SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yajie Zhang,Yi Li,Yadong Jiang,Zaihua Duan,Zhen Yuan,Bohao Liu,Qi Huang,Qiuni Zhao,Yajie Yang,Huiling Tai
Transition metal carbides/nitrides (MXenes) have shown great potential in room temperature (RT) gas sensors, but the self-stacking of MXene sheets limits their sensitivity and response/recovery speed. In addition, the poor selectivity of MXenes sensors caused by the conventional single sensing mechanism remains a challenge. Herein, a synergistic effect of charge transfer and interlayer swelling is proposed to comprehensively improve the gas sensing performance of the MXenes toward oxidizing NO 2 . To this end, a resistive gas sensor is prepared by combining the accordion-like V 2 CT x MXene and n-type SnS 2 nanoplates . The results reveal that the NO 2 sensitivity of the V 2 CT x /SnS 2 sensor is enhanced by 581.6 times compared to the pristine V 2 CT x sensor, while achieving ultrafast response and recovery speeds (4.8/4.7 s) at 25 °C under 51.9 % relative humidity. Furthermore, the V 2 CT x /SnS 2 sensor exhibits excellent selectivity (response ratio > 5) to NO 2 . The outstanding gas sensing performances can be attributed to the synergistic sensing of charge transfer and interlayer swelling, unique structure and more active sites. This work expands the gas sensing application of the V 2 CT x MXene and promotes the in-depth combination of multiple sensing mechanisms, opening an effective avenue for developing high-performance RT NO 2 sensors.
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
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2022
·
IF 6.888
Wei Huang,Xinyue Xiang,Luyue Jin,Yi He
Here, we report on using dark-field microscopy (DFM) as a simple and low-cost imaging platform to visually resolve the kinetics of single cuprous oxide (Cu2O) microparticles for NO2 removal in a real-time manner. Unexpectedly, we find that the redox reaction between Cu2O microparticles and NO2 is oscillating with the reaction time. Specifically, the oscillatory behavior of single Cu2O microparticles for NO2 reduction shows a large particle-to-particle variability, which is also dependent upon the NO2 pressure and Cu2O facets. A combined DFM imaging, spectroscopic, scanning electron microscopy, and density functional theory study uncovers that Cu2O is gradually transformed to copper nitrate hydroxide [Cu2(NO3)(OH)3], and this oscillatory reaction is attributed to the cyclic formation and structural collapse of Cu2(NO3)(OH)3. The present findings open an alternative avenue for probing structure–performance relationships, which are anticipated to benefit the creation of functional materials for air purification.
研究领域:
环境化学
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材料科学
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表面科学
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纳米技术
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大气污染控制
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Meiyu Yuan,Changxin Peng,Junjie Fu,Xuening Liu,Zihan Wang,Shiyu Xu,Sheng Cui
Accurate and convenient detection of nitrogen dioxide (NO 2 ) in the air, which is harmful to human health, is vital. However, it is difficult for many NO 2 detection devices to achieve high sensitivity at room temperature. In this work, we synthesized zeolite-imidazolate-frameworks-8 (ZIF-8) nanoparticles and zinc oxide/reduced graphene oxide (ZnO/rGO) aerogel by low-temperature synthesis and sol-gel method. The aerogel composite materials were investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM), Brunaue-Emmette-Teller (BET), and Raman spectroscopy . The gas-sensitive element prepared by the material with the mass ratio ZIF-8 to rGO is 5:1 possesses excellent selectivity and higher sensitivity (3.21) to 100 ppm NO 2 at room temperature. Reduced graphene oxide (rGO) provides more gas transmission and diffusion channels for improving sensitivity because of a three-dimensional porous structure. When NO 2 is exposed, electrons transfer into p-n heterostructure formed by rGO and ZnO composite to achieve the purpose of sense. In this study, the material preparation method is relatively simple and efficient, which is of profound significance to accurately detect the variation of NO 2 concentration in air at room temperature.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hongtao Wang,Yuanchao Xie,Yang Liu,Yaodan Zhang,Jianan Ma,Jiaqi Yang
The enhanced sensitivity and selectivity of NO 2 gas sensors are crucial for atmospheric environmental monitoring. In this study, a novel NO 2 gas sensor based on small-sized ZIF-8/In 2 O 3 core-shell nanocube has been developed through a simple solvothermal method along with in situ modification. The ZIF-8 coating significantly increased the specific surface area of the In 2 O 3 nanocubes from 60.64 m 2 /g to 140.84 m 2 /g, while also boosting the adsorption of oxygen ions on the surface. Gas-sensing tests revealed that the ZIF-8/In 2 O 3 composites exhibited a response of 56.3 to 1 ppm of NO 2 , with an exceptionally low detection limit of 1 ppb. Notably, the sensor demonstrated outstanding selectivity for NO 2 over other potential interfering gases. The remarkable NO 2 sensing performance of the ZIF-8/In 2 O 3 composites can be attributed to the grain boundary effects in the In 2 O 3 nanocubes (with side lengths of approximately 40–50 nm), as well as the sensitizing and filtering effects of the ZIF-8 layer. This work holds significant promise for the rapid detection of low-concentration NO 2 gases in various applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Huizhang Zhao,Jianhui Lv,Xiao Ma,Bin Huang,Lei Han,Xingyu Kang,Dong Wang,Hairui Fang
NO 2 concentration in soil surface is one of the important indicators affecting soil nitrogen cycle. Real-time detection of NO 2 is crucial to optimize the use of nitrogen fertilizer and improve efficiency, which is also a key means to prevent soil acidification and increase crop yield. However, the humidity conditions on the soil surface increase the challenge of real-time detection of NO 2 . Therefore, a composite material of tungsten oxide (WO 3 ) composite tin sulfide (SnS 2 ) with heterogeneous structure was synthesized by one-step hydrothermal method. The composite material is seen to exist in the form of nanosheets. At the optimal working temperature of 210℃, the response of the composite material (WO 3 /SnS 2 (3:10)) with a molar ratio of WO 3 to SnS 2 of 3:10–20 ppm NO 2 is 63.8. The excellent gas sensing performance is attributed to the composition of heterojunction and the increase of deficiency oxygen. In the relative humidity (RH) range of 20–98 %, the response of the WO 3 /SnS 2 (3:10) has a good linearity ( R 2 =0.995). Therefore, the humidity compensation is integrated into the convenient NO 2 detection equipment to ensure that the WO 3 /SnS 2 (3:10) sensor can detect NO 2 stably and accurately under different humidity conditions. The NO 2 real-time detection system uses the OLED to display the humidity value and NO 2 concentration value in real time on the soil surface, and the buzzer as an alarm device for exceeding the concentration threshold (2 ppm NO 2 ), which reminds staff of the need to take action to adjust crop management strategies to improve crop health.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 29
·5060-5069
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IF 3.545
Zishuo Li,Chengming Lou,Guanglu Lei,Guocai Lu,Hongyin Pan,Xianghong Liu,Jun Zhang
Metal oxide semiconductor heterostructures are promising for gas sensors due to their unique chemical and electronic properties at the heterointerface. In this work, a highly sensitive and selective gas sensor for the detection of nitrogen dioxide (NO2) is reported based on In2O3/ZnO heterogeneous nanospheres designed by atomic layer deposition (ALD). Their electronic properties at the In2O3/ZnO heterogeneous interface can be tuned by varying ZnO ALD cycles. Gas sensing tests show that ZnO ALD significantly improves the sensor performance of In2O3 nanospheres, rendering a response of 7.9 to 10 ppm NO2 even at room temperature (RT). The sensor based on In2O3/ZnO with 30 cycles of ZnO ALD delivers the best response of 139.9 to 10 ppm NO2 at an operating temperature of 180 °C, showing a nearly 6-fold enhancement over pristine In2O3. Meanwhile, the In2O3/ZnO sensor also exhibits a low limit of detection of 35 ppb, which allows for reliable detection of sub-ppm NO2. The excellent sensor performances are correlated to the modulation of electron depletion layers at the In2O3/ZnO heterointerface, which sheds some light on designing new materials via ALD for the detection of hazardous gas molecules.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
ChemNanoMat
·
2019
·Vol. 5
·期 11
·1408-1417
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IF 3.431
Qiqi Sun,Qi Liu,Lei Gong,Chiming Wang,Xia Kong,Chaoyi Yang,Weigang Feng,Dongdong Qi,Fangna Dai,Xiyou Li,Yanli Chen
Graphical Moisture-resistant : Remarkably specific sensors for NO 2 have been developed based on hierarchical self-assembly of porphyrin devices. They are effective sensors over a broad humidity range. A metal free meso -tetrakis(1-pyrenyl)porphyrin H 2 T[(Pyr) 4 ]P ( 1 ) and its cobalt congener CoT[(Pyr) 4 ]P ( 2 ) are firstly fabricated into the hierarchical nanopetals and micro-ball-flowers, respectively, by a simple solution-based method. Unexpectedly highly sensitive, stable, selective and reproducible responses to 50–400 ppb NO 2 gas are obtained at room temperature for the aggregates of both 1 and 2 , within 2 min dynamic exposure period at a broad relative humidity (RH) range of 0%-75%. In particular, the micro-ball-flowers of 2 achieve a sensitivity of 91.4 and 214% ppm −1 at 45% RH and 75% RH, respectively, demonstrating the potentials as chemical sensors operating in real-world atmospheres. Furthermore, the sensitivity of 1 and 2 remains almost unchanged under 0%–75% RH after 6 months. The present work represents one of the best results among organic-based ppb-level NO 2 sensors operating under a broad RH range in terms of sensitivity and stability to humidity variations at room temperature.
研究领域:
材料科学
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化学传感
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 5
·917
·
IF 5.3
Donglin Li,Junfeng Lu,Xuanji Zhang,Dingfeng Jin,Hongxiao Jin
Nanoscale heterostructured zinc oxide/reduced graphene oxide (ZnO/rGO) materials with p–n heterojunctions exhibit excellent low temperature NO2gas sensing performance, but their doping ratio modulated sensing properties remain poorly understood. Herein, ZnO nanoparticles were loaded with 0.1~4% rGO by a facile hydrothermal method and evaluated as NO2gas chemiresistor. We have the following key findings. First, ZnO/rGO manifests doping ratio-dependent sensing type switching. Increasing the rGO concentration changes the type of ZnO/rGO conductivity from n-type (<0.6% rGO) to mixed n/p -type (0.6~1.4% rGO) and finally to p-type (>1.4% rGO). Second, interestingly, different sensing regions exhibit different sensing characteristics. In the n-type NO2gas sensing region, all the sensors exhibit the maximum gas response at the optimum working temperature. Among them, the sensor that shows the maximum gas response exhibits a minimum optimum working temperature. In the mixed n/p-type region, the material displays abnormal reversal from n- to p-type sensing transitions as a function of the doping ratio, NO2concentration and working temperature. In the p-type gas sensing region, the response decreases with increasing rGO ratio and working temperature. Third, we derive a conduction path model that shows how the sensing type switches in ZnO/rGO. We also find that p–n heterojunction ratio (np–n/nrGO) plays a key role in the optimal response condition. The model is supported by UV-vis experimental data. The approach presented in this work can be extended to other p–n heterostructures and the insights will benefit the design of more efficient chemiresistive gas sensors.Keywords:p–n junctions;ZnO;reduced graphene oxide;rGO;NO2sensing
研究领域:
材料科学
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传感器技术
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纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yumeng Liu,Jinniu Zhang,Gang Li,Jia Liu,Qingfei Liang,Hongjun Wang,Yuanyuan Zhu,Jianzhi Gao,Hongbing Lu
In 2 O 3 –ZnO nanotubes were prepared by a solvent thermal method using electrospun indium nitrate–polyvinyl pyrrolidone [In(NO 3 ) 3 –PVP] nanofibers as a sacrificial template. The sensing properties toward NO 2 of this kind of new emerging sensing material were explored. Compared with as-electrospun In 2 O 3 nanofibers, the In 2 O 3 –ZnO composite nanotubes exhibited higher responses and better selectivity to NO 2 . The response of the In 2 O 3 –ZnO nanotubes to 500 ppb NO 2 at room temperature (RT, 25 °C) under UV irradiation was as high as to 32.73, which was 3.33 times higher than that of the In 2 O 3 nanofibers. Moreover, even under a high relative humidity of 80%, the RT NO 2 response of the In 2 O 3 –ZnO composite nanotubes can still reach up to 3.50–500 ppb. The enhanced NO 2 sensing characteristics were mainly ascribed to the formation of In 2 O 3 –ZnO n–n heterojunctions , the enhanced light absorption, and the increased oxygen vacancy proportion. The results suggested that In 2 O 3 –ZnO nanotubes had good potential for the selective and sensitive detection of ppb-level NO 2 at RT.
研究领域:
材料科学
·
环境监测
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Bing Song,Lixue Qi,Hongyi Wu,Yan Tong,Li Li,Muhammad Ikram,Keying Shi
The solvothermal and wet chemical method was developed to synthesized the p-n heterostructures of the thin porous Co 3 O 4 nanosheets with ZnO nanoparticles. The resulting products were analyzed by using various characterization techniques. The results possessed that the presence of a large number of oxygen defects on the surface of Co 3 O 4 -ZnO-7 favors enhancing the NO 2 adsorption. Correspondingly, the formation of p-n heterojunction and the large surface area of the material itself increased the carrier density and exposed more active sites, which collectively boost the sensing performance to NO 2 . The sensor showed a high response of 45.7 (S = R a /R g ) to 100 ppm NO 2 at room temperature (RT = 25 °C), with a short response/recovery time (1.3/25 s), and the lower detection limit of the sensor reached 30 ppb, with good selectivity, reproducibility and stability. This study will offer the opportunity to develop new sensors with high response and fast response-recovery to NO 2 at room temperature.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 41
·期 11
·8307-8315
·
IF 1.221
You Kuiyi,Zhou Zhongcang,Jian Jian,Deng Renjie,Liu Pingle,Ai Qiuhong,Luo He’an
A simple method for the preparation of dinitronaphthalene from the nitration reaction of 1-nitronaphthalene with NO 2 as nitration reagent under the mild conditions has been successfully developed in this work. The results indicated that Ni(CH 3 COO) 2 ·4H 2 O catalyst shows better catalytic performances, and the conversion of 1-nitronaphthalene is 33.10 % with 34.10, 23.56, 19.30, and 3.56 % of the selectivity to 1,5-DNN, 1,3-DNN, 1,4-DNN, and 1,8-DNN, respectively, under the optimal reaction conditions. This is a mild, environmentally benign, and economical method for the preparation of dinitronaphthalene.
研究领域:
化学
·
环境科学
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 4
·964-972
·
IF 7.2
Han Dan,Liu Xiaoru,Li Donghui,Shi Jiexu,Wang Yu,Wang Yuxuan,Wang Hongtao,Sang Shengbo
In this work, we realized a room-temperature nitrogen dioxide (NO 2 ) gas sensor based on a platinum (Pt)-loaded nanoporous gallium nitride (NP-GaN) sensing material using the thermal reduction method and coreduction with the catalysis of polyols. The gas sensor gained excellent sensitivity to NO 2 at a concentration range of 200 ppm to 100 ppb, benefiting from the loading of Pt nanoparticles, and exhibited a short response time (22 s) and recovery time (170 s) to 100 ppm of NO 2 at room temperature with excellent selectivity to NO 2 compared with other gases. This phenomenon was attributed to the spillover effect and the synergic electronic interaction with semiconductor materials of Pt, which not only provided more electrons for the adsorption of NO 2 molecules but also occupied effective sites, causing poor sites for other gases. The low detection limit of Pt/NP-GaN was 100 ppb, and the gas sensor still had a fast response 70 d after fabrication. Besides, the gas-sensing mechanism of the gas sensor was further elaborated to determine the reason leading to its improved properties. The significant spillover impact and oxygen dissociation of Pt provided advantages to its synergic electronic interaction with semiconductor materials, leading to the improvement of the gas properties of gas sensors.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）