Hollow cubic ZnSnO3 with abundant oxygen vacancies for H2S gas sensing

Wang, Zheying; Miao, Jiayu; Zhang, Haixue; Wang, Dong; Sun, Jianbo

doi:10.1016/j.jhazmat.2020.122226

Cited by 54 publications

(18 citation statements)

References 34 publications

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“…Currently, various MOSs sensors have been employed to detect H 2 S due to its merits including low cost, fast response, and easy fabrication. − However, single MOSs gas sensors are difficult to match well with the actual requirement due to their rather high detection limit and low response . Therefore, the performance improvement of MOS-based sensors also has become the focus of people’s research. , Noble metals (such as Pd, Au, Rh, and Ru et al) in combination with MOSs always exhibit unique properties in the gas sensor fields owing to their specific chemical and electronic sensitization properties. − Moreover, some experiments have proved that noble metal/MOSs with high sensing performances could be easily designed by controlling the size, morphology, and dispersion of noble metals. ,− At present, the multielement system (includes two or more noble metals) is particularly attractive in the various fields (including biomedical diagnosis and therapy, energy storage and conversion, gas sensors and catalysis) because of material synergistic effects with unusual optical, electrical, chemical, and catalytic behaviors. ,− Among them, in the field of the gas sensor, bimetal can not only modulate the carrier concentration of the materials but also catalyze the reactions between detected gas molecules and surface-adsorbed oxygen species, which attracted more attention of the researchers.…”

Section: Introductionmentioning

confidence: 99%

High-Sensitive MEMS Hydrogen Sulfide Sensor made from PdRh Bimetal Hollow Nanoframe Decorated Metal Oxides and Sensitization Mechanism Study

Luo

Chen

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Here we report the fabrication of a high performance metal oxide semiconductor (MOS) sensor for the detection of hydrogen sulfide (H 2 S) using PdRh bimetal hollow nanocube (HC) with Rh-rich hollow frame and Pd−rich core frame as sensitizing materials. PdRh bimetal HC with the edge-length about 10 nm was prepared by chemical etching PdRh bimetal solid nanocube (SC) in HNO 3 aqueous solution. The results of gas-sensing tests indicate that the response value order of the MEMS gas sensors based on MOSs (including ZnO, MoO 3 and SnO 2 ) is as follows: R PdRh HC/MOS > R PdRh SC/MOS > R MOS . First, in the system of ZnO, gas sensor modified by PdRh (PdRh SC/ZnO and PdRh HC/ ZnO) possess enhanced H 2 S sensing performance with a better response and excellent lowconcentration detection capability (down to 15 ppb) comparing to pure ZnO. The improved H 2 S sensing performance could be attributed to the good conductivity of Rh−rich frame, the high catalytic activity of PdRh bimetal and formation of Schottky barrier-type junctions and defect. Second, PdRh HC/ZnO sensor shows better response (185-1 ppm of H 2 S) compared to PdRh SC/ZnO sensor (108-1 ppm of H 2 S), which is due to the higher specific surface area of PdRh HC/ZnO and good gas diffusion of the hollow structure. This work indicate that the sensitization characteristics of PdRh bimetal HC will provide new paradigms for the future development of the high performance sensor.

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Section: Introductionmentioning

confidence: 99%

High-Sensitive MEMS Hydrogen Sulfide Sensor made from PdRh Bimetal Hollow Nanoframe Decorated Metal Oxides and Sensitization Mechanism Study

Luo

Chen

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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“…The existence of carbon layer was further investigated by Raman spectrum of N–C/N–In 2 O 3 HS and N–In 2 O 3 HS. As shown in Figure S7, compared with N–In 2 O 3 HS, there are two prominent D (1361 cm –1 ) and G bands (1591 cm –1 ) in N–C/N–In 2 O 3 HS, which can be ascribed to the coated carbon layer. − In addition, the HRTEM image gave very clear interplanar distance with d -spacing of 0.189 nm, which matched well with the (222) plane of cubic In 2 O 3 . These results further confirmed that the phase of small particles was cubic In 2 O 3 .…”

Section: Resultsmentioning

confidence: 70%

Double Insurance of Continuous Band Structure and N–C Layer Induced Prolonging of Carrier Lifetime to Enhance the Long-Wavelength Visible-Light Catalytic Activity of N-Doped In₂O₃

Sun

Zeng

et al. 2020

Inorg. Chem.

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Nonmetallic doped metal oxides can be broad in their visible-light-response range. However, the half-filled or isolated impurity state can also be the new recombination center for photogenerated electrons/holes, which seriously influence the photocatalytic activity of the catalyst in the visible-light region. Therefore, how to prolong the photogenerated carrier life of nonmetallic doping metal oxides is the difficult and challenging topic in the field of photocatalysis. In this work, the hexagonal nanosheets assembled by N-doped C (N–C)-coated N-doped In2O3 (N–In2O3) nanoparticles (N–C/N–In2O3 HS) was obtained by simply pyrolyzing the In(2,5-PDC) hexagonal sheets. The N–C/N–In2O3 HS catalyst exhibit good photocatalytic activity and cycle stability in the long-wavelength region of visible light (λ = 520 and 595 nm). The effective utilization of long-wavelength visible light for N–C/N–In2O3 HS was mainly attributed to the acceptor–donor–acceptor compensation mechanism between the oxygen vacancy (VO) and substitutional N-doping (Ns) sites, which made the N–C/N–In2O3 HS possess a continuous band structure, without the half-filled or isolated impurity state in the band gap, and extended its light absorption edge to 733 nm. The compensation mechanism of nitrogen doping on In2O3 can promote the photocatalytic activity under longer-wavelength yellow light (595 nm) irradiation. The N–C layer coated on the N–In2O3 nanoparticles acted as a good acceptor of photogenerated electrons, facilitating the effective spatial separation of photogenerated carriers and extend photogenerated carrier lifetimes. The comparative photocatalytic experiments (N–In2O3 HS and N–C/N–In2O3 HS) show that the presence of N-doped C layer can enhance the photocatalytic efficiency by nearly 10-fold. This double-doping and carbon-coating strategy provided a novel research idea to solve the problem that nonmetal atoms doped metal oxides led to the secondary combination of photogenerated electrons/holes.

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“…Certain perovskite-type ternary compounds (ABO 3 ), such as ZnTiO 3 and ZnSnO 3 , exhibit efficient photocatalytic degradation of organic pollutants at room temperature. In particular, ZnSnO 3 , as a famous functional material, shows promising applications in photoelectrochemical devices [19], photocatalysts [20], and gas sensors [21]. Bi(III)-containing oxides have attracted much attention in the field of photocatalysis due to their better intrinsic properties and special layered structures [22,23] Although the ZnSnO 3 /ZnO composites have been successfully prepared, most of them are of irregular stacking morphology synthesized in two steps [26].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Dual Z-scheme Bi2MoO6/ZnSnO3/ZnO Heterostructure Photocatalyst for Efficient Visible Light Degradation of Organic Pollutants

Gao

et al. 2022

J Inorg Organomet Polym

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： An important means of achieving efficient charge separation and improving photocatalytic activity is the construction of heterostructures. In this study, the Bi 2 MoO 6 /ZnSnO 3 /ZnO heterostructure photocatalyst was synthesized by the hydrothermal method.The synthesized samples were carefully examined by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscopy (HR-TEM), photoluminescence (PL), and other analytical techniques.Meanwhile, the photocatalytic performance was further evaluated by multi-mode photocatalytic degradation with crystal violet (CV). The results show that the composite material has a relatively homogeneous cubic structure in size and shape. In the cubic structure, a heterogeneous structure exists between Bi 2 MoO 6 , ZnSnO 3 and ZnO. Simultaneously, the dramatic changes in physical morphology, such as the specific surface area and particle size of the composites, led to a unique set of properties, such as a significant climb in light absorption properties and superior photocatalytic activity. In addition, the Bi 2 MoO 6 /ZnSnO 3 /ZnO composite material shows lower photoluminescence intensity, smaller arc radius, and stronger photocurrent response compared to

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Hollow cubic ZnSnO3 with abundant oxygen vacancies for H2S gas sensing

Cited by 54 publications

References 34 publications

High-Sensitive MEMS Hydrogen Sulfide Sensor made from PdRh Bimetal Hollow Nanoframe Decorated Metal Oxides and Sensitization Mechanism Study

High-Sensitive MEMS Hydrogen Sulfide Sensor made from PdRh Bimetal Hollow Nanoframe Decorated Metal Oxides and Sensitization Mechanism Study

Double Insurance of Continuous Band Structure and N–C Layer Induced Prolonging of Carrier Lifetime to Enhance the Long-Wavelength Visible-Light Catalytic Activity of N-Doped In₂O₃

Preparation of Dual Z-scheme Bi2MoO6/ZnSnO3/ZnO Heterostructure Photocatalyst for Efficient Visible Light Degradation of Organic Pollutants

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Hollow cubic ZnSnO3 with abundant oxygen vacancies for H2S gas sensing

Cited by 54 publications

References 34 publications

High-Sensitive MEMS Hydrogen Sulfide Sensor made from PdRh Bimetal Hollow Nanoframe Decorated Metal Oxides and Sensitization Mechanism Study

High-Sensitive MEMS Hydrogen Sulfide Sensor made from PdRh Bimetal Hollow Nanoframe Decorated Metal Oxides and Sensitization Mechanism Study

Double Insurance of Continuous Band Structure and N–C Layer Induced Prolonging of Carrier Lifetime to Enhance the Long-Wavelength Visible-Light Catalytic Activity of N-Doped In2O3

Preparation of Dual Z-scheme Bi2MoO6/ZnSnO3/ZnO Heterostructure Photocatalyst for Efficient Visible Light Degradation of Organic Pollutants

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Double Insurance of Continuous Band Structure and N–C Layer Induced Prolonging of Carrier Lifetime to Enhance the Long-Wavelength Visible-Light Catalytic Activity of N-Doped In₂O₃