Highly sensitive H2S sensors based on Cu2O/Co3O4 nano/microstructure heteroarrays at and below room temperature

Cui, Guangliang; Zhang, Pinhua; Chen, Li; Wang, Xiaoli; Li, Jianfu; Shi, Changmin; Wang, Dongchao

doi:10.1038/srep43887

Cited by 31 publications

(15 citation statements)

References 35 publications

(37 reference statements)

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“…This is also the reason for the formation of the porous structure. Finally, this periodic deposition process led to the periodic variation in surface elevation of Cu nanoarrays [20,21,22,23].…”

Section: Resultsmentioning

confidence: 99%

Au@Cu Nanoarrays with Uniform Long-Range Ordered Structure: Synthesis and SERS Applications

et al. 2018

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The nanostructures with uniform long-range ordered structure are of crucial importance for performance standardization of high-quality surface-enhanced Raman scattering (SERS) spectra. In this paper, we described the fabrication and SERS properties of Au decorated Cu (Au@Cu) nanoarrays. The Cu nanoarrays with uniform long-range ordered structure were first synthesized by in-situ electrochemistry assembly on insulated substrate. The Cu nanoarrays can reach a size of centimeters with strictly periodic nano-microstructure, which is beneficial for the production and performance standardization of SERS substrates. Then Au nanoparticals were decorated on the Cu nanoarrays by galvanic reaction without any capping agent. The obtained Au@Cu nanoarrays exhibit excellent SERS activity for 4-Mercaptopyridine, and the sensitivity limit is as low as 10−8 M. Therefore, this facile route provides a useful platform for the fabrication of SERS substrates based on nano ordered arrays.

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Section: Resultsmentioning

confidence: 99%

Au@Cu Nanoarrays with Uniform Long-Range Ordered Structure: Synthesis and SERS Applications

et al. 2018

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“…It is worth noting that during H 2 S detection, a reversible reaction between the cuprous oxide and hydrogen sulfide Cu 2 S formation may occur. Due to the phase transformation, a highly electrical conductive path is being formed, thus enhancing the electrical conductance [79].…”

Section: Basic Properties Of Chosen Metal Oxidesmentioning

confidence: 99%

Surface-Controlled Photocatalysis and Chemical Sensing of TiO2, α-Fe2O3, and Cu2O Nanocrystals

et al. 2019

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A relatively new approach to the design of photocatalytic and gas sensing materials is to use the shape-controlled nanocrystals with well-defined facets exposed to light or gas molecules. An abrupt increase in a number of papers on the synthesis and characterization of metal oxide semiconductors such as a TiO2, α-Fe2O3, Cu2O of low-dimensionality, applied to surface-controlled photocatalysis and gas sensing, has been recently observed. The aim of this paper is to review the work performed in this field of research. Here, the focus is on the mechanism and processes that affect the growth of nanocrystals, their morphological, electrical, and optical properties and finally their photocatalytic as well as gas sensing performance.

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“…However, one of the main disadvantages is their low selectivity. Different approaches were used in order to increase the selectivity and sensitivity to hydrogen sulfide by various scientific groups: composites based on n-type and p-type semiconductors [7][8][9][10][11][12], decoration and modification with catalytic phases and nanoparticles [13][14][15][16], the morphology change [17][18][19][20][21]. The use of organic-inorganic hybrid materials as gas sensors is a promisingly developing area and of particular interest [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline SnO2 Functionalized with Ag(I) Organometallic Complexes as Materials for Low Temperature H2S Detection

et al. 2021

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This paper presents a comparative analysis of H2S sensor properties of nanocrystalline SnO2 modified with Ag nanoparticles (AgNPs) as reference sample or Ag organic complexes (AgL1 and AgL2). New hybrid materials based on SnO2 and Ag(I) organometallic complexes were obtained. The microstructure, compositional characteristics and thermal stability of the composites were thoroughly studied by X-ray diffraction (XRD), X-ray fluorescent spectroscopy (XRF), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and Thermogravimetric analysis (TGA). Gas sensor properties to 2 ppm H2S demonstrated high sensitivity, selectivity toward other reducing gases (H2 (20 ppm), NH3 (20 ppm) and CO (20 ppm)) and good reproducibility of the composites in H2S detection at low operating temperatures. The composite materials also showed a linear detection range in the concentration range of 0.12–2.00 ppm H2S even at room temperature. It was concluded that the predominant factors influencing the sensor properties and selectivity toward H2S in low temperature region are the structure of the modifier and the chemical state of silver. Thus, in the case of SnO2/AgNPs reference sample the chemical sensitization mechanism is more possible, while for SnO2/AgL1 and SnO2/AgL2 composites the electronic sensitization mechanism contributes more in gas sensor properties. The obtained results show that composites based on nanocrystalline SnO2 and Ag(I) organic complexes can enhance the selective detection of H2S.

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Highly sensitive H2S sensors based on Cu2O/Co3O4 nano/microstructure heteroarrays at and below room temperature

Cited by 31 publications

References 35 publications

Au@Cu Nanoarrays with Uniform Long-Range Ordered Structure: Synthesis and SERS Applications

Au@Cu Nanoarrays with Uniform Long-Range Ordered Structure: Synthesis and SERS Applications

Surface-Controlled Photocatalysis and Chemical Sensing of TiO2, α-Fe2O3, and Cu2O Nanocrystals

Nanocrystalline SnO2 Functionalized with Ag(I) Organometallic Complexes as Materials for Low Temperature H2S Detection

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