Based Electrochemical Sensors: Mechanism, Preparation, and Application in Biomedicine

Liu

Huang

Qian

2021

Advanced NanoBiomed Research

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Nanomaterials possess unique properties, including excellent electrochemical properties, high surface area, and tunable electric conductivity, making them attractive for sensing applications, especially for electrochemical sensing. Notably, the compatibility of nanomaterials with other techniques opens up opportunities for electrochemical sensors in various biomedical applications. Herein, the enhancing mechanisms and preparation protocols of electrochemical sensors, regarding the material choices, are introduced. The integration of nanomaterial‐based electrochemical sensors with other techniques toward precise health management and controlled drug release is further highlighted. It is concluded with perspectives on the future directions for this topic. Future research directions of nanomaterial‐based electrochemical sensors and the challenges faced by commercialized implementation of the sensors are presented, paving the way for the upcoming era of accurate biosensing toward both academic and industrial use.

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Comparison of Au-functionalized semiconductor metal oxides in sensitivity to VOC

Cited by 35 publications

References 38 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Handheld Device for Selective Benzene Sensing over Toluene and Xylene

Nanomaterial‐Based Electrochemical Sensors: Mechanism, Preparation, and Application in Biomedicine

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