In depth study on the notable room-temperature NO2 gas sensor based on CuO nanoplatelets prepared by sonochemical method: Comparison of various bases

Oosthuizen, Dina N.; Motaung, David E.; Swart, H.C.

doi:10.1016/j.snb.2018.03.106

Cited by 68 publications

(25 citation statements)

References 43 publications

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“…[29][30][31][32][33] However, pristine CuO materials show relatively low sensitivity and long response/recovery times. [34][35][36][37][38][39][40][41] Enhancing the gas-sensing performance of p-type semiconductors is important for their effective application. 42 It is reported that surface decoration with noble metals can enhance the gassensing characteristics of metal oxides.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Pd-CuO Nanoplates with Enhanced SO2 and H2 Gas-Sensing Characteristics

Nha

Tong

Duy

et al. 2021

J. Electron. Mater.

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Because of the robustness and high catalytic activity of p-type CuO semiconducting nanostructures, they are applied as sensing materials for various gases. However, pristine CuO materials exhibit relatively low sensing performance to some gases, such as SO 2 and H 2 . Here, we demonstrate an enhancement in the gas-sensing characteristics of CuO nanoplates through surface decoration with Pd nanoparticles. CuO nanoplates were synthesized by a facile hydrothermal method, and Pd nanoparticles were decorated effectively via a directed room-temperature reducing pathway without need for stabilizing agents. The Pd-CuO nanoplates exhibited superior sensitivity, fast response, and recovery times to SO 2 and H 2 compared with their pristine CuO counterpart. The gas-sensing mechanism is discussed from the perspective of the heterojunction between Pd and CuO, as well as the catalytic activity of Pd for the dissociation of gaseous molecules. Such Pd-CuO nanoplate-based sensors could be effectively applied for SO 2 and H 2 gas monitoring.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Pd-CuO Nanoplates with Enhanced SO2 and H2 Gas-Sensing Characteristics

Nha

Tong

Duy

et al. 2021

J. Electron. Mater.

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“…The resistivebased sensors fabricated by using semiconductor metal oxides have attracted tremendous attention for gas sensing due to their exceptional advantages, such as low cost, ease in fabrication, simple and effective geometry, low power requirement, immune to temperature and humidity environment, and easy deployment [3][4][5]. A number of metal oxides such as ZnO [6], CuO [7], SnO 2 [8], TiO 2 [9], WO 3 [10], Fe 2 O 3 [11], NiO [12], and indium oxide (In 2 O 3 ) [13] have been widely studied in gas sensing, especially for NO 2 sensing. However, most of these sensors possess certain limitations, such as need to operate at high working temperature ([ 100 °C), exhibit less response value, and poor selectivity.…”

Section: Introductionmentioning

confidence: 99%

Ultra-high sensitive and ultra-low NO2 detection at low-temperature based on ultrathin In2O3 nanosheets

Cao¹,

Chen²,

Cai³

et al. 2021

J Mater Sci: Mater Electron

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In this study, the high oxygen vacancy-rich ultrathin indium oxide (In 2 O 3 ) nanosheets are synthesized by low-cost and environmental-friendly solvothermal method. The gas sensing properties of In 2 O 3 nanosheets to low concentration of nitrogen dioxide (NO 2 ) (concentration in 5 ppb to 5 ppm) at 50 °C are investigated. All In 2 O 3 samples are successfully characterized using various techniques to obtain the information related to phase, morphological, oxygen vacancies, and surface area, etc. It is observed that among all the samples, the In 2 O 3 -350 exhibited benchmarked response of around 3223 at 2 ppm NO 2 gas, with theoretical detection limit down to ppb level. The sensor has shown superior sensing characteristics, such as wide sensing bandwidth, excellent selectivity, high long-term stability, and good repeatability. It is considered that the high oxygen deficiency present on In 2 O 3 nanosheets acts as favorable reaction sites for such remarkable sensing performance, and therefore, these improved gas-sensing properties make the In 2 O 3 nanosheets suitable to detect NO 2 at low-temperature.

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“…Among the various detection methods, metal oxide semiconductor gas sensors have been widely used in the detecting of toxic, flammable, and explosive gases; monitoring air quality; and food processing, due to their simplicity, high sensitivity, low cost, and compatibility with modern electronic devices [8,9]. In recent years, many researchers have utilized metal oxide semiconductor sensors to detect H 2 S gas, including CuO [10,11], In 2 O 3 [12], ZnO [13,14] SnO 2 [15], and WO 3 [16]. Cupric oxide (CuO), as a typical 2 of 14 p-type semiconductor with a band gap of 1.2 eV [17], has been widely investigated in lithium-ion batteries [18], super-capacitors [19], heterogeneous catalysts [20], and particularly in gas detection devices.…”

Section: Introductionmentioning

confidence: 99%

“…The gas sensitivity of CuO-based gas sensors has been widely reported. Ramgir et al [10] reported H 2 S gas sensors based on CuO thin films, and the results showed that the response of CuO thin films to sub-ppm (100-400 ppb) H 2 S at room temperature was highly reversible. However, once the concentration was higher than 400 ppb, the response became irreversible.…”

Section: Introductionmentioning

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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In depth study on the notable room-temperature NO2 gas sensor based on CuO nanoplatelets prepared by sonochemical method: Comparison of various bases

Cited by 68 publications

References 43 publications

Facile Synthesis of Pd-CuO Nanoplates with Enhanced SO2 and H2 Gas-Sensing Characteristics

Facile Synthesis of Pd-CuO Nanoplates with Enhanced SO2 and H2 Gas-Sensing Characteristics

Ultra-high sensitive and ultra-low NO2 detection at low-temperature based on ultrathin In2O3 nanosheets

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

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