Controlled oxidation of Cu particles by H2O2 to form Cu/CuO nanostructure with enhanced gas sensing performance

Xu, M.; Xi, Ran; Chen, Ruoli; Chen, Maoshen; Qi, Ruijuan; Dai, Chengqin; Luo, Chunhua; Lin, Hechun

doi:10.1016/j.apsusc.2023.156668

Cited by 8 publications

(7 citation statements)

References 63 publications

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“…33 The Cu LMM Auger spectra of Cu/CuOx-200, Cu/CuOx-250, Cu/CuOx-300, Cu/CuOx-350, and used Cu/CuOx-250 catalysts showed two peaks at 916.0–916.4 eV and 918.0–918.3 eV, which can be attributed to Cu 1+ and Cu 0 species, respectively. 29 This result confirmed the formation of Cu 1+ (916.6 eV) and Cu 0 (918.6 eV) on the catalyst surface. The appearance of Cu 1+ species on the surface was attributed to the air exposure during the sample transfer from the batch reactor to the XPS, and slight reoxidation of Cu 0 can be expected.…”

Section: Resultssupporting

confidence: 69%

α-Alkylation of ketones with primary alcohols by an active non-noble metal Cu/CuOx catalyst

Yang,

Wang,

Chang

2024

Org. Biomol. Chem.

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Section: Resultssupporting

confidence: 69%

α-Alkylation of ketones with primary alcohols by an active non-noble metal Cu/CuOx catalyst

Yang,

Wang,

Chang

2024

Org. Biomol. Chem.

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“…In principle, the combination of particle size reduction (through H 2 O 2 treatment) and PULM should be applicable to a wide range of n-type MOS chemiresistors . For p-type MOSs, though the H 2 O 2 treatment may result in smaller grain size or higher reactivity, , the hole accumulation layer (HAL) configuration of p-type MOSs under an ambient air atmosphere is different from electron depletion layer (EDL) configuration of n-type MOSs, which not only results in a smaller response but also a smaller PULM resistance oscillation than their n-type counterparts. Therefore, the present approach may not work well for p-type MOS chemiresistors.…”

Section: Resultsmentioning

confidence: 99%

H₂O₂-Treated ZnO Nanostructures for Humidity-Tolerant O₃ Chemiresistors Operated under Pulsed UV Light Modulation

Mi,

Deng,

Chang

et al. 2023

ACS Appl. Nano Mater.

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Severe humidity interference or even poison, especially at room temperature (RT), poses a challenge for the practical application of metal oxide semiconductor (MOS)-based chemiresistors for the monitoring of hazardous O3 vapor in a real humid air background, owing to the intrinsic hydrophilicity of general MOSs. Herein, we demonstrated that the humidity-tolerance performance of an ultraviolet (UV)-activated ZnO chemiresistor (operated at RT) toward O3 could be drastically improved by a facile H2O2 treatment. The onset of humidity poison starts around a relative humidity (RH) of 30% for a pristine ZnO chemiresistor, while the H2O2-treated ZnO (H2O2–ZnO) chemiresistor enables robust operation under a highly humid air background (90% RH). The response of ppb-level O3 under humid air could be further enhanced by pulsed UV light modulation (PULM) operation, and a high response (25 for 350 ppb of O3) could be achieved at RT and 90% RH, which is comparable or even higher than that of the state-of-the-art O3 chemiresistors (including the commercial MQ131 O3 sensor operated at 200 °C). The passivation of surface oxygen vacancy (VO) defects and reduction of grain size via H2O2 treatment probably enhance the humidity tolerance. Our work may shed light on the design of high-performance humidity-tolerant RT MOS chemiresistors for monitoring hazardous gases in ambient humid air.

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“…As many authors report in the literature, CuO is highly selective in the absorption of ethanol and is thus largely used as active material for electrochemical ethanol detection. However, only a few contributions describe how to exploit these materials as microwave sensors [ 31 , 32 , 33 , 34 , 35 , 36 ]. Using the described method allows high CuOx layer surface area growth directly on the Cu substrate to be obtained.…”

Section: Antenna Sensor Design and Realizationmentioning

confidence: 99%

Microstrip Copper Nanowires Antenna Array for Connected Microwave Liquid Sensors

Cardillo

Tavella

Ampelli

2023

Sensors

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In this contribution, a 25 GHz planar antenna, designed and realized in microstrip technology, is exploited as a lightweight and compact liquid sensor. The high working frequency allows minimization of the sensor dimension. Moreover, particular attention was paid to keeping the design cost low. Indeed, the frequency of 25 GHz is widely exploited for many applications, e.g., up to the last decade concerning radars and, recently, 5G technology. Available commercial antennas allowed minimization of the effort that is usually required to design the microstrip sensor. The antenna was in-house realized, and the microstrip Cu conductor was modified through controlled anodic oxidation in order to enhance the sensing features. The sensor capability of detecting the presence and concentration of ethanol in water was experimentally demonstrated. In detail, a sensitivity of 0.21 kHz/(mg/L) and an average quality factor of 117 were achieved in a very compact size, i.e., 18 mm × 19 mm, and in a cost-effective way. As a matter of fact, the availability of devices able to collect data and then to send the related information wirelessly to a remote receiver represents a key feature for the next generation of connected smart sensors.

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Controlled oxidation of Cu particles by H2O2 to form Cu/CuO nanostructure with enhanced gas sensing performance

Cited by 8 publications

References 63 publications

α-Alkylation of ketones with primary alcohols by an active non-noble metal Cu/CuOx catalyst

α-Alkylation of ketones with primary alcohols by an active non-noble metal Cu/CuOx catalyst

H₂O₂-Treated ZnO Nanostructures for Humidity-Tolerant O₃ Chemiresistors Operated under Pulsed UV Light Modulation

Microstrip Copper Nanowires Antenna Array for Connected Microwave Liquid Sensors

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Controlled oxidation of Cu particles by H2O2 to form Cu/CuO nanostructure with enhanced gas sensing performance

Cited by 8 publications

References 63 publications

α-Alkylation of ketones with primary alcohols by an active non-noble metal Cu/CuOx catalyst

α-Alkylation of ketones with primary alcohols by an active non-noble metal Cu/CuOx catalyst

H2O2-Treated ZnO Nanostructures for Humidity-Tolerant O3 Chemiresistors Operated under Pulsed UV Light Modulation

Microstrip Copper Nanowires Antenna Array for Connected Microwave Liquid Sensors

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H₂O₂-Treated ZnO Nanostructures for Humidity-Tolerant O₃ Chemiresistors Operated under Pulsed UV Light Modulation