Facile synthesis and ppb-level H2S sensing performance of hierarchical CuO microflowers assembled with nano-spindles

Wu, Kaidi; Zhang, Chao

doi:10.1007/s10854-020-03332-8

Cited by 18 publications

(4 citation statements)

References 48 publications

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“…as a solvent. 19,76,77 The final morphology of metal oxides during the synthesis is generally affected by the following factors: (i) the type of solvent, (ii) the reaction temperature, [611] (iii) the hydrothermal time, 60,64 (iv) the concentration of copper salt, 78 and (v) the type of shape directing agent. 79 To investigate the influence of the reaction temperature and the solvent types on the morphology of sensitive materials, Bhuvaneshwari et al 61 have developed 3-dimensional (3D) CuO superstructures under different reaction conditions, as given in Fig.…”

Section: Hydrothermal Methodsmentioning

confidence: 99%

Copper-based metal oxides for chemiresistive gas sensors

et al. 2022

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Section: Hydrothermal Methodsmentioning

confidence: 99%

Copper-based metal oxides for chemiresistive gas sensors

et al. 2022

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“…Also, composite materials are studied to increase the sensitivity and selectivity. Doping of polycrystalline tin oxide (SnO 2 ) with CuO increases the sensitivity to H 2 S by more than 3 orders of magnitude. − Additionally, by using pure CuO microstructures or CuO/Pd nanocomposites, the sensitivity and selectivity to H 2 S can be increased. , However, the combination of both, high sensitivity and high selectivity at the same time is still difficult to accomplish.…”

Section: Introductionmentioning

confidence: 99%

“…17 structures or CuO/Pd nanocomposites, the sensitivity and selectivity to H 2 S can be increased. 20,21 However, the combination of both, high sensitivity and high selectivity at the same time is still difficult to accomplish. Gas dosimeters, as used in the present study, are based on a possible strategy to overcome such detection limitations.…”

Section: Introductionmentioning

confidence: 99%

Porous SiO₂ Nanofibers Loaded with CuO Nanoparticles for the Dosimetric Detection of H₂S

Werner

Seitz

Beck

et al. 2021

ACS Appl. Nano Mater.

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Mesoporous SiO2 nanofibers were prepared by electrospinning dispersions of preformed SiO2 nanoparticles and infiltrated with soluble Cu compounds, forming CuO/SiO2 nanocomposites after heat treatment in ambient air. These composites were used as sensor material in H2S dosimeters, which is based on the formation of conductive CuS, allowing for the dosimetric detection of H2S via the significant increase in conductance. The use of CuO/SiO2 nanocomposites targeted the improvement of the morphological stability of CuO nanostructures during the H2S detection, being confined in a rigid nanoscopic scaffold. Also, we aimed at understanding the parameters determining the decrease in sensing performance commonly observed for CuO-based H2S sensors. As a main result, these CuO/SiO2 nanofibers can be used for gas sensing of H2S in a quasi-continuous and dosimetric detection mode for up to 130 cycles for a concentration of 5 ppm, which exceeds the performance of pure CuO materials. As a concentration of 5 ppm is regarded as a level above which H2S is considered to be harmful, the materials show potential for H2S sensors with long-term stability. The deterioration in the sensing properties is attributed to the irreversible formation of CuSO4. Building on these insights, our study indicates strategies to further improve CuO-based sensors for H2S.

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“…More recently, a favorable method to improve the adsorption capability of SPR sensors by depositing nanomaterials onto the metal film has been investigated for highly sensitive detection, where the amount of gas molecular can be efficiently adsorbed on the nanomaterials film that induces a larger change of local dielectric constant. Metal oxide-based nanomaterials sensing films, such as WO 3 [19], SnO 2 [20], ZnO [21], CuO [22], and TiO 2 [23], have been employed to detect gas on account of the potential compatibility with low cost and high chemical stability. As a n-type oxide semiconductor (E g = 3.2 eV), TiO 2 has served as the most potential candidates for H 2 S detection, since the surface of TiO 2 material exhibits strong adsorption ability for H 2 S [24,25], rendering noticeable modification in the electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive fiber-optic SPR sensor with surface coated TiO₂/MWCNT composite film for hydrogen sulfide gas detection

Chen¹,

Lan²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

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Hydrogen sulfide (H2S) gas poses a severe effect on the respiratory system of the human body and ambient environment, necessitating development of on-line H2S gas sensors with high performance for safety and health concerns. Here, we proposed a fiber-optic surface plasmon resonance (SPR) sensor for H2S detection employing TiO2nanoparticles and multilayer carbon nanotubes composite (TiO2/MWCNT) as sensing film, featuring desirable advantages of highly sensitivity, selectivity, and real-time detection. Benefiting from special structure and large specific surface area of MWCNTs, the adsorption capacity of sensing surface to gas molecules can be significantly enhanced. Moreover, the high carrier mobility of MWCNTs can further promote the charge transfer between TiO2 and H2S. These unique features of TiO2/MWCNT composite film result in an obvious improvement of sensitivity for H2S detection. Experimental results show that the maximum sensitivity of 21.76 pm/ppm and detection limit of 0.2 ppm can be obtained by appropriately optimizing the componential constitutions of TiO2/MWCNT composite. Such detection limit is strikingly lower than the threshold concentrations in workplace set by Federal Institute for Occupational Safety (10 ppm). In addition, the favorable selectivity, response/recovery times, repeatability and stability were demonstrated as well. This facile and cost-effective work provides a novel strategy for constructing high performance H2S gas sensor with fast response and real-time detection, which has prospective application in the fields of human health and environmental conservation.

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Facile synthesis and ppb-level H2S sensing performance of hierarchical CuO microflowers assembled with nano-spindles

Cited by 18 publications

References 48 publications

Copper-based metal oxides for chemiresistive gas sensors

Copper-based metal oxides for chemiresistive gas sensors

Porous SiO₂ Nanofibers Loaded with CuO Nanoparticles for the Dosimetric Detection of H₂S

Highly sensitive fiber-optic SPR sensor with surface coated TiO₂/MWCNT composite film for hydrogen sulfide gas detection

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Facile synthesis and ppb-level H2S sensing performance of hierarchical CuO microflowers assembled with nano-spindles

Cited by 18 publications

References 48 publications

Copper-based metal oxides for chemiresistive gas sensors

Copper-based metal oxides for chemiresistive gas sensors

Porous SiO2 Nanofibers Loaded with CuO Nanoparticles for the Dosimetric Detection of H2S

Highly sensitive fiber-optic SPR sensor with surface coated TiO2/MWCNT composite film for hydrogen sulfide gas detection

Contact Info

Product

Resources

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Porous SiO₂ Nanofibers Loaded with CuO Nanoparticles for the Dosimetric Detection of H₂S

Highly sensitive fiber-optic SPR sensor with surface coated TiO₂/MWCNT composite film for hydrogen sulfide gas detection