Facile synthesis of ZnO morphological evolution with tunable growth habits: Achieving superior gas-sensing properties of hemispherical ZnO/Au heterostructures for triethylamine

Ma, Qian; Fang, Yuan; Liu, Yu; Song, Junchao; Fu, Xiao; Li, Hui; Chu, Shushu; Chen, Ying

doi:10.1016/j.physe.2018.10.039

Cited by 23 publications

(9 citation statements)

References 30 publications

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“…Metal oxide semiconductor (MOS)-based gas sensors have been used extensively to detect hazardous gases because of their low cost, small size, high preparation flexibility, and the ability to detect multiple gases [7,8]. The typical n-type semiconductor ZnO is considered to be an extremely beneficial gas-sensing material by reason of good chemical stability, non-toxicity, high surface-to-volume ratio, suitable doping, and low cost [9,10,11]. It is worth noting that the fabrication of heterostructure composite sensors can enhance gas-sensing performances and significantly improve the low sensitivity and poor selectivity of pure ZnO materials [12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Co3O4/ZnO Hybrid Nanoparticles for Triethylamine Detection

Yang

Wang

et al. 2019

Nanomaterials

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Development of high performances gas sensors to monitor and detect the volatile organic compound triethylamine is of paramount importance for health and environmental protection. The Co3O4-ZnO nanoparticles composite was successfully synthesized by the one-step hydrothermal route and annealing process in this work. The gas sensitivity test results show that the composite exhibits excellent triethylamine-sensing performance at a cobalt content of 1 at%, indicating potential application for triethylamine detection. The sensor based on the Co3O4-ZnO composite had higher sensitivity to triethylamine, better selectivity, and faster response recovery rate compared with pure ZnO sensor. Combined with the structural characteristics of the characterized Co3O4-ZnO nanocomposite, the optimized triethylamine sensing performances can be ascribed to the p-n heterojunction effect between Co3O4 and ZnO, as well as the catalytic and high oxygen adsorption properties of Co3O4.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Co3O4/ZnO Hybrid Nanoparticles for Triethylamine Detection

Yang

Wang

et al. 2019

Nanomaterials

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“…The N 1 s electron binding state peak can be fitted into three peaks with the centers of 398.9 eV, 399.9 eV and 400.2 eV, as shown in Fig. 5c, in which the peak at 398.9 eV is attributed to the sp 2 -bonded carbon triazine rings (C = N-C) in the ring structure, and the peaks at 399.9 eV and 400.2 eV are attributed to the tertiary nitrogen bonded to carbon atoms (N-(C) 3 ) and amino groups (C-N-(H) 2 ), respectively [30,31]. Figure 5d shows the O 1 s electron binding state in the ZO/CN-3 sample, in which the O 1 s binding energy can also be fitted into three peaks of 530.15 eV, 531.27 eV and 532.49 eV, corresponding to the lattice oxygen of ZnO (O 2− ions), V O defects and chemisorbed oxygen (H 2 O, O 2 , OH − , etc.…”

Section: Resultsmentioning

confidence: 90%

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

Liu

et al. 2021

Appl. Phys. A

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ZnO nanorods/g-C 3 N 4 photocatalytic composite was prepared, and its structural and optical properties have been studied. Bulk graphite phase carbon nitride (g-C 3 N 4 ) was first prepared by a one-step thermal polymerization method, and ZnO nanorods were grown from the ZnO seed particles on the surface of g-C 3 N 4 by a hydrothermal method. The effects of hydrothermal reaction time on the morphology and photocatalytic properties of ZnO nanorods/g-C 3 N 4 composite were investigated. The hydrothermal reaction included two stages. The initial stage was dominated by the rapid deposition of Zn 2+ precursor in hydrothermal solution on ZnO seed particles to form ZnO seed layer, and the second stage was the hydrothermal growth of ZnO nanorods from the ZnO seed layer. In the second stage, two processes occurred simultaneously, namely, the dissolution of seed layer and the growth of ZnO nanorods. Hence, the composite prepared with different hydrothermal time shows different photocatalytic degradation mechanism to methyl orange (MO) solution. The photocatalytic performance of the composite sample with the grown time of 2 h is mainly attributed to separation efficiency of photogenerated carriers. For the composite sample with the grown time of 3 h, due to the partial dissolution of seed layer, its photocatalytic performance is mainly attributed to the surface reaction of ZnO nanorods. For the composite samples with the hydrothermal grown time of 4 and 5 h, the dense ZnO nanorods on the surface of g-C 3 N 4 improve the separation efficiency of the photogenerated carriers, and their photocatalytic performance is attributed to both carrier lifetime and surface reaction. As a result of synergy, the sample with the hydrothermal grown time of 3 h shows the best photocatalytic performance in all composite sample. KeywordsZnO nanorods • g-C 3 N 4 composites • Hydrothermal • Photocatalysis * Fucheng Yu

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“…In the case of S3 (0.3 wt % Au-loaded LaFeO 3 ) in Figure 10 (2(a,b)), the acetone sensing mechanism follows the same process as that on the pure LaFeO 3 ; however, the electronic and chemical sensitization of the Au nanoparticles promotes enhancement in the sensing performance of the LaFeO 3 NB-based sensor. 82 The significant enhancement in the sensing performance of S3 may be explained as follows:Au is a good catalyst for oxygen dissociation, 83 which means that Au nanoparticles aid in ease of oxygen molecule adsorption and the capture of electrons to produce active oxygen adsorbates (Figure 10(2a)). Further, acetone molecules are ionized to active radicals by the Au nanoparticles and due to the spill-over effect of Au, these active radicals spill over the surface of LaFeO 3 , facilitating the sensing reactions on the surface of LaFeO 3 , thus enhancing the response and also fast-tracking response and recovery times.The surface area and pore diameter increased with Au loading, as confirmed from BET analysis, and this can provide more surface adsorption sites to adsorb oxygen and acetone molecules and also ease in diffusion, hence the improved gas-sensing response.The 1D NB morphology of LaFeO 3 also plays an important role as it allows overlapping of the hole accumulation layers along the NB direction resulting in continuous hole transfer channels, thus contributing to enhancement of the sensor performance.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast Detection of Low Acetone Concentration Displayed by Au-Loaded LaFeO₃ Nanobelts owing to Synergetic Effects of Porous 1D Morphology and Catalytic Activity of Au Nanoparticles

2019

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Herein, we report on one-dimensional porous Au-modified LaFeO3 nanobelts (NBs) with high surface area, which were synthesized through the electrospinning method. The incorporation and coverage of Au nanoparticles (NPs) on the surface of the LaFeO3 NBs was achieved by adjusting the HAuCl amount in the precursor solution. Successful incorporation of Au NPs was examined by X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The gas-sensing performance of both the pure and Au/LaFeO3 NB-based sensors was tested toward 2.5–40 ppm of acetone at working temperatures in the range from room temperature to 180 °C. The gas-sensing findings revealed that Au/LaFeO3 NB-based sensor with the Au concentration of 0.3 wt % displayed improved response of 125–40 ppm of acetone and rapid response and recovery times of 26 and 20 s, respectively, at an optimal working temperature of 100 °C. Furthermore, all sensors demonstrated an excellent response toward acetone and remarkable selectivity against NO2, NH3, CH4, and CO. Hence, the Au/LaFeO3-NB-based sensor is a promising candidate for sensitive, ultrafast, and selective acetone detections at low concentrations. The gas-sensing mechanism of the Au/LaFeO3 sensors is explained in consideration of the catalytic activity of the Au NPs, which served as direct adsorption sites for oxygen and acetone.

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Facile synthesis of ZnO morphological evolution with tunable growth habits: Achieving superior gas-sensing properties of hemispherical ZnO/Au heterostructures for triethylamine

Cited by 23 publications

References 30 publications

Hydrothermal Synthesis of Co3O4/ZnO Hybrid Nanoparticles for Triethylamine Detection

Hydrothermal Synthesis of Co3O4/ZnO Hybrid Nanoparticles for Triethylamine Detection

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

Ultrafast Detection of Low Acetone Concentration Displayed by Au-Loaded LaFeO₃ Nanobelts owing to Synergetic Effects of Porous 1D Morphology and Catalytic Activity of Au Nanoparticles

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Facile synthesis of ZnO morphological evolution with tunable growth habits: Achieving superior gas-sensing properties of hemispherical ZnO/Au heterostructures for triethylamine

Cited by 23 publications

References 30 publications

Hydrothermal Synthesis of Co3O4/ZnO Hybrid Nanoparticles for Triethylamine Detection

Hydrothermal Synthesis of Co3O4/ZnO Hybrid Nanoparticles for Triethylamine Detection

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

Ultrafast Detection of Low Acetone Concentration Displayed by Au-Loaded LaFeO3 Nanobelts owing to Synergetic Effects of Porous 1D Morphology and Catalytic Activity of Au Nanoparticles

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Ultrafast Detection of Low Acetone Concentration Displayed by Au-Loaded LaFeO₃ Nanobelts owing to Synergetic Effects of Porous 1D Morphology and Catalytic Activity of Au Nanoparticles