ACS Applied Nano Materials
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2024
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IF 5.3
Chaofan Ma,Qun Yang,Huiyu Su,Huimin Yang,Xiaoxia Wang,Dawen Zeng
P-type semiconductors [copper oxide (CuO) and cuprous oxide (Cu2O)] have been widely researched as good gas sensing materials due to their unique oxygen adsorption properties. In this work, C-doped CuO/Cu2O hollow nano-octahedrons have been prepared by thermal decomposition of the Cu-based metal–organic framework ([Cu3(BTC)2]n). The CuO and Cu2O 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 (O2–) content. Meanwhile, doping C in the lattice of the heterojunction effectively reduces the band gap of CuO/Cu2O and promotes the chemical reaction of the target gas on the surface of the material. Density functional theory calculations indicate that the CuO/Cu2O heterojunction has strong adsorption ability for NO2. Electrochemical impedance spectroscopy further reveals that C-doped CuO/Cu2O 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 (NO2) at room temperature (28 °C). In addition, the sensor has extremely low detection, which can detect parts per billion level NO2 (20.50% to 100 ppb). It is expected to provide a reference for the development of a room-temperature NO2 sensor.
研究领域:
材料科学
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化学
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环境科学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 22
·11980-11989
·
IF 12.732
Zhuo Liu,He Lv,Ying Xie,Jue Wang,Jiahui Fan,Baihe Sun,Lin Jiang,Yang Zhang,Ruihong Wang,Keying Shi
Very diverse two-dimensional (2D) materials have bloomed in NO2 gas sensing applications, which provides new opportunities and challenges in function oriented gas sensors. In this work, a 2D/2D/2D structure of the Ti3C2Tx@TiO2@MoS2 composite was well designed via a facile one-step hydrothermal route, in which TiO2 nanosheets are in situ grown on ultrathin and highly conductive Ti3C2Tx MXene. Simultaneously, the few-layer and vertically oriented MoS2 nanoflakes rich in active edge-sites were uniformly distributed in the composite. Ti3C2Tx MXene and MoS2 act respectively as the electron reservoir and main sensitive material. The strong interfacial contact in different components facilitated the transfer of charge carriers and their spatial separation. Integrating the unique structural and electronic properties, the as-prepared Ti3C2Tx@TiO2@MoS2 sensor exhibited a remarkable gas sensing performance at room temperature (Ra/Rg = 55.16, 50 ppm NO2), which is 7.3, 3.8 and 2.1 times higher than that of pristine MoS2, TiO2@MoS2 and Ti3C2Tx@MoS2 composites, respectively. It also achieved ultrafast response time (1.8 s), more than 90% recoverability, low detection limit (23 ppb), dedicated selectivity and as long as eight-week stability.
研究领域:
材料科学
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传感器技术
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环境监测
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Bala Ismail Adamu,Attia Falak,Yi Tian,Xinghua Tan,Xiangmin Meng,Peipei Chen,Hanfu Wang,Weiguo Chu
High sensitivity, low limit of detection (LOD), and short response and recovery times at room temperature (RT) are critical for gas sensors. For NO2, different binary metal oxide-based sensors were developed to achieve superior performance at elevated temperatures instead of RT. Herein, we report on CuO@CuO and Cu3Mo2O9@CuO sensors with CuO and Cu3Mo2O9 micro/nanorods vertically aligned on the CuO layers, which were directly fabricated using a facile, low-cost, and catalyst-free chemical vapor deposition (CVD) technique. Their sensing performance tests revealed that the Cu3Mo2O9@CuO p–p heterojunction sensors exhibited a high response of 160% to 5 ppm NO2, an excellent sensitivity of 50% ppm–1, a low LOD of 2.30 ppb, a short response time of 49 s, and a rapid recovery of 241 s at RT, obviously better than those for CuO@CuO sensors. The superior performance of Cu3Mo2O9@CuO sensors could be attributed to the Schottky heterojunction formed between p-Cu3Mo2O9 micro/nanorods and p-CuO films, the catalytic effect, and the anisotropic nature of Cu3Mo2O9 micro/nanorods. This study not only provides a simple, low-cost, and batchable fabrication method of homo/heterojunction sensors with micro/nanorods vertically aligned on films but also opens an avenue for sensor design by tuning the Schottky barrier height to enhance RT performance.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Chao Wang,Ming Yang,Lihong Liu,Yingming Xu,Xianfa Zhang,Xiaoli Cheng,Shan Gao,Yuan Gao,Lihua Huo
In order to enhance the gas response of polypyrrole to NO 2 , the polypyrrole/Fe 2 O 3 nanocomposites are synthesized by one-step hydrothermal route. The presence of ferric oxide in composites is demonstrated by XPS, HRTEM and TG analyses. The polypyrrole/Fe 2 O 3 sensor exhibits high selectivity and response to NO 2 at 50 °C. Compared with other polypyrrole/metal oxide materials, the polypyrrole/Fe 2 O 3 materials are easy to be synthesized, and the gas sensor has a higher response of 220.7%, lower detection limit of 0.1 ppm and good linear relationship when the NO 2 concentrations range from 0.1 ppm to 10 ppm. The gas response is greatly improved in comparison with the pure polypyrrole and Fe 2 O 3 . The reason for the improved response is also discussed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Aimin Chen,Rui Liu,Xiao Peng,Qiaofen Chen,Jianmin Wu
In order to distinguish NO2 and SO2 gas with one sensor, we designed a paper chip assembled with a 2D g-C3N4/rGO stacking hybrid fabricated via a layer-by-layer self-assembly approach. The g-C3N4/rGO hybrid exhibited a remarkable photoelectric property due to the construction of a van der Waals heterostructure. For the first time, we have been able to selectively detect NO2 and SO2 gas using a “light on and off” strategy. Under the “light off” condition, the g-C3N4/rGO sensor exhibited a p-type semiconducting behavior with a low detection limit of 100 ppb of NO2, but with no response toward SO2. In contrast, the sensor showed n-type semiconducting behavior which could detect SO2 at concentration as low as 2 ppm under UV light irradiation. The effective electron transfer among the 2D structure of g-C3N4 and rGO nanosheets as well as highly porous structures could play an important role in gas sensing. The different sensing mechanisms at “light on and off” circumstances were also investigated in detail.
研究领域:
材料科学
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环境科学
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化学传感器
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DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
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2022
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IF 2.719
Lifeng Han,Yuheng Liu,Chaoqun Chang,Meng Liu,Zhikun Peng,Feilong Gong
We reported the design of cactus-like Mo-WO 3 nanoarchitecture assembled of 1D nanoneedles and 2D nanosheets for achieving a highly improved NO 2 sensing performance. The nanoneedles were vertically studding between the nanosheets forming a cactus-like WO 3 nanoarchitecture, leading to highly exposed absorption sites. Mo was introduced in the WO 3 nanoarchitecture to introduce oxygen vacancy, resulting in highly activated sites. The resultant 2%Mo-WO 3 delivered the sensitivity (Rg/Ra) of 285 to 10 ppm NO 2 , which was nearly three-times higher than that of pristine WO 3 . The recovery time was only 24 s, which was greatly decreased, compared with 172 s of pristine WO 3 .
研究领域:
材料科学
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纳米技术
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环境传感
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Bing-Rong Wang,Li-Ying Liu,Gen-Cai Guo,Yue-Jie Bai,Jin-Chun Tu,Ru-Zhi Wang
Cocatalysts have been extensively employed to improve gas sensing performance in gas detection. However, the interface effect of the heterojunction on gas sensing has rarely been addressed. This study investigated the interface effect of constructive hierarchical In 2 S 3 /In 2 O 3 nanoflowers on NO 2 gas sensitivity using a rapid and facile microwave-assisted hydrothermal method. The structure was then modulated from In 2 S 3 , to In 2 S 3 /In 2 O 3 heterostructures, and finally In 2 O 3 alone by increasing the calcination time. In 2 S 3 /In 2 O 3 heterostructures with an appropriate interface were found to significantly promote NO 2 gas sensitivity with a high gas-sensing selectivity compared with pure In 2 S 3 and In 2 O 3 . An interface enhancement model has also been developed. The strong interfacial coupling effect was key to high gas sensitivity, which likely originated from hole–electron pair separation through tuning of the interfacial electronic structure of In 2 S 3 /In 2 O 3 nanoflowers using different calcination times. This resulted in improved charge separation efficiency and carrier collection efficiency of electrons from In 2 S 3 to In 2 O 3 , and increased active sites. This boosted gas diffusion and adsorption, accelerated surface chemical reactions, and expedited charge transport and kinetic processes. This work provides a new approach for designing high-performance sensor using the interface effect of heterostructure nanomaterials.
研究领域:
材料科学
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传感器技术
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环境监测
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DOI
高影响因子
Frontiers in Chemistry
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2021
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IF 5.221
Wang Yingyi,Liu Lin,Sun Fuqin,Li Tie,Zhang Ting,Qin Sujie
This study reported a novel humidity-insensitive nitrogen dioxide (NO2) gas sensor based on tin dioxide (SnO2)/reduced graphene oxide (rGO) composites through the sol-gel method. The sensor demonstrated ppb-level NO2 detection in p-type sensing behaviors (13.6% response to 750 ppb). Because of the synergistic effect on SnO2/rGO p-n heterojunction, the sensing performance was greatly enhanced compared to that of bare rGO. The limit of detection of sensors was as low as 6.7 ppb under dry air. Moreover, benefited from the formed superhydrophobic structure of the SnO2/rGO composites (contact angle: 149.0°), the humidity showed a negligible influence on the dynamic response (Sg) of the sensor to different concentration of NO2 when increasing the relative humidity (RH) from 0 to 70% at 116°C. The relative conductivity of the sensor to 83% relative humidity was 0.11%. In addition, the response ratio (Sg/SRH) between 750 ppb NO2 and 83% RH was 649.0, indicating the negligible impaction of high-level ambient humidity on the sensor. The as-fabricated humidity-insensitive gas sensor can promise NO2 detection in real-world applications such as safety alarm, chemical engineering, and so on.
研究领域:
材料科学
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环境监测
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气体传感技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Tianyi Han,Shang Gao,Ziying Wang,Teng Fei,Sen Liu,Tong Zhang
A series of reduced graphene oxide (rGO) samples were prepared by hydrothermal reduction of graphene oxide (GO) samples, which were obtained by a modified Hummers’ method at oxidation temperatures of 65 °C, 75 °C, 85 °C, and 95 °C. The combined characterizations indicate that the number of C–O bonds in rGO samples increases with an increasing oxidation temperature of GO from 65 °C to 85 °C and then decreases when the temperature is further increased to 95 °C. Most importantly, the rGO obtained from the GO at an oxidation temperature of 85 °C (designated as rGO-85) exhibits a higher response to 5 ppm NO 2 (36.7%) at room temperature than the other three rGO samples, which is attributed to the high content of C–O bonds in the rGO-85 sample. This work suggests that the gas sensing properties of rGO-based sensors can be tuned by changing the number of oxygen-containing groups in rGO.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Hongtao Wang,Jihao Bai,Meng Dai,Kunpeng Liu,Yueying Liu,Linsheng Zhou,Fengmin Liu,Fangmeng Liu,Yuan Gao,Xu Yan,Lu Geyu
In this work, 2D/2D ZnO/g-C 3 N 4 heterojunction composite was synthesized through an ultrasonic mixing and subsequent calcination process. The gas-sensing performance to NO 2 was investigated at room temperature activated by visible/ultra-violet LED light sources. Noticeably, when ZnO/g-C 3 N 4 composite is illuminated by 460 nm light, it exhibits the highest response of 44.8 to 7 ppm NO 2 , and the response and recovery time is 142 and 190 s, respectively. Furthermore, it possesses excellent repeatability and selectivity to NO 2 , and the limit of detection is 38 ppb. In addition, the effect of humidity on the sensing performance under visible light was also investigated. The excellent gas-sensing performance is attributed to the absorbance of g-C 3 N 4 in the visible light region and the charge separation at the interface between ZnO and g-C 3 N 4 .
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhihua Zhao,Zijie Su,Chunhua Zheng,Guixin Jin,Lan Wu
Given the considerable harm that NO 2 poses to the environment and human health, developing reliable NO 2 detection sensors is crucial. Herein, a flexible, multifunctional sensor was successfully synthesized through hydrothermal and the wet impregnation methods using an elastic PU yarn as the substrate. This sensor, named Au/VTe 2 /Ti 3 C 2 T x –PU, was characterized via X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy to analyze its structure, chemical valence states, and micromorphology. At room temperature (23 °C), the sensor demonstrated an exceptionally high response to NO 2 gas, with a response value of 1.72 at 50 ppm as well as low response and recovery time of 33 and 38 s. Additionally, testing of the strain performance of Au/VTe 2 /Ti 3 C 2 T x –PU showed that this flexible sensor exhibits high strain sensitivity, excellent repeatability, and durability, making it suitable for detecting subtle human movements. Overall, the synthesized sensor is in considerable advantages in terms of both gas-sensing performance and tensile performance, exhibiting broad application prospects in human motion and health monitoring.
研究领域:
材料科学
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环境科学
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生物医学工程
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 6
·2615
·
IF 4.6
Anqi Cheng,Jinru Zhao,Xi-Ao Wang,Zhen Lu,Yan Qi,Jiankun Sun
To exploit high-performance and stable sensing materials with a room working temperature is pivotal for portable and mobile sensor devices. However, the common sensors based on metal oxide semiconductors usually need a higher working temperature (usually above 300 °C) to achieve a good response toward gas detection. Currently, metal halide perovskites have begun to rise as a promising candidate for gas monitoring at room temperature but suffer phase instability. Herein, we construct 1D/3D PyPbI3/FA0.83Cs0.17PbI3(denoted by PyPbI3/FACs) bilayer perovskite by post-processing spin-coating Pyrrolidinium hydroiodide (PyI) salt on top of 3D FACs film. Benefitting from the 1D PyPbI3coating layer, the phase stability of 1D/3D PyPbI3/FACs significantly improves. Simultaneously, the gas sensor based on the 1D/3D PyPbI3/FACs bilayer perovskite presents a superior selectivity and sensitivity toward NO2detection at room temperature, with a low detection limit of 220 ppb. Exposed to a 50 ± 3% relative humidity (RH) level environment for a consecutive six days, the 1D/3D PyPbI3/FACs perovskite-based sensor toward 10 ppm NO2can still maintain a rapid response with a slight attenuation. Gas sensors based on hybrid 1D/3D-structured perovskite in this work may provide a new pathway for highly sensitive and stable gas sensors in room working temperature, accelerating its practical application and portable device.Keywords:gas sensor;NO2detection;1D/3D hybrid-structured perovskite;room temperature;stability
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
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