Enhanced H2S gas sensing performance of networked CuO-ZnO composite nanoparticle sensor

Park, Sunghoon; Kim, Soo‐Hyun; Kheel, Hyejoon; Hyun, Soong Keun; Jin, Changhyun; Lee, Chongmu

doi:10.1016/j.materresbull.2016.02.011

Cited by 91 publications

(26 citation statements)

References 16 publications

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“…The complex permittivity can be calculated from n and α by using Eqs. (5) and (6) below. The real part of the permittivity is related to the stored energy, while the imaginary part is related to attenuation:…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…The effective optical constants ε r ' and ε r " are computed using Eqs. (5) and (6), and shown in Fig. 7.…”

Section: Terahertz Characterizationmentioning

confidence: 99%

“…Moreover, recent published work shows the growing interest paid to the design of new materials obtained by mixing simple oxides, and forming more complex structures such as ferrites or perovskites. Nevertheless even relatively simple oxides, such as CuO or ZnO, may experience a change of their properties when they are reduced to micro or nano dimensions, making them of interest for catalysis [4] and gas sensing [5][6][7]. Furthermore, there has been increasing interest paid to the use of these materials as additives to improve the energy-storage capacity in various advanced ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Optical constants of CuO and ZnO particles in the terahertz frequency range

Rosa

Locquet

Bouscaud

et al. 2020

Ceramics International

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The optical constants (complex dielectric function) of isotropically distributed CuO and ZnO particles in polyethylene pellets are measured by terahertz time-domain spectroscopy. The determination of the dielectric properties of these materials is of interest for energy-storage applications. Maxwell-Garnett theory is used to extract the contribution to the frequency-dependent optical constants of the oxide powders. The validity of the assumptions of Maxwell-Garnett theory are experimentally verified and self-consistency of the results of the model confirmed. On this basis, experimental complex permittivity values for isotropic CuO and ZnO oxide powders are reported in the 100 GHz-3 THz range.

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Section: Theoretical Frameworkmentioning

confidence: 99%

“…The effective optical constants ε r ' and ε r " are computed using Eqs. (5) and (6), and shown in Fig. 7.…”

Section: Terahertz Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical constants of CuO and ZnO particles in the terahertz frequency range

Rosa

Locquet

Bouscaud

et al. 2020

Ceramics International

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“…All the measurements were carried out under the same condition of about 40% relative humidity. The response performances were similar to typical n -type or p -type semiconductor metal oxides—that is, the resistance decreased (increases) when the n -type ( p -type) semiconductor sensors were exposed to the reducing gas [ 29 , 30 ], which are named the n -type response and p -type response, respectively. For distinction, the n -type response was recorded as the positive ratio of R a /R g —the sensor’s baseline resistance in air (R a ) divided by that in target gas (R g )— while the p -type response was recorded as the negative ratio of (−R g /R a ) [ 31 ].…”

Section: Experimental Schemementioning

confidence: 84%

Gas Sensing Performance and Mechanism of CuO(p)-WO3(n) Composites to H2S Gas

Peng

Sun

et al. 2020

Nanomaterials

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In this work, the compositional optimization in copper oxide/tungsten trioxide (CuO/WO3) composites was systematically studied for hydrogen sulfide (H2S) sensing. The response of CuO/WO3 composites changes from p-type to n-type as the CuO content decreases. Furthermore, the p-type response weakens while the n-type response strengthens as the Cu/W molar ratio decreases from 1:0 to 1:10. The optimal Cu/W molar ratio is 1:10, at which the sensor presents the ultrahigh n-type response of 1.19 × 105 to 20 ppm H2S gas at 40 °C. Once the temperature rises from 40 °C to 250 °C, the CuO/WO3 (1:1) sensor presents the p-n response transformation, and the CuO/WO3 (1:1.5) sensor changes from no response to n-type response, because the increased temperature facilitates the Cu-S bonds break and weakens the p-type CuO contribution to the total response, such that the CuS bond decomposition by a thermal effect was verified by a Raman analysis. In addition, with a decrease in CuO content, the CuO is transformed from partly to completely converting to CuS, causing the resistance of CuO to decrease from increasing and, hence, a weakening mode of p-CuO and n-WO3 to the total response turns to a synergistic mode to it.

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“…The released electrons during this process will recombine with the holes on the surface of CuO and cause the decrease of hole concentration, which will lead to an increased resistance of the gas sensor. According to some previous reports [41,42], a CuS layer might form on the surface of the CuO, when the sensor is exposed to high H 2 S concentrations, the spontaneous chemical reaction is as shown in Equation (6), as follows:…”

Section: The Sensing Mechanismmentioning

confidence: 99%

Effect of Platinum Doping on the Morphology and Sensing Performance for CuO-Based Gas Sensor

Tang

et al. 2018

Applied Sciences

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Pristine and Pt-doped CuO nano-flowers were synthesized by a simple water bath heating method in this paper. Highly sensitive hydrogen sulfide (H 2 S) gas sensors based on Pt-doped CuO nano-flowers were fabricated. Scanning electron microscopy, X-ray diffraction, inductively coupled plasma atomic emission spectrometry, and energy dispersive X-ray spectroscopy were used to examine the characteristics and morphology of materials. The sensing performances of sensors with different concentrations of Pt dopants were evaluated at different operating temperatures. The results indicated that the CuO sensor doped with 1.25 wt % Pt exhibited the highest response (R g /R a , where R g is the resistance in gas, and R a is the resistance in air) of 135.1 to 10 ppm H 2 S at 40 • C, which was 13.1 times higher than the response of a pure CuO sensor. Pt doping also plays an important role for the enhancement of H 2 S selectivity against C 2 H 5 OH, NH 3 , H 2 , CH 3 COCH 3 , and NO 2 .

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Enhanced H2S gas sensing performance of networked CuO-ZnO composite nanoparticle sensor

Cited by 91 publications

References 16 publications

Optical constants of CuO and ZnO particles in the terahertz frequency range

Optical constants of CuO and ZnO particles in the terahertz frequency range

Gas Sensing Performance and Mechanism of CuO(p)-WO3(n) Composites to H2S Gas

Effect of Platinum Doping on the Morphology and Sensing Performance for CuO-Based Gas Sensor

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