APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Huishuang Jiang,Yang Qu,Xianfa Zhang,Rui Gao,Xiaoli Cheng,Shan Gao,Lihua Huo,Zolt́an Major,Yingming Xu
As a poisonous and harmful gas, NO 2 , is not only harmful to the environment, but also detrimental to human health. In this work, ionic liquids (1-hexadecyl-3-methylimidazolium chloride [C 16 Mim] Cl) were selected as dopants to prepare flower-like Cl uniform doped In 2 O 3 nanomaterials. The material exhibits excellent sensing performance to NO 2 under UV light because of Cl uniform doped. Compared with the experiment in dark conditions, the response value of the sensor to 5 ppm NO 2 under UV light is approximately two times higher (S = 425.9) and presents a faster recovery rate (69 s). Chlorine doping shifts the valence band of the material upwards, facilitating the photogenerated electron leap under UV illumination. Moreover, the in-situ DRIFT under UV light were employed to verify the interaction between the materials and NO 2 gas in N 2 , air and O 2 atmospheres respectively. It was found that the presence of oxygen in the environment affects the adsorption of NO 2 on the surface of the Cl doped In 2 O 3 material. This work is of great significance to the sensing mechanism investigation of photo-activated NO 2 gas sensors.
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 A-PHYSICAL
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2025
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IF 4.9
Yi Zhong,Zhihua Ying,Yan Liu,Chenhan Zhang,Wenjun Yan,Yuan Jiang
Conventional metal oxide semiconductor gas sensors are inherently limited by their dependence on high operating temperatures (200–400℃), which leads to increased energy consumption and reduced long-term device stability. To overcome these challenges, this study presents a glycine-assisted solvent evaporation synthesis route for the preparation of highly dispersible WO 3 nanoparticles. Glycine acts dually as a crystallographic modulator during nanoparticle growth and as an interfacial stabilizer, allowing for control over both particle size and oxygen vacancy concentration. Subsequent annealing removes residual glycine while preserving the optimized nanostructure. The optimized 6-WO 3 sensor synthesized using 6 mmol glycine exhibits remarkable low-temperature sensing performance, demonstrating a response value of 270.9 toward 3 ppm NO 2 at a reduced operating temperature of 120°C compared to conventional WO 3 -based counterparts while maintaining high sensitivity. Systematic characterization links this energy-efficient performance to synergistic effects between enhanced gas diffusion pathways, evidenced by a BET surface area of 20.59 m 2 /g, and precise modulation of electron depletion layers via glycine-mediated oxygen vacancy engineering. This work advances a practical paradigm for designing metal oxide semiconductor sensors that harmonize high sensitivity with operational sustainability, highlighting their transformative potential in next-generation environmental monitoring systems.
研究领域:
材料科学
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环境科学
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传感器技术
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
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IF 5.3
Chong Li,Ran Tao,Jianlei Zhang,Jinlong Chen,Chen Fu,Jikai Zhang,Huiling Ong,Chenze Lu,Yi Chen,Qiang Wu,Jing-Ting Luo,Yongqing Fu
Along with the revolution of the Internet of Things (IoT), smart, flexible, easily fabricated, and highly sensitive gas sensors are essential for many portable electronics. In this study, a wearable NO2 sensor based on a nanomesh structure woven with Ti3C2Tx microflakes and Bi2S3 nanobelts operated at room temperature was successfully designed and prepared. The effects of the mass ratio between two materials on the performance were evaluated. Bi2S3 nanobelts embedded inside accordion-like Ti3C2Tx provide large specific surface areas and abundant active sites for the adsorption of NO2 molecules. Attributed to the high conductivity of Ti3C2Tx, the carriers generated in the sensitive layers are easily transmitted during sensing, thus significantly reducing the response and recovery times. The sensor based on the nanomesh containing 30 wt % Ti3C2Tx exhibits excellent sensing performance, fast response/recovery rates, and high stability even in arbitrary deformed shape conditions. Upon exposure to 1 ppm NO2, the response of the sensor is 12.67, and the response/recovery times are 5/28 s, respectively. A stable sensing performance can be maintained after 1500 cycles of deformation. This work demonstrates a simple but reliable manufacturing strategy of wearable gas sensors for the next generation of IoT monitoring network-linking human activities.
研究领域:
材料科学
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传感器技术
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物联网应用
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Zhi Liu,Chong Chen,Jinchong Zhao,Lingzhi Yang,Kaian Sun,Lingyou Zeng,Yuan Pan,Yunqi Liu,Chenguang Liu
Selective catalytic reduction of NO by NH 3 (SCR) at low temperature usually considered to be the combination of NO oxidation and “Fast SCR” process. However, the NO oxidation mechanism and the role of NO 2 over “Fast SCR” process are controversial. Focusing on these problems, the in-deep studies were performed over the typical MnO x /TiO 2 catalysts. Combining in-situ DRIFT, TPD-MS and DFT calculation results, an integrated NO oxidation mechanism was proposed based on an “Nitro-assisted oxygen activation” concept where the activation and transformation of O 2 is linked with the transformation of nitro species. The O O bond of O 2 can be weakened by generating a variation of bidentate nitrates, which can promote the break of O O bond and the formation of NO 2 . The formation of the variation of bidentate nitrates was the rate-determining step over NO oxidation. Additionally, we further reveal that the crucial role of NO 2 over “Fast SCR” process lies in participating the hydrogen abstraction from coordinated NH 3 and promoting the production of NH 2 active species which can direct react with NO to generate N 2 and H 2 O. The removability of NO 2 can coupling the MnO 2 (NO oxidation active component) and TiO 2 support (“Fast SCR” active component) together. Our findings provide insight into the design and improvement of catalysts or reaction pathways over the low-temperature SCR process.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhen Lu,Chengming Lou,Anqi Cheng,Jun Zhang,Jiankun Sun
Nitrogen dioxide (NO 2 ), as a common air contaminant, can cause human asthma and other respiratory diseases under a ppm-level atmosphere. Currently, most metal oxide semiconductors sensors usually work at a high temperature, which hinders its practical application. Therefore, to develop an efficient sensor with good stability and sensitivity is urgent for NO 2 detection at room temperature. Herein, we report a FA 0.83 Cs 0.17 PbI 3 (FACs)-based perovskite sensor via a simple one-step spin-coating method under ambient atmosphere. The FACs-based sensor exhibits a sensitive response to NO 2 gas, low detection limit of 0.14 ppm and good reversibility as well as selectivity. The response/recovery time for the detection of 10 ppm NO 2 is only 2/22 s, which surpasses the vast majority of sensors. Moreover, the FACs-based sensor also displays excellent stability. No morphological and structural changes occur, when FACs film is successively placed in a high-humidity air (50–60 %) without any encapsulations for three consecutive days. Benefitting from the superior response and stability, the FACs-based sensor in this work may open up a new avenue for high-performance sensor for the practical detection of NO 2 at room temperature.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
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2023
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IF 11.1
Di Zhang,Hao Tang,Bing Zhao,Lijie Liu,Hongwei Pang,Xiangxue Wang,Shujun Yu
Radioactive uranium removal plays a key role in energy development and environmental security. Sulfide nanoscale zero-valent iron (S-NZVI) has good antioxidant capacity, dispersibility and activity to eliminate U(VI) from wastewater, but the removal efficiency is limited. To improve the reduction and adsorption capacity of S-NZVI, through treating Fe 3+ solution by nitro-functionalized UiO-66 (UiO-66-NO 2 ) with high porosity, UiO-66-NO 2 enhanced S-NZVI adsorbent (S-NZVI/UiO-66) was prepared by liquid phase reduction method. The smaller size and larger specific surface area of S-NZVI/UiO-66 were confirmed by a variety of characterization techniques. Based on the excellent surface structure and reactivity, the U(VI) removal capacity of S-NZVI/UiO-66 (895 mg g −1 ) was much better than S-NZVI (434 mg g −1 ) and UiO-66-NO 2 (267 mg g −1 ). The impacts of pH, background ion strength, coexisting ions and different water environments on adsorption were studied via macroscopic batch experiments. The results showed that S-NZVI/UiO-66 could remove U(VI) adequately in a wide pH range. The removal rate was basically not affected by the concentration of NaNO 3 , demonstrating that the adsorption process of U(VI) on S-NZVI/UiO-66 tended to inner surface complexation. From XPS technique combined with the results of batch adsorption experiments, it was clear that the elimination mechanisms of U(VI) by S-NZVI/UiO-66 were mainly the physical adsorption, electrostatic attraction and complexation of UiO-66-NO 2 , and the reduction and complexation of S-NZVI. Therefore, it is believed that S-NZVI/UiO-66 has a great potential to be an excellent adsorbent in the field of the environment remediation. Moreover, S-NZVI/UiO-66 promises to be a novel nanomaterial for solving the problem of radionuclide contamination in practical environments.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 7
·期 1
·1901579
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IF 4.713
Yangyang Zhu,Qiang Xie,Yang Sun,Lu Wang,Qiang Sun,Lijuan Wang
Gas sensors based on different interface layers are prepared by vacuum evaporation method. In comparison with the microscope images of films on different interface layer, zinc phthalocyanine (ZnPc) films exhibit good continuity on the heterogeneous interface of p -sexiphenyl/α-sexithiophene ( p -6P/α-6T). Under the optimal conditions of ZnPc films, ZnPc film sensors with high performance are obtained based on ultrathin heterogenous interface layers. The responsivity is up to 2271% at 3 ppm NO 2 gas and the sensitivity is 570% ppm −1 . The minimum detection limit of sensors is lower than 500 ppb and the responsivity is 157% to 500 ppb NO 2 gas. The high performance of sensors is attributed to the ultrathin heterogeneous interface layer. The island-like p -6P domains at the bottom provide the precursor for the growth of α-6T layer while the α-6T molecules fill the interval of p -6P islands, as a result, a continuous interface for the growth of ZnPc molecules came into being. In addition, the ZnPc and α-6T films have high electrical characteristics. The results are favorable for the adsorption and desorption of NO 2 gas molecules. The ultrathin heterogeneous interface layer provides a feasible research evidence for the further research and development of ultrathin and flexible electronic devices.
研究领域:
材料科学
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电子工程
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环境监测
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2020
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IF 3.83
Jian Ding,Shuqun Chen,Ning Han,Yi Shi,Peng Hu,Hongyi Li,Jinshu Wang
Gas response control through structural and defect engineering in metal oxides are critical approaches to realize high performance sensors. Herein, we present the fabrication of ZnO thin films containing nanosized structures and high concentration of zinc interstitials for NO 2 and ethanol monitoring. The target materials were fabricated by aerosol assisted chemical vapour deposition (AACVD) method on ceramic and glass substrates, and were characterized by complementary analytical techniques. The obtained ZnO nanoparticulate and nanopyramidal thin films yielded an outstanding response of ~41 to 1 ppm NO 2 and ~236 towards 100 ppm ethanol, respectively. The reasons accounting for such an enhancement were revealed by the surface-depletion model in ZnO and the chemisorption energies of oxygen molecules on Zn i -enriched crystal facets.
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
高影响因子
Frontiers in Chemistry
·
2020
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IF 3.693
Wu Yi,Yan Meng,Tian Chen,Liu Yuhang,Hua Zhongqiu
Gas sensors were fabricated from Cr2WO6 nanoparticles for NO2 detection. Low dimensional materials Cr2WO6 were prepared by a wet chemistry method followed by hydrothermal treatment. The morphology of the nanoparticles and their sensing properties to NO2 were investigated in both dry and humid conditions. Additionally, the sensing response was also characterized in a non-oxygen condition. It was concluded that the sensor responses in N2 conditions were higher than that in air conditions at 200°C. Moreover, the sensing characteristics were inhibited by water vapor at 200°C. The oxygen adsorption behavior was also investigated to verify the basic sensing mechanism of Cr2WO6 in the absence and presence of NO2 and water vapor separately. Based on the power law response, it was indicated that both NO2 and water vapor have a strong adsorption ability than oxygen ions of Cr2WO6 sensors.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zhidong Jin,Jinbo Zhao,Chuanzhi Chen,Huan Zhou,Nan Xiang,Fei Liu,Lin Liu,Jiurong Liu,Yue Mou,Lili Wu
Constructing heterojunctions in semiconductor-based sensors is a vital method of modulating electronic structures and designing high-performance sensors for toxic gas detection. In this study, F-doped SnS x (F-SnS x ) decorated ZnOHF composites were acquired via a two-step solvothermal method . The experimental results confirmed the establishment of heterojunctions between ZnOHF and F-SnS x . The optimized F-SnS x decorated ZnOHF snowflake-like nanoflowers-based NO 2 sensors exhibited incomparable selectivity along with supreme sensitivity (S = 137–10 ppm NO 2 at 200 ℃), rapid responding/recovering speed (34 s/6 s) and low detection limit (50 ppb). NO 2 sensing mechanism and the influence of humidity interference on NO 2 sensing performances were fully discussed. This work not only evidences the great potential of F-SnS x /ZnOHF snowflake-like nanoflowers for NO 2 recognitions but also paves a feasible routine for advancing NO 2 sensing performances by electronic structure regulations.
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
Atmosphere
·
2022
·Vol. 13
·期 2
·333
·
IF 3.11
Chao Wang,Lingdong Kong,Shengyan Jin,Lianghai Xia,Jie Tan,Yuwen Wang
Soot and aged soot are often found to be mixed with atmospheric particles, which inevitably affect various atmospheric heterogeneous reactions and secondary aerosol formation. Previous studies have investigated the heterogeneous reaction of NO2with different types of soot, but there are few studies on the heterogeneous reaction of NO2with mixtures containing diesel soot (DS) or aged DS and mineral dust particles. In this study, the effects of DS and aged DS on the heterogeneous reaction of NO2on the surface of γ-Al2O3were investigated via in-situ diffuse reflectance infrared Fourier transform spectrometry (DRIFTS). The results showed that the DS or DS n-hexane extract significantly inhibited the formation of nitrate on γ-Al2O3particles and promoted the formation of nitrite. At 58% RH, with the increase of DS or DS n-hexane extract loading amount, the effect of DS or DS n-hexane extract on the formation of nitrate changed from promotion to inhibition, but DS or DS n-hexane extract always promoted the formation of nitrite. The results also showed that light was conducive to the formation of nitrate on the DS-γ-Al2O3or DS-n-hexane extract-γ-Al2O3particles. Furthermore, the influence of soot aging on the heterogeneous reaction of NO2was investigated under light and no light. In the dark, O3-aged DS-γ-Al2O3or O3-aged DS-n-hexane extract-γ-Al2O3firstly inhibited the formation of nitrate on the mixed particles and then promoted it, while the effect of aged DS on nitrite formation was complex. Under light, the O3-aged DS-γ-Al2O3firstly promoted the formation of nitrate on the mixed particles and then inhibited it, while the O3-aged DS-n-hexane extract-γ-Al2O3promoted the formation of nitrate on the mixed particles. Our results further showed that the production of nitrate on the O3-aged particles under light or no light was greater than that of the UV-nitrate-aged particles. This study is helpful to deeply understand the atmospheric chemical behavior of soot and the heterogeneous conversion of atmospheric NO2.Keywords:soot;NO2;heterogeneous reaction;aged soot;γ-Al2O3
研究领域:
大气化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yue-Jie Bai,Li-Ying Liu,Xun-Kai Duan,Guang-Xuan Zhang,Chao Wang,Xin-Yu Zhou,Changhao Wang,Bing-Rong Wang,Xiao-Lin Wei,Ru-zhi Wang
To further develop sensing materials for NO 2 gas detection practical application, the operating temperature of the sensor should be significantly reduced. In this paper, In 2 O 3 flowers were prepared by the microwave-assisted hydrothermal method . Then, In 2 O 3 was doped using TAA (thioacetamide). The prepared S-doped In 2 O 3 flowers have good gas sensitivity and significantly reduced operating temperature. When exposed to 10 ppm NO 2 gas, the corresponding response was 250 at 118 °C. It can be demonstrated by the first principle calculations, in which the doping of S atoms changes the electron structure of In 2 O 3 from semiconductor to metal with a lower potential barrier. Then, significantly affects the electron crossing the intergranular potential barriers. Therefore, the operating temperature of the sensor can be reduced. Our research results will provide new research ideas and technical approaches for designing, fabricating, and applying a new generation of In 2 O 3 gas sensors.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
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