A facile one-step hydrothermal synthesis of NiO/ZnO heterojunction microflowers for the enhanced formaldehyde sensing properties

San, Xiaoguang; Li, Ming; Liu, Dongyu; Wang, Guosheng; Shen, Yanbai; Meng, Dan; Meng, Fanli

doi:10.1016/j.jallcom.2017.12.168

Cited by 103 publications

(23 citation statements)

References 54 publications

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“…The detailed sensing mechanism and the surface reaction of the 3D n -ZnO/ p -NiO based sensor were depicted in Figure 12 . When the as-prepared 3D n -ZnO/ p -NiO sensor is exposed to air Figure 12 a, the highly electronegative of oxygen molecules could be easily absorbed on the surface of sensing material by trapping free electrons, and then form different chemisorbed oxygen species (O − in this experiment) under the various working temperatures (including O 2 − (T < 100 °C), O − (100 < T < 300 °C), and O 2− (T > 300 °C) [ 44 , 45 ]. The loss of electrons will lead to a depletion layer and significantly increased resistance on the surface of n -type ZnO.…”

Section: Resultsmentioning

confidence: 99%

NH3 Sensor Based on 3D Hierarchical Flower-Shaped n-ZnO/p-NiO Heterostructures Yields Outstanding Sensing Capabilities at ppb Level

Zhao

Yang

Wei

et al. 2020

Sensors

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Hierarchical three-dimensional (3D) flower-like n-ZnO/p-NiO heterostructures with various ZnxNiy molar ratios (Zn5Ni1, Zn2Ni1, Zn1Ni1, Zn1Ni2 and Zn1Ni5) were synthesized by a facile hydrothermal method. Their crystal phase, surface morphology, elemental composition and chemical state were comprehensively investigated by XRD, SEM, EDS, TEM and XPS techniques. Gas sensing measurements were conducted on all the as-developed ZnxNiy-based sensors toward ammonia (NH3) detection under various working temperatures from 160 to 340 °C. In particular, the as-prepared Zn1Ni2 sensor exhibited superior NH3 sensing performance under optimum working temperature (280 °C) including high response (25 toward 100 ppm), fast response/recovery time (16 s/7 s), low detection limit (50 ppb), good selectivity and long-term stability. The enhanced NH3 sensing capabilities of Zn1Ni2 sensor could be attributed to both the specific hierarchical structure which facilitates the adsorption of NH3 molecules and produces much more contact sites, and the improved gas response characteristics of p-n heterojunctions. The obtained results clear demonstrated that the optimum n-ZnO/p-NiO heterostructure is indeed very promising sensing material toward NH3 detection for different applications.

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Section: Resultsmentioning

confidence: 99%

NH3 Sensor Based on 3D Hierarchical Flower-Shaped n-ZnO/p-NiO Heterostructures Yields Outstanding Sensing Capabilities at ppb Level

Zhao

Yang

Wei

et al. 2020

Sensors

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“…In addition, a comparison about the sensing performances of NiO sensors in this work and other literature reports is summarized in Table 1 . It is not difficult to find that the needle-flower NiO based gas sensor in this paper has excellent gas sensing characteristics and has great potential to be a promising candidate for gas-sensitive materials (Lin et al, 2015 ; Lu et al, 2016 ; Majhi et al, 2018 ; San et al, 2018 ).…”

Section: Resultsmentioning

confidence: 99%

3D Flower-Like NiO Hierarchical Structures Assembled With Size-Controllable 1D Blocking Units: Gas Sensing Performances Towards Acetylene

Zhang

Chen

et al. 2018

Front. Chem.

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Acetylene gas (C2H2) is one of the main arc discharge characteristic gases dissolved in power transformer oil. It is of great potential to monitor the fault gas on-line by applying gas sensor technology. In this paper, gas sensors based on nanorods and nanoneedles assembled hierarchical NiO structures have been prepared. Herein, we focus on investigate the relationship between the sizes of the assembling blocking units and gas sensing properties. It can be found that the addition of CTAB/EG plays a vital role in controlling the sizes of blocking unit and assembly manner of 3D hierarchical structures. A comparison study reveals that an enhanced gas sensing performance toward C2H2 for the sensor based on nanoneedle-assembled NiO flowers occurs over that of nanorod-assembled NiO. This enhancement could be ascribed to the larger specific area of needle-flower, which provides more adsorption and desorption sites for chemical reaction as well as effective diffusion channels for C2H2. Besides, a method of calculating the specific surface area without BET testing was presented to verify the results of gas sensing measurement. The possible growth mechanism and gas sensing mechanism were discussed. Such a synthesis way may open up an avenue to tailor the morphologies and control the sizes of blocking units of some other metal oxides and enhance their gas sensing performances.

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“…7 Construction of p-n heterogeneous nanomaterial is an effective way to improve the gas sensitivity of p-type metal oxides. [8][9][10] Several n-type metal-oxides have been reported to improve acetone sensitivity of NiO, including Fe 2 O 3 , MoO 3 , ZnO, WO 3 , TiO 2 and so on. [11][12][13][14][15] Among these reports, the enhancement of Fe 2 O 3 and MoO 3 were more prominent for acetone sensing.…”

Section: Introductionmentioning

confidence: 99%

High acetone sensing properties of In₂O₃–NiO one-dimensional heterogeneous nanofibers based on electrospinning

Fan

2021

RSC Adv.

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A facile one-step hydrothermal synthesis of NiO/ZnO heterojunction microflowers for the enhanced formaldehyde sensing properties

Cited by 103 publications

References 54 publications

NH3 Sensor Based on 3D Hierarchical Flower-Shaped n-ZnO/p-NiO Heterostructures Yields Outstanding Sensing Capabilities at ppb Level

NH3 Sensor Based on 3D Hierarchical Flower-Shaped n-ZnO/p-NiO Heterostructures Yields Outstanding Sensing Capabilities at ppb Level

3D Flower-Like NiO Hierarchical Structures Assembled With Size-Controllable 1D Blocking Units: Gas Sensing Performances Towards Acetylene

High acetone sensing properties of In₂O₃–NiO one-dimensional heterogeneous nanofibers based on electrospinning

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A facile one-step hydrothermal synthesis of NiO/ZnO heterojunction microflowers for the enhanced formaldehyde sensing properties

Cited by 103 publications

References 54 publications

NH3 Sensor Based on 3D Hierarchical Flower-Shaped n-ZnO/p-NiO Heterostructures Yields Outstanding Sensing Capabilities at ppb Level

NH3 Sensor Based on 3D Hierarchical Flower-Shaped n-ZnO/p-NiO Heterostructures Yields Outstanding Sensing Capabilities at ppb Level

3D Flower-Like NiO Hierarchical Structures Assembled With Size-Controllable 1D Blocking Units: Gas Sensing Performances Towards Acetylene

High acetone sensing properties of In2O3–NiO one-dimensional heterogeneous nanofibers based on electrospinning

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High acetone sensing properties of In₂O₃–NiO one-dimensional heterogeneous nanofibers based on electrospinning