SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Lingchu Huang,Weijia Li,Huaiyuan Sun,Jianyu Zhang,Bin Wang,Qi Lu,Tong Wang,Xishuang Liang,Fangmeng Liu,Peng Sun,Fengmin Liu,Geyu Lu
Expanding the application field of fuel cell type gas sensors is of great significance for achieving high sensitivity, real-time gas detection at room temperature. Here, we developed a fuel cell type NO 2 gas sensor based on MoS 2 nanosheet/Carbon fiber (CF) sensing electrode and Nafion proton conductor , enabling the fuel cell type sensor to detect NO 2 for the first time. The effect of MoS 2 loadings(10, 20, 40, 60 and 80 mg) on the sensors’ performance and the sensitizing mechanism are investigated, the sensor containing 40 mg MoS 2 exhibits the best performance, which can be attributed to the large number of active sites and efficient carrier transport properties of the corresponding electrode materials. At room temperature, the optimal sensor demonstrates a sensitivity of 45.6 nA/ppm to 1–50 ppm NO 2 and an ultra-low detection limit of 28.8 ppb, both the response and recovery time are less than 60 s. This work not only develops a highly sensitive, reversible and fast response NO 2 gas sensor, but also provides insights into sensing electrochemistry, material selection and catalyst/support materials, offering guidelines for future fuel cell type gas sensors to monitor a wider range of environmental pollutants.
研究领域:
材料科学
·
环境科学
·
电化学
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ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Hongxing Yang,Wangjin Yang,Shiwei Lai,Fu Li,Shaojie Yang,Chong Han
The role of NO 2 in the heterogeneous photochemical formation of sulfates by SO 2 uptake on typical brown carbon (BrC) species (Fluoranthene, FL; 4-(benzoyl) benzoic acid , 4–BBA; 3,7-dihydroxy-2-naphthoic acid, 3,7–DHNA) was systemically explored in a flow tube reactor with the infrared spectroscopy , ion chromatography as well as theoretical calculation. NO 2 enhanced SO 2 uptake and sulfate generation on BrC under irradiation, as shown by larger steady-state uptake coefficients of SO 2 and sulfate formation rates. NO 2 − can be produced through the reduction of NO 2 by the photogenerated electrons on BrC, and it was proven to be the trigger that promoted the oxidation of SO 2 to sulfates. NO 2 − was more easily formed on FL, followed by 4−BBA and 3,7−DHNA, which can be evidenced by the energy barrier for NO 2 − production: FL (0.01 kJ mol −1 ) < 4−BBA (0.12 kJ mol −1 ) < 3,7−DHNA (1.33 kJ mol −1 ). SO 2 lifetimes and sulfate formation rates during the reaction of SO 2 /NO 2 with BrC were estimated to be 10.60–31.75 days and 0.02–0.04 μg m −3 h −1 , respectively.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Jingxin Qi,Yu Chen,Yaru Liu,Runjia Xu,Kaifeng Xue,Lulu Du,Li Lv,Pinhua Zhang,Guangliang Cui
Bi-MOF-derived CuO/ZnO heterojunctions were made by ion exchange. • The sensor reaches 10 ppb detection and 5.08-fold higher response than ZnO. • It maintains a 6.38 response to 1 ppm NO 2 at −20 °C. • Quantitative NO 2 monitoring is demonstrated for precision agriculture. The development of miniaturized and portable NO 2 sensors for agricultural environments, capable of operating at low temperatures, is of great scientific significance and application value for improving nitrogen fertilizer utilization efficiency and preventing environmental pollution. ZnO/CuO heterostructures were prepared by employing bimetallic-based metal–organic frameworks (Bi-MOFs) as self-sacrificial templates for enhanced NO 2 sensing at room and lower temperatures in the field of precision agriculture applications. Our experiments reveal that the ZnO/CuO heterostructure calcined at 400 °C exhibits a response approximately 5.08 times that of pure ZnO. It delivers a response value of 7.78 toward 1 ppm NO 2 at 20 °C, with response and recovery times of 70 s and 150 s, respectively. Furthermore, it exhibits an excellent detection limit as low as 10 ppb toward NO 2 . Notably, even at − 20 °C, its response to 1 ppm NO 2 remains at 6.38. The excellent gas-sensing performance can be attributed to the synergistic contribution of the mesoporous structural advantages of MOF-derived MOS and heterostructures. This work provides promising research ideas and strategies for the application of Bi-MOF-derived MOS heterostructures in gas sensing. Download: Download high-res image (208KB) Download: Download full-size image
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ATMOSPHERIC ENVIRONMENT
·
2026
·
IF 3.8
Linlin Ye,Yan Huang,Linfeng Zhang,Panya Xu,Jingjing Wang,Chengzhu Zhu,Tong Zhu,Mingjin Wang
Model simulations indicate that atmospheric acidification increases the solubility of phosphorus (P) in mineral dust, thereby altering primary productivity in many P-limited ecosystems. However, results from laboratory simulation studies are still lacking. We investigated the heterogeneous reaction between nitrogen dioxide (NO 2 ) and hydroxyapatite (HAP) using a flow reaction system. The results reveal the formation of nitrate products and an increase in the water solubility of P in HAP. Under conditions of 50 ppm NO 2 and 50% relative humidity, after 8 h of reaction, the reactive uptake coefficients calculated using geometric surface area and Brunauer–Emmett–Teller surface area were 1.61 × 10 −5 and 1.26 × 10 −9 , respectively. After 10 h of reaction, the water solubility of P was 3.61 times its pre-reaction value. Longer reaction times and higher NO 2 concentrations promote both greater NO 3 − formation and increased P dissolution. The mechanism for increased water solubility involves hydrogen ions (H + ) weakening calcium bonds, thereby enhancing the release of P from the HAP crystal surface. This study demonstrates that atmospheric heterogeneous reactions between HAP in mineral dust and acidic gases can enhance the water solubility of P, thus increasing its bioavailability. This enhancement partially alleviates P limitation in tropical rainforests and open-ocean ecosystems, boosting primary productivity in P-limited ecosystems. Primary production processes absorb and fix atmospheric CO 2 , which in turn influences the carbon cycle in P-limited ecosystems.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Yingjie Li,Na Zhao,Yilin Chen,Jun Zhang,Xianghong Liu
For metal oxide semiconductor (MOS) gas sensors, achieving rapid and highly sensitive responses at room temperature (RT) remains a significant challenge. In this study, Ni-doped SnO 2 nanoparticles (NPs) were synthesized via a sol-gel method. The incorporation of nickel ions substantially enhanced the RT NO 2 sensing performance of SnO 2 . At an optimal doping concentration (5 at%), the SnO 2 NPs exhibited high sensitivity, excellent selectivity, and good stability, with a nearly 120-fold enhancement in sensor response. The excellent sensor performance can be attributed to the fact that when Ni 2 + enters the SnO 2 lattice and replaces Sn 4+ , it disrupts the defect balance in the SnO 2 lattice. The presence of Ni 2+ in the SnO 2 crystal captures free electrons in the sensitive material, forming oxygen ions and oxygen vacancies, which alters the defect balance of the gas-sensitive element and promotes the adsorption of NO 2 on the SnO 2 surface. This doping strategy effectively lowered the operating temperature of SnO 2 , enabling reliable NO 2 detection under RT conditions. Additionally, the experimental detection limit of the sensor reached as low as 100 ppb, far below the threshold of 200 ppb recommended by the American Conference of Governmental Industrial Hygienists (ACGIH). This work provides an effective sensitization strategy for developing RT gas sensors.
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Microsystems & Nanoengineering
·
2025
·Vol. 11
·期 1
·246
·
IF 9.9
Guo Chenfei,Liu Lin,Cai Zhengyang,Wang Yingyi,Guan Kejie,Sun Fuqin,Zhou Weifan,Gou Xiaoshuang,He Xiaoqian,Wang Xiaowei,Zhang Ting
Two-dimensional (2D) materials are intensively studied as promising materials for gas sensors owing to their large surface area and low working temperature. In this work, we report the synthesis of a layered SnS 2 single crystal by a chemical vapor deposition (CVD) approach for NO 2 sensing. By tuning the growth temperature, high-quality crystals with a lateral size over 3 mm are obtained in 30 min. The 2D SnS 2 sensor with optimized thickness (~15 nm) shows a low detection limit (2 ppb), a fast recovery time (66 s/1 ppm), and a high response (~4702% @ 1 ppm NO 2 ) at room temperature (RT) under UV illumination. An in-situ Kelvin probe force microscope is employed to reveal the high selectivity of SnS 2 through qualitative and semi-quantitative analysis of charge transfer behavior, including the directions and amount of charge transfer, upon exposure to different gases. In-situ Raman and first-principles density functional theory calculations further confirm the sensing mechanism toward NO 2 . Both experimental and theoretical results suggest that 2D SnS 2 holds promising potential as an RT NO₂ sensing material.
研究领域:
材料科学
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气体传感器
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纳米技术
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表面科学
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理论化学
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Rensong Guo,Yutong Han,Chen Su,Xinwei Chen,Min Zeng,Nantao Hu,Yanjie Su,Zhihua Zhou,Hao Wei,Zhi Yang
Semiconducting two-dimensional (2D) transition metal dichalcogenides (TMDs) are promising gas-sensing materials due to their large surface-to-volume ratio, layered structures, susceptible surfaces, and excellent conductivities. Herein, a simple and effective method has been developed to exfoliate tungsten diselenide (WSe 2 ) into few-layered nanosheets with N- methyl-2-pyrrolidone (NMP) as a dispersant. The gas sensor based on the as-synthesized WSe 2 nanosheets shows an extremely high response (50 ppb, 5.06) under a low detection concentration of nitrogen dioxide (NO 2 ) at room temperature (25 °C), which is much higher than many other reports for 2D TMDs-based gas sensors. Additionally, our sensor also exhibits a response of 11.01 to 10 ppm NO 2 , an excellent selectivity, and a reliable long-term stability within 8 weeks. It is expected that the outstanding performances of the gas sensors based on WSe 2 nanosheets reported in the present work will make WSe 2 a promising candidate for ultrasensitive NO 2 sensing applications.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
表面化学
·
环境监测
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DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Jingxin Qi,Runjia Xu,Yaru Liu,Kaifeng Xue,Lulu Du,Li Lv,Guangliang Cui,Pinhua Zhang
Developing miniaturized portable sensors for detecting NO2 at low temperatures in agricultural environments is crucial for enhancing nitrogen fertilizer utilization efficiency and preventing environmental pollution. This work successfully synthesized ZnO/MWCNT heterostructures using an in situ 2D electrodeposition method under direct current voltage, which demonstrated exceptional gas-sensing performance toward NO2 under both room and lower temperature conditions. The sensor demonstrates a 4-fold enhancement response to 10 ppm of NO2 compared to pristine ZnO sensors and exhibits a response of 98% to 1 ppm of NO2 at room temperature with a detection limit of 30 ppb. Even at −20 °C, it maintains a 5.1% response to 1 ppm of NO2. Notably, the unique nanosheet structure endows the heterostructure with reversible temperature sensing and high-temperature circuit-breaker characteristics, enabling the sensor to have the ability to alarm for temperatures above 50 °C. The incorporation of MWCNTs and the formation of the p–n heterojunction play a synergistic role in enhancing the gas-sensing performance. Moreover, we successfully detected NO2 emissions from nitrogen fertilizers using the ZnO/MWCNT heterostructure sensor, demonstrating its potential for integration with Internet of Things (IoT) technology to enable intelligent agricultural monitoring.
研究领域:
材料科学
·
环境传感
·
农业技术
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纳米技术
·
物联网（IoT）
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 7
·3029-3044
·
IF 3.3
Deng Renjie,Cui Haishuai,Liu Meilin,Ni Wenjin,Tian Yao,Liu Huajie
Different solid superacid sulfated zirconium dioxide (SO 4 2− /ZrO 2 ) samples were successfully prepared by conventional and ultrasonic-assisted chemical precipitation process, and then, they were characterized by X-ray diffraction, Fourier transform infrared, thermal gravimetric analyzer (TGA), nitrogen adsorption–desorption, ammonia temperature programmed desorption (NH 3 -TPD) and pyridine adsorbs Fourier transform infrared. The results of characterizations indicate that the sulfonic acid group is successfully introduced, and the acidity and surface area of sulfated sample can be increased by using ultrasonic method. Furthermore, this ultrasonic-assisted catalyst was used for the chlorobenzene nitration using nitrogen dioxide (NO 2 ) as nitrating agent. The catalyst shows excellent catalytic activity and reusability for the nitration of chlorobenzene giving high para -selectivity. In the optimal reaction conditions, the conversion of chlorobenzene can reach 85.2% with 88.5% selectivity to para- nitrochlorobenzene ( p -NCB). Furthermore, the reaction mechanism was proposed by combination of experimental results and theoretical calculations. The present work provides an easy-to-implement, mild and environmentally friendly approach for the efficient preparation of valuable p -NCB, which has extensive industrial application prospects. Graphical abstract
研究领域:
催化
·
有机化学
·
材料科学
·
化学合成
·
环境化学
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·Vol. 31
·期 8
·2099-2102
·
IF 3.839
Xin Yu,Ding Wang,Yuqiu Wang,Ji Yan,Xianying Wang
In this work, the two-dimensional MoS 2 film was prepared by sulfuring the molybdenum atomic layer on SiO 2 /Si substrate. The reaction temperature, heating rate, holding time and carrier gas flow rate were investigated comprehensively. The quality of MoS 2 film was characterized by optical microscopy, atomic force microscopy, Raman and photoluminescence spectroscopy. The characterization results showed that the optimum synthesis parameters were heating rate of 25 °C/min, reaction temperature of 750 °C, holding time of 30 min and carrier gas velocity of 100 sccm. The MoS 2 gas sensor was fabricated and its gas sensing performance was tested. The test results indicated that the sensor had a good response to both reducing gas (NH 3 ) and oxidizing gas (NO 2 ) at room temperature. The sensitivity to 100 ppm of NO 2 was 31.3%, and the response/recovery times were 4 s and 5 s, respectively. In addition, the limit of detection could be as low as 1 ppm. This work helps us to develop low power and integrable room temperature NO 2 sensors.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
环境监测
·
半导体物理
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高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Minjie Ni,Shuai Han,Zhiping Liang,Siwei Liu,Xiangzhao Zhang,Shahid Hussain,Mingsong Wang,Guanjun Qiao,Guiwu Liu
Realizing room-temperature detection to low concentrations of hazardous gases can not only contribute to the long-term stability and low power consumption of gas sensors, but also benefit the life and health of human being. In this work, we firstly fabricated mulberry-like Cu 2 O/CuO composites by one-pot hydrothermal method . The optimized Cu 2 O/CuO nanocomposite exhibits the outstanding room-temperature sensitivity to NO 2 , such as the higher response, shorter response & recovery time, and lower detection threshold. Specifically, the room-temperature responses (ΔR/Ra) arrive at 19.3%, 62.3%, 70.9% and 82.0% to 0.01, 0.1, 1 and 10 ppm NO 2 , and the response & recovery time are 58 and 250 s while employing 0.1 ppm NO 2 , respectively. Furthermore, the optimized Cu 2 O/CuO composite presents excellent selectivity and reproducibility, good long-term stability to NO 2 , and non-monotone humidity dependence of response. Specifically, the fluctuations of response are less than 1.5% to 0.1 – 1 ppm NO 2 after five cycles, and ∼2% and 3% to 0.1 and 0.5 ppm NO 2 for 30 consecutive days, respectively. Finally, the gas sensing mechanism is also proposed based on the microstructure and microchemistry of the optimized Cu 2 O/CuO composite, the redox reactions on the surface, and the formation of p-p heterojunction . This work provides a promising candidate material for room-temperature detection of NO 2 .
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 16
·2289
·
IF 5.3
Zhenyu Wang,Haizhen Ding,Xuefeng Liu,Jing Zhao
Semiconductor oxide gas sensors have important applications in environmental protection, domestic health, and other fields. Research has shown that designing the morphology of sensitive materials can effectively improve the sensing characteristics of sensors. In this paper, by controlling the solvothermal reaction time, a unique hexagonal flower-like structure of In2O3materials consisting of cuboid nanorods with a side length of 100–300 nm was prepared. The characterization results indicated that with the increase in reaction time, the materials exhibited significant morphological evolution. When the solvent heating time is 5 h, the flower-like structure is basically composed of hexagonal nanosheets with a thickness of several hundred nanometers and a side length of several micrometers. With the increase in reaction time, the apex angles of the nano sheets gradually become obtuse, and, finally, with the Ostwald ripening process, they become cuboid nanorods with side lengths of 100–300 nanometers, forming unique micro-flowers. Among them, the material prepared with a reaction time of 20 h has good sensing performance for NO2, exhibiting low operating temperature and detection limit, good selectivity, repeatability, and long-term stability, thus suggesting a good application prospect.Keywords:In2O3;micro-flowers;morphological evolution;NO2sensor;solvothermal
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高影响因子
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