A sub-ppm level formaldehyde gas sensor based on Zn-doped NiO prepared by a co-precipitation route

Fomekong, Roussin Lontio; Kamta, Hypolite Mathias Tedjieukeng; Lambi, John Ngolui; Lahem, Driss; Eloy, Pierre; Debliquy, Marc; Delcorte, Arnaud

doi:10.1016/j.jallcom.2017.10.089

Cited by 78 publications

(9 citation statements)

References 39 publications

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“…Formaldehyde (HCHO), as a typical colorless toxic gas with a pungent smell, can cause serious harm to the central nervous system and immune system of human beings. − Because of its high toxicity, formaldehyde gas can be released in homes, offices, and urban environment, and human health is greatly threatened if the permissible exposure limit of 15 ppm formaldehyde is exceeded. , Therefore, the detection of low-concentration HCHO is crucial to atmospheric environmental supervision and control. Kim et al synthesized a 3D network of a Co 3 O 4 -based formaldehyde gas sensor, and Park et al prepared ZnCo 2 O 4 hollow spheres for HCHO detection .…”

Section: Introductionmentioning

confidence: 99%

Nanoheterostructure Construction and DFT Study of Ni-Doped In₂O₃ Nanocubes/WS₂ Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature

Zhang

Cao

Yang

et al. 2020

ACS Appl. Mater. Interfaces

172

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A high-performance formaldehyde sensor based on nickel (Ni)-doped indium trioxide (In2O3)/tungsten disulfide (WS2) nanocomposite was demonstrated. An epoxy substrate served as matrix of the Ni–In2O3/WS2 nanocomposite sensor. The material properties of self-assembled Ni–In2O3/WS2 nanoheterostructure were fully characterized and confirmed. The formaldehyde-sensing properties of the Ni–In2O3/WS2 composite were tested at 25 °C. Compared to the In2O3, WS2, and their composite, the Ni–In2O3/WS2 sensor demonstrated significant improvement on the formaldehyde-sensing performance, including a low detection limit of 15 ppb, good selectivity, repeatability, fast detection rate, and a fair logarithmic function toward formaldehyde concentration. The dramatically enhanced sensing performance of Ni–In2O3/WS2 film sensor can be attributed to the Ni ion doping and synergistic interfacial incorporation of In2O3/WS2 heterojunction. The sensitive mechanism of the Ni–In2O3/WS2 film sensor toward formaldehyde is explored through density functional theory (DFT) simulation. This work verified that the synthesis of Ni-doped In2O3/WS2 nanofilm provides a new avenue to develop promising hybrids for formaldehyde sensing.

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Section: Introductionmentioning

confidence: 99%

Nanoheterostructure Construction and DFT Study of Ni-Doped In₂O₃ Nanocubes/WS₂ Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature

Zhang

Cao

Yang

et al. 2020

ACS Appl. Mater. Interfaces

172

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“…The peaks located at 853.6 eV, 855.6 eV, and 861.1 eV are assigned to Ni2p 3/2 and its satellite peak. The higher binding energy located at 872.6 eV along with 879.1 eV can be attributed to Ni 2p 1/2 and its corresponding satellite peak, which indicate the presence of Ni in the product [ 27 , 28 ]. Furthermore, the O 1s spectrum exhibits the two oxygen states of 529.5 eV and 531.2 eV Figure 5 d. The lower binding energy peak corresponds to the lattice oxygen of O 2− in the oxide (ZnO, NiO), and the higher energy peak is associated with the chemisorbed oxygen species such as O − and O 2 − [ 29 ].…”

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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“…When the gas sensor based on 1% GO@SnO 2 NF/NSs was tested in HCHO gas atmosphere of 50 ppm, the response and recovery times of gas sensor were 8.1 min and 3.0 min, respectively. Long response and recovery time can be ascribed to the low operation temperature that makes kinetic of the adsorption and desorption of oxygen and target gas on the surface of the lower sensing material, which causes a slow response and recovery process [44]. To investigate the relationship of HCHO gas concentration and response value of gas sensors, these gas sensors based on pure SnO 2 NF/NSs and SnO 2 NF/NSs with different GO loading amounts were tested in various HCHO gas concentrations.…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

2019

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In this work, we reported a formaldehyde (HCHO) gas sensor with highly sensitive and selective gas-sensing performance at low operating temperature based on graphene oxide (GO)@SnO 2 nanofiber/nanosheets (NF/NSs) nanocomposites. Hierarchical SnO 2 NF/NSs coated with GO nanosheets showed enhanced sensing performance for HCHO gas, especially at low operating temperature. A series of characterization methods, including X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) were used to characterize their microstructures, morphologies, compositions, surface areas and so on. The sensing performance of GO@SnO 2 NF/NSs nanocomposites was optimized by adjusting the loading amount of GO ranging from 0.25% to 1.25%. The results showed the optimum loading amount of 1% GO in GO@SnO 2 NF/NSs nanocomposites not only exhibited the highest sensitivity value (R a /R g = 280 to 100 ppm HCHO gas) but also lowered the optimum operation temperature from 120 • C to 60 • C. The response value was about 4.5 times higher than that of pure hierarchical SnO 2 NF/NSs (R a /R g = 64 to 100 ppm). GO@SnO 2 NF/NSs nanocomposites showed lower detection limit down to 0.25 ppm HCHO and excellent selectivity against interfering gases (ethanol (C 2 H 5 OH), acetone (CH 3 COCH 3 ), methanol (CH 3 OH), ammonia (NH 3 ), methylbenzene (C 7 H 8 ), benzene (C 6 H 6 ) and water (H 2 O)). The enhanced sensing performance for HCHO was mainly ascribed to the high specific surface area, suitable electron transfer channels and the synergistic effect of the SnO 2 NF/NSs and GO nanosheets network.Molecules 2020, 25, 35 2 of 15 sensitivity, poor selectivity and/or relatively high optimum operation temperature. Hence, designing and developing gas sensors with high sensibility, excellent selectivity and lower optimum operation temperature is urgent and important.Graphene is a typical two-dimensional (2D) sheet of sp 2 bonded carbon with excellent electronic applications. Due to its unique physical and chemical properties, many efforts have been carried out on the application of graphene as sensing elements [12]. These advantages, including its high conductivity, large surface area and low electrical noise, make it a promising platform for preparing new sensors [13][14][15]. In order to prepare a new gas sensor with high sensing performance, low operation temperature and excellent selectivity, the combination of graphene and metal oxide semiconductors is a new strategy to enhance sensing performance compared to pure sensing materials [16]. Gaikwad et al. have reported a NH 3 gas sensor based on Polyaniline/Graphene Oxide (PANI/GO) by nanoemulsion method [17]. Sun et al. have synthesized rGO/ZnSnO 3 composites as a sensing material for detecting HCHO gas by a facile solution-based self-assembly synthesis method [18]. Rong et al. have prepared microstructures of SnO 2 @rGO nanocomposites for HCHO detection by facile thermal treatment ...

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A sub-ppm level formaldehyde gas sensor based on Zn-doped NiO prepared by a co-precipitation route

Cited by 78 publications

References 39 publications

Nanoheterostructure Construction and DFT Study of Ni-Doped In₂O₃ Nanocubes/WS₂ Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature

Nanoheterostructure Construction and DFT Study of Ni-Doped In₂O₃ Nanocubes/WS₂ Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature

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

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

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A sub-ppm level formaldehyde gas sensor based on Zn-doped NiO prepared by a co-precipitation route

Cited by 78 publications

References 39 publications

Nanoheterostructure Construction and DFT Study of Ni-Doped In2O3 Nanocubes/WS2 Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature

Nanoheterostructure Construction and DFT Study of Ni-Doped In2O3 Nanocubes/WS2 Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature

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

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

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Nanoheterostructure Construction and DFT Study of Ni-Doped In₂O₃ Nanocubes/WS₂ Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature

Nanoheterostructure Construction and DFT Study of Ni-Doped In₂O₃ Nanocubes/WS₂ Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature