Enhanced room-temperature NO2 sensing performance of mulberry-like Cu2O/CuO composites

Ni, Ming-Jiu; Han, Shuai; Liang, Zhiping; Liu, Siwei; Zhang, Xiangzhao; Hussain, Shahid; Wang, Mingsong; Qiao, Guanjun; Liu, Guiwu

doi:10.1016/j.sna.2022.114136

Cited by 11 publications

(7 citation statements)

References 63 publications

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“…When NO 2 molecules are introduced, NO 2 molecules capture electrons in the conduction band of CuO to form NO 2 – (ads) owing to their high electron affinity. In addition, NO 2 will further react with the surface-enriched O 2 – , consuming the surface O 2 – -enriched layer, which further reduces the resistance. , O 2 ( g a s ) → O 2 ( a d s ) O 2 ( a d s ) + e − → O 2 ( a d s ) − normalN O 2 ( g a s ) + e − → normalN O 2 ( a d s ) − normalN O 2 ( g a s ) + O 2 ( a d s ) − + 2 …”

Section: Results and Discussionmentioning

confidence: 99%

Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level

Ma,

Yang,

et al. 2024

ACS Appl. Nano Mater.

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P-type semiconductors [copper oxide (CuO) and cuprous oxide (Cu 2 O)] have been widely researched as good gas sensing materials due to their unique oxygen adsorption properties. In this work, C-doped CuO/Cu 2 O hollow nano-octahedrons have been prepared by thermal decomposition of the Cu-based metal−organic framework ([Cu 3 (BTC) 2 ] n ). The CuO and Cu 2 O nanoparticles form nano-octahedron heterojunctions by a close packing mode. A large number of active heterojunction sites were exposed, which significantly increased the adsorbed oxygen (O 2 − ) content. Meanwhile, doping C in the lattice of the heterojunction effectively reduces the band gap of CuO/Cu 2 O and promotes the chemical reaction of the target gas on the surface of the material. Density functional theory calculations indicate that the CuO/Cu 2 O heterojunction has strong adsorption ability for NO 2 . Electrochemical impedance spectroscopy further reveals that C-doped CuO/Cu 2 O hollow nano-octahedrons-40 min heterojunction has the best electron transport performance. The sensors have good gas sensing response (22.88−50 ppm) and selectivity to nitrogen dioxide (NO 2 ) at room temperature (28 °C). In addition, the sensor has extremely low detection, which can detect parts per billion level NO 2 (20.50% to 100 ppb). It is expected to provide a reference for the development of a room-temperature NO 2 sensor.

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Section: Results and Discussionmentioning

confidence: 99%

Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level

Ma,

Yang,

et al. 2024

ACS Appl. Nano Mater.

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“…In the case of copper, the Cu 2p 3/2 and Cu 2p 1/2 doublet peaks of 0.5–1.5 wt %Cu-rGO/In 2 O 3 samples (Figure d) were found at 933. 2 and 95 2 .7 eV, respectively, signifying the Cu + oxidation state of Cu 2 O. , …”

Section: Resultsmentioning

confidence: 99%

Microwave-Assisted Hydrothermal/Impregnation Synthesis of Cu₂O-Decorated rGO/In₂O₃ Nanorices for Sensitive SO₂ Gas Sensors

Leangtanom

Wisitsoraat

Tuantranont

et al. 2023

ACS Appl. Nano Mater.

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In the present development, Cu 2 O-decorated reduced graphene oxide/indium oxide (rGO/In 2 O 3 ) nanorices with Cu contents of 0−1.5 wt % were synthesized by a microwaveassisted hydrothermal method combined with impregnation and studied for gas-sensing applications toward SO 2 . The material characterization results revealed that 3−5 nm Cu 2 O secondary nanoparticles were uniformly decorated on porous In 2 O 3 nanorices mixed with rGO sheets. Based on systematic gas-sensing measurements, Cu 2 O decoration on rGO/In 2 O 3 nanorices with the optimal Cu content of 1.0 wt % provided a considerably improved SO 2 response of 11.1 to 5 ppm SO 2 , which was approximately 3.3-fold as high as that of pristine rGO/In 2 O 3 nanorices (3.4) at an optimal temperature of 200 °C. Additionally, high SO 2 selectivity was attained against NO 2 , NO, CO, H 2 S, C 2 H 5 OH, C 2 H 4 , H 2 , and NH 3 . Moreover, the Cu 2 O-rGO/In 2 O 3 sensors displayed low humidity sensitivity, good repeatability, and satisfactory long-term stability. Therefore, Cu 2 O-decorated rGO/In 2 O 3 nanorices represented one of the most promising SO 2 sensors for environmental and practical applications.

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“…10(b), O 2 molecules can quickly diffuse and easily adsorb on the surface of the 550Cu 2 O/CuO@rGO-5 material to form adsorbed oxygen (O 2(ads) ) and ions (O 2 − and O − ) in the air (see eqn (3)–(5)). 52 Due to the work function of Cu 2 O (4.80 eV) being lower than that of CuO (5.30 eV) 67 and the Fermi level of CuO being lower than that of Cu 2 O, which leads to electron transfer from Cu 2 O to CuO until their Fermi levels are balanced. This dynamic process leads to the formation of a hole accumulation layer (HAL) on the surface of Cu 2 O, and the corresponding electron accumulation layer (EAL) is generated on the surface of CuO.…”

Section: Resultsmentioning

confidence: 99%

One-step green synthesis of Cu₂O/CuO@rGO composites for ppt level detection of NO₂ at room temperature

Li,

Hu,

et al. 2023

J. Mater. Chem. C

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Enhanced room-temperature NO2 sensing performance of mulberry-like Cu2O/CuO composites

Cited by 11 publications

References 63 publications

Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level

Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level

Microwave-Assisted Hydrothermal/Impregnation Synthesis of Cu₂O-Decorated rGO/In₂O₃ Nanorices for Sensitive SO₂ Gas Sensors

One-step green synthesis of Cu₂O/CuO@rGO composites for ppt level detection of NO₂ at room temperature

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Enhanced room-temperature NO2 sensing performance of mulberry-like Cu2O/CuO composites

Cited by 11 publications

References 63 publications

Cu-MOF-Derived C-Doped CuO/Cu2O Hollow Nano-Octahedrons for Room-Temperature NO2 Sensing at the ppb Level

Cu-MOF-Derived C-Doped CuO/Cu2O Hollow Nano-Octahedrons for Room-Temperature NO2 Sensing at the ppb Level

Microwave-Assisted Hydrothermal/Impregnation Synthesis of Cu2O-Decorated rGO/In2O3 Nanorices for Sensitive SO2 Gas Sensors

One-step green synthesis of Cu2O/CuO@rGO composites for ppt level detection of NO2 at room temperature

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Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level

Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level

Microwave-Assisted Hydrothermal/Impregnation Synthesis of Cu₂O-Decorated rGO/In₂O₃ Nanorices for Sensitive SO₂ Gas Sensors

One-step green synthesis of Cu₂O/CuO@rGO composites for ppt level detection of NO₂ at room temperature